Relevant bibliographies by topics / Hydroponics

Academic literature on the topic 'Hydroponics'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Hydroponics"

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Alif Hadi Ariansyah, Fathra Annis Nauli, and Jenni Nurika Wisyana Nasution. "Pemberdayaan Lingkungan Masyarakat Melalui Sosialisasi Hidroponik System Wick (Sumbu) Di Desa Gading Permai Kec. Kampar Kiri Hilir, Kab. Kampar, Riau." JURNAL PENGABDIAN MASYARAKAT INDONESIA 2, no. 3 (September 15, 2023): 189–96. http://dx.doi.org/10.55606/jpmi.v2i3.2558.

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The socialization of hydroponics to the village community is an effort to develop the independence and welfare of the community by improving knowledge, attitudes, skills, Hydroponics is a cultivati Wick hydroponics is a simple hydroponic method that uses a wick as a link between nutrients and the roots of the growing media. This activity was carried out in Gading Permai Village, Kampar Kiri Hilir District, Kampar, Riau. This activity began with a theoretical and practical explanation with pakcoy mustard plants as an example, the practice carried out starting from seed sowing, wick system hydroponic installation, transplanting and continued with a discussion session. The results of this activity are that the Gading Permai village community knows hydroponics in general, wick system hydroponics, hydroponic plant maintenance, handing over hydroponics to the Gading Permai village community so that they can continue to care for and continue hydroponic cultivation. This activity adds to the knowledge and insight of the Gading Permai village community about hydroponics and can spread and teach the knowledge that has been given to fellow communities.
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Mailani, Fitri, Eli Ratni, Danny Hidayat, Mulyanti Roberto Muliantino, Risti Kurnia Dewi, and Virtous Setyaka. "Pendampingan Pemanfaatan Digital Branding dan Digital Marketing pada We Farm Hidroponik untuk Menuju Kawasan Agroeduwisata." Jurnal Warta Pengabdian Andalas 30, no. 1 (March 20, 2023): 136–43. http://dx.doi.org/10.25077/jwa.30.1.136-143.2023.

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"We Farm Hydroponics" is an agricultural business implementing a hydroponic system with the motto healthy vegetables and free of pesticides. The need for good business branding and proper digital marketing in advancing the "We Farm Hydroponic" business, especially in the field of marketing, so that it can be a solution to meet market needs and is well known by the public. The purpose of this activity is to provide assistance to partners in building business profiles/branding and digital marketing and to make "We Farm Hydroponics" a hydroponic agro-education area in West Sumatra; assistance to partners is carried out for three months starting from October to December 2022 with the method of mentoring, coaching, and development. The activities carried out were FGDs for the development of a hydroponic We Farm business into an agrotourism area, assistance in managing the legality of the "We Farm Hydroponics" business, namely the business registration number (NIB), fostering the development of the "We Farm Hydroponics" business to become an agrotourism area through strengthening branding/business profile. Assistance in optimizing promotions through digital marketing, training in maintaining the greenhouse area "We Farm Hydroponics," and training in hydroponic vegetable nutrition to improve the quality and quantity of hydroponic vegetable crops as well as training in making healthy food products made from hydroponic vegetables (vegetable juice and smoothies). This activity impacts increasing agrotourism visits to We Farm Hydroponics and increasing insight into We Farm Hydroponics' social media.
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Mahyudi, Fitri, and Husinsyah. "ANALISIS KELAYAKAN USAHA SAYURAN HIDROPONIK DI KOTA BANJARBARU KALIMANTAN SELATAN." Chlorophyl 17, no. 1 (June 19, 2024): 141–48. http://dx.doi.org/10.57216/chlorophyl.v17i1.787.

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Hydroponics comes from two Greek syllables, namely hydro which means water and ponos which means power. The definition of hydroponics is cultivating plants without using a planting medium in the form of soil which is replaced with water and other media are added such as gravel, sand or white cork. Based on the background and problem formulation that has been put forward, the aim of this research is to analyze the feasibility of the hydroponic business. Hydroponik farmer Banjarbaru based on non-financial aspects and analyzing the feasibility of the hydroponics business. Hydroponik farmer based on financial aspects. This research was conducted in Landasan Ulin District, Banjarbaru City, South Kalimantan Province. This research was chosen purposively for the reason that Banjarbaru City, especially Landasan Ulin District, has many hydroponic businesses. Research data collection was carried out from May 2024 to June 2024. After that, an analysis was carried out regarding financial aspects consisting of costs and income along with profits. Hydroponik farmer is analyzed using ROI (Return on Investment), NPV (Net Present Value), IRR (Internal Rate of Return), Net B/C ratio, PP (Payback Period), and BEP (Break Event Point). Based on the results of the analysis and discussion, this research is concluded as follows: From a non-financial aspect, Hidroponik FarmerBanjarbaru has been said to be feasible to run, provided that environmental aspects must be improved. Handling of production waste must be managed better, not just piled up at the back of the garden. From a financial aspect, Hydroponik farmer has been said to be feasible to run because it has an ROI value of 24.17%, an NPV of Rp. 79,557,052, IRR of 18.36 %, Net B/C ratio of 1.78, Payback Period of 6 years, 1 months, 16 days, BEP price of Rp. 14,557.60 per kilogram and production BEP of 4.571 per year
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Anita, Anita. "Budidaya Hidroponik Posyandu Mawar Desa Palioi Kecamatan Kindang Kabupaten Bulukumba." Jurnal Nasional Pengabdian Masyarakat 1, no. 1 (December 19, 2020): 1–8. http://dx.doi.org/10.47747/pengabdiankepadamasyarakat.v1i1.117.

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Posyandu (Integrated Service Post) is a form of community self-help activity in the health sector whose existence is expected to bring promotive and preventive efforts closer to the community. Based on the output of the survey conducted at Posyandu Mawar, located in Palioi Village, Kindang District, Bulukumba Regency, it was found that there is still minimal use of posyandu land for vegetable cultivation. One method solution to solving the problem of Posyandu Mawar cadres is conducting hydroponic training. Hydroponics is the cultivation of planting using water without using soil but emphasizes more on meeting nutritional needs for plants. The method used uses interactive lecturing techniques using power point media. The materials provided are: (a) Definition of Hydroponics, (b) Excess Hydroponics, (c) Procurement of Hydroponic planting media, (d) Types of Hydroponic Plants, (e) Maintenance of Hydroponic Plants, (f) Hydroponic Harvesting. Training activities and practice of making hydroponics have been carried out with the output of this Community Partnership Program, namely Posyandu Mawar cadres who understand hydroponic vegetable cultivation and are able to practice it.
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Aryani, Diah, Ignatius Agus Supriyono, Hani Dewi Ariessanti, Shine Pintor Siolemba Patiro, and Ichyan Holilan. "Design Of Smart Hydroponics Based On Raspberry Pi 3." Petir 14, no. 2 (September 2, 2021): 235–46. http://dx.doi.org/10.33322/petir.v14i2.1198.

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The development of hydroponic suitable methods is currently quite good, the utilization of the narrow land availability and the people's attractiveness to hydroponics are the reasons for the developing hydroponic suitable method. However, in its development, there is less land with soil growing media, there is a pattern of farming using water media, namely hydroponics (Hydroponics). Hydroponic cultivation must pay attention to the elements that plants need, such as providing special nutrition to plants. The provision of nutrition that is done manually often results in irregular nutrition in hydroponics which results in disruption of hydroponic plant growth and harvest is not optimal. Research on the Smart Hydroponics System based on the Raspberry Pi 3 using the tidal hydroponic system can make it easier for every human being who wants to grow crops especially who are busy with work activities. With the research methodology using flowchart design methods and system block diagrams, where the Raspberry Pi 3 Mini Computer is used to control pumps in the circulation of hydroponic plant nutrients. Set the nutrient pump On / Off, display a Video Stream from the Cyberlink C170 webcam to check the progress of fruit or vegetable crops ready for harvest. Everything is done remotely via the Web Interface at the Manapu location so that with this research, monitoring can be carried out and it is easier to provide the elements needed by plants
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Zherebtsov, Boris, Alexander Kozlov, and Sergey Netesov. "Analysis and selection of an effective method for growing meristemic potato plants (SolanumTuberosum L.)." АгроЭкоИнфо 7, Special (November 24, 2021): 14. http://dx.doi.org/10.51419/20217014.

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In this article, methods of growing meristemic plants are considered and the basics of hydroponics techniques are studied. Studies of the main characteristics of growing potato plants in a nutrient medium on the basis of a designed automated hydroponic installation are presented and the indicators are compared with traditional methods. Keywords: HYDROPONICS, GROUNDLESS CULTIVATION METHODS, HYDROPONIC AGRICULTURE, HYDROPONIC TECHNOLOGIES
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Zulfarosda, Ratna, and Retno Tri Purnamasari. "Article Review: The Potential of Hydroponics as a Tourist and Educational Object." International Social Sciences and Humanities 1, no. 2 (July 20, 2022): 193–97. http://dx.doi.org/10.32528/issh.v1i2.173.

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Hydroponics has various potentials to be developed as a means of education and tourism. The potential of hydroponics has not been fully understood by the public. The purpose of writing this article is to examine hydroponic opportunities as a tourist attraction and education based on the results of research and community service. The method of compiling this article review is done by conducting a literature study with primary data sourced from journals. The results of the article review show that the potential of hydroponics lies in the education of hydroponic systems, the use of electronic media and technology, modification of hydroponic installations, environmentally friendly plant care and the use of organic pesticides, education on hydroponic farming calculations, and vegetable picking tours and culinary tours. Research related to the use of renewable and environmentally friendly technologies needs to be investigated further and continuous community assistance activities are carried out to support the sustaina-bility of hydroponics.
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Nasrudin, Nasrudin, Yusuf Bahtiar, and Erza Harum Pratiwi. "Business Opportunity from Hydroponics: A Research on Community Service Angle." Jurnal Abdimas 27, no. 2 (December 2, 2023): 93–96. http://dx.doi.org/10.15294/abdimas.v27i2.47551.

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Hydroponics is agricultural cultivation without using soil, so this hydroponic farming system does not require a large area of land for its implementation. Hydroponic plants nowadays are very useful, especially after the pandemic because during the pandemic, the economy is declining, and growing hydroponics is one way to support economic needs. The aim of this research was to develop the potential of natural and economic resources in the surrounding environment and to find out the factors causing the local community's lack of understanding of hydroponics. This research was a community service angle. The method in this research was a descriptive qualitative method. collecting data using interview methods and documentation. The results of the research show that there are still many people who lack information about hydroponic plants, so this is one of the factors preventing hydroponics from developing.
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Sharma, Sahil, Balara Lishika, Aditya Shahi, Shubham, and Shilpa Kaushal. "Hydroponics: The Potential to Enhance Sustainable Food Production in Non-Arable Areas." Current Journal of Applied Science and Technology 42, no. 39 (October 26, 2023): 13–23. http://dx.doi.org/10.9734/cjast/2023/v42i394253.

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Hydroponics, a revolutionary soil-less cultivation method, has garnered significant attention in recent years for its potential to redefine modern agriculture. This review paper delves into the fundamental aspects of hydroponics, ranging from its inception to the cutting-edge developments that promise to reshape the future of food production. This provides an in-depth exploration of the basic principles of hydroponics, Through detailed discussions, we investigate the diversity of methods, from nutrient film technique (NFT) and deep water culture (DWC). A nuanced understanding of each system's mechanics, advantages, and limitations serves as a guide for hydroponic enthusiasts, researchers, and prospective farmers. Nutrient management, the lifeblood of hydroponics, is another focal point. We delve into the precise formulation, monitoring, and delivery of essential nutrients to optimize plant growth and yield. This section offers insights into pH and EC control, nutrient solutions, and the art of maintaining nutrient balance, all of which are crucial for successful hydroponic cultivation. The future of hydroponics beckons with boundless possibilities. The paper emphasizes the need for sustainable Eco-friendly, and efficient methods to feed a growing global population, making hydroponics a key contender. In a world with diminishing arable land and climate change challenges, hydroponics stands as a beacon of hope, promising to revolutionize agriculture and secure the future of food production. This review paper offers a comprehensive road map for anyone interested in understanding the basics of hydroponics, exploring its myriad systems, mastering nutrient management, and envisioning a greener future through hydroponic agriculture.
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Daryadar, Mahsa, Juletta Alexanyan, Stepan Mayrapetyan, Khachatur Mayrapetyan, Anahit Tovmasyan, and Anna Tadevosyan. "Estimating peppermint essential oil levels: water-stream and classical hydroponic systems." Functional Foods in Health and Disease 13, no. 7 (July 31, 2023): 361. http://dx.doi.org/10.31989/ffhd.v13i7.1123.

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Background: The leaves of peppermint and the essential oil received from them are used in medicine. The chemical content of essential oil is quite complex. It contains about 30 terpene compounds. The content of essential oil in flowers is 4-6%; in leaves – 2.4-2.8%, and in stems 0.3%. The main components that define the quality of essential oils are menthol, menthone, limonene, menthofuran, and isomenthone. Peppermint is used in the form of tea, tincture, extract, and salves. It has a regulating influence on the heart and circulatory system. It calms the heartbeat and supports the decrease of blood pressure, and the oil stream is used for dyspnea in the form of inhalation. Plant cream is used against insect bites, eczema, hemorrhoids, muscle pains, and some chronic diseases.Context and purpose of this study: The work aimed to study the content of the main components from the quality indicators of the essential oil of peppermint grown in different water-stream and classical hydroponic systems for the first time in Armenia.Results: From the analyses, it was revealed that the strengthening of the essential oil of peppermint grown in different systems of the water-stream hydroponics (cylindrical, gully, continuous) and classical hydroponics was observed in August. At the same time, high-yield plants of cylindrical and classical hydroponic systems exceeded other variants by 1.3-1.5 times with the essential oil output. In hydroponic systems, the specificities of the physical-chemical indices of peppermint essential oil were also studied. In August, the refractive indicator of essential oil increased to some extent in all variants, except for continuous hydroponics. The lack of increase in continuous hydroponics can likely be explained by the change in the ratio of essential oil to different compounds. At the end of vegetation, in September, some increase of essential oils' specific gravity was observed in the gully (2.1-3.5%) and continuous (4.5-4.7%) modules, while in cylindrical and classical hydroponics the change was minor. During vegetation, the essential oil of plant leaves was subject to not only quantitative but also qualitative changes. The cylindrical system exceeded other water-stream hydroponics variants with the main essential oil menthol component by 1.1-1.4 times and classical hydroponics by 1.1 times. The Gully system exceeded other water-stream systems with the content of D-Limonene and Menthyl acetate 3.6-9.7 and 1.3-3.0 times, respectively. And classical hydroponics 1.4 and 1.7 times, respectively. In the continuous system, the content of Isomentone, Pulegone, and Mint furanone was 1.3-2.0, 3.3-3.5, and 5.7-6.2 times higher, respectively, compared with the other water-stream hydroponic systems, and 1.6, 2.6, and 1.7 times, compared with classical hydroponics. Classical hydroponics exceeded all variants of water-stream hydroponics in the content of Piperidone by 3.3-4.1 times.Conclusion:Although the strengthening of essential oil biosynthesis was observed in all hydroponic variants in August, the cylindrical hydroponic system excelled in the content of essential oils, the most important qualitative indicator of menthol. High output of essential oil in plant raw material was observed in classical hydroponics and cylindrical system of water-stream hydroponics, which provides optimal regimen for the normal growth and development of plants.Keywords: cylindrical, medicinal plant, bioactive compounds, menthol
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Dissertations / Theses on the topic "Hydroponics"

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Földhazy, Erik. "Smart Hydroponics : Conceptual Design of Hydroponic Plant System for Home Environment." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67827.

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Hydroponics is a method of cultivating plants without the use of soil. Soil acts as a growth medium which gives plants stability, provides nutrients and allows roots to be kept wet without drowning. In hydroponics the soil’s functions are replaced by synthesized methods. Stability comes from a substrate (i.e. LECA, rockwool perlite).The 16 essential nutrients are solved in water which are distributed to plants’ roots by different techniques. To generate photosynthesis natural light is replaced by artificial light, especially red light in the proximity of 660 nm. Hydroponics has been used as a cultivation method for at least 2000 years. During the 20th century industrial applications became common since plastics allowed for complex systems engineering. The method also makes it possible to grow the same amount of crops with approximately 10% water usage and 25% of the area compared to conventional cultivation. During the past few years systems for home use has emerged but the product genre is still in its cradle. This master thesis covers a new conceptual design of a hydroponic home system. The project was carried out at Omecon AB in Stockholm as a consulting design project. Omecon AB is an engineering consultant agency within mostly mechanical construction looking to widen the competence base. Using a design process based on Human-Centered Design the project involved the stakeholders users, extreme users, Omecon AB, plant experts, electronics engineering and service as well as plastics design engineering. Additional/supplemental economical–, ecological– and social sustainability aspects has been considered during all phases of the process. By using the Human-Centered Design process the problem range is expanded from its initial state which results in a more complete end result. Common methodology altered with some unorthodox twists has been utilized throughout the project. The final result is a conceptual hydroponic system for home environment which is designed as an interior design product as well as a high-performance cultivation system. By using natural materials such as wood and steel the users expands its life span and thus mitigates the negative environmental impact. Another aspect which prolongs the products life span is the modular usage which lets users vary and choose their preferred settings. All manufactured materials included in the final concept were flow resources and the parts were engineered to be easily separable for future replacement and recycling. A new type of pot was invented along with a new way of adjusting the height-wise position of lamps. The aeroponic technique, which was applied to this concept, is generally considered to generate the largest plants and thus comprises higher performance compared to other home systems. The use of substrate was also eliminated which decreases continous material consumption within hydroponics.
Hydroponik är en metod för att odla växter utan jord. Jord i odling agerar som ett växtmedium som ger plantor stabilitet, tillför näringsämnen och tillåter rötter att vara i väta utan att dränka dem. I hydroponik ersätts jordens funktioner med syntetiska metoder. Stabilitet ges av ett substrat (t.ex. LECA-kulor, stenull eller perlit). De 16 essentiella näringsämnena löses i vatten och distribueras till plantors rötter med hjälp av olika tekniker. For att skapa fotosyntes ersätts naturligt ljus med artificiellt ljus. Speciellt rött ljus i närheten av 660 nm. Hydroponik har använts som odlingsmetod i åtminstånde 2000 år. Under 1900-talet blev industiella applikationer vanliga eftersom plast möjliggjorde tillverkling av komplexa system. Metoden tillåter även att odla samma mängd grödor med 10% av vattenmängden och 25% av ytan jämfört med konventionell odling. Under de senaste åren har system avsedda för användning hemma blivit vanligare men produktgenren är fortfarande ung. Det här examensarbetet täcker en ny konceptuell design av ett hydroponiskt system för hemmabruk. Projektet utfördes på Omecon AB i Stockholm som ett konsultarbete inom design. Omecon AB är en konsultfirma som mestadels är verksamma inom mekanikkonstruktion men de vill vidga sin kompetens. Genom användning av en designprocess som har baserats på Human-Centered Design har projektet involverat intressenterna användare, extrema användare, Omecon AB, växtexperter, en elektronikingenjör samt plastkonstruktion. Vidare har aspekter inom ekonomisk–, ekologisk– och social hållbarhet beaktats genom alla faser av processen. Via användning av Human-Centered Design-processen har problemrummet expanderats från den initiala utgångspunkten vilket resulterar i ett mer komplett slutresultat. Vanlig metodik varvat med okonventionella anpassningar har använts genom projektet. Slutresultatet består av ett konceptuellt hydroponiskt system för hemmabruk som är designat som en inredningsprodukt samt ett odlingssystem med hög prestanda. Genom användning av naturliga material som trä och stål förlänger användarna produktens livslängd och på så sätt förmildras den negativa klimatpåverkan. En annan aspekt som förlänger produktens livslängd är moduläriteten som låter användare variera och välja deras föredragna inställningar. Alla tillverkade material inkluderade i slutkonceptet var flödesresurser och delarna konstruerades så att de går lätt att separera för framtida ersättning och återvinning. En ny typ av kruka uppfanns tillsammans med ett nytt sätt att justera höjden av lamporna. Den aeroponiska tekniken, som används is konceptet, är allmänt ansedd att generera de största plantorna och innefattar därför högre prestanda jämfört med andra hydroponiska hemmasystem. Användning av substrat eliminerades också vilket minskar kontinuerlig materialkonsumption inom hydroponik.
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Novotný, Tomáš. "Design domácího systému pro hydroponické pěstování rostlin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231032.

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Research in the field of hydroponics from the second half of 20th century and 21st century described how the components of hydroponic systems are related to each other and established a basis for construction and operation of complex and reliable systems of hydroponic agriculture. These systems are predominantly constructed as means for mass production in agriculture or are built by individuals to be used in their garden or greenhouse. The role of design in production of these devices is rather limited. The goal of this work is to introduce hydroponics as a complex system of many interconnected parameters and to assess hydroponic systems from the perspective of design. The objective is to design such a solution that would incorporate all the elements that make up a hydroponic system and design itself. This design ought to respect not only the need to provide a suitable environment for plant growth but also the need of efficiency, ergonomics and design.
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Lidholm, Viktor, and Pelle Lund. "Sensorelektronik för hydroponisk odling." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166952.

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Projektet gick ut på att skapa ett system för att automatisera en hydroponisk odling, ta fram vilka storheter som är intressanta att mäta och sedan skapa elektronik för det. Det var snabbt tydligt att det är elektrisk konduktivitet (EC), pH och temperatur som är intressant att mäta. EC är ett estimat över näringsinnehållet i vattnet, pH i vattnet måste vara i rätt nivå för att växterna ska kunna ta upp näringen och temperaturen måste vara inom rätt område för att växterna ska växa. Sensorerna som valdes fungerar väldigt olika och därför skapades olika kretsar för vardera sensor. EC och temperatursensorn fick även två olika kretsar för att kunna utvärdera vilken metod som har fungerat bäst. Kretsarna skapades i en simulator och när de gav önskvärt beteende konstruerades ett PCB utifrån simuleringsritningarna. En mikrokontroller användes för att styra kretsarna och hantera mätdata för att sedan skicka det vidare till en Raspberry Pi för att skriva ut värden på en skärm. Resultaten som kretsarna gav i slutändan är tillfredställande och mycket väl inom noggrannheten som en hydroponisk odling kräver.
The project was to create a system for automating hydroponic cultivation, identifying the quantities that are relevant to measure and then creating electronics for it. It quickly became clear that it is electrical conductivity (EC), pH and temperature that are relevant to measure. EC is an estimate of the nutrient content of the water, the pH of the water must be at the right level for the plants to absorb the nutrients and the temperature must be within a certain range for the plants to grow. The sensors selected work very differently and therefore different circuits were designed for each sensor. The EC and the temperature sensor were also given two different circuits in order to evaluate which method was best suited. The circuits were designed in a simulator and when they provided desirable behaviour, a PCB was designed based on the simulation schematics. A microcontroller was used to control the circuits and manage the measurement data and then pass it on to a Raspberry Pi in order to display values ​​on a screen. The results that the circuits ultimately gave are satisfactory and very well within the accuracy required by hydroponic cultivation.
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Al-Harbi, Abdulaziz R. A. K. "Salinity and the growth of cucumber in hydroponics." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46641.

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Littlefield, Joanne. "Controlled Environment Agriculture: Greenhouses Feature High-Tech Hydroponics." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/622255.

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Prieto, Yanes Andrés. "Development of an IoT Board for Indoor Hydroponics." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280305.

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This thesis has been written for Hollbium AB, a Stockholm based Startup that provides a system called the Loop that grows edible plants in office spaces. This degree project reviews literature on hydroponics systems and design formanufacturing (DFM). The reviewed material alongside identified needs from the stakeholders serve as input for the design of an electronics board that controls The Loop.
Denna masteruppsats har skrivits för Hollbium AB:s räkning, ett Stockholmsbaserat startupföretag som levererar ett system kallat The Loop vars syfte är att odla ätbara växter i kontorsmiljö. Det här examensarbetet har innefattat granskning av litteratur relaterat till hydroponiksystem samt design för tillverkning (DFM). Den granskade litteraturen i kombination med av intressenterna identifierade behov har legat till grund för utformningen av ett elektroniksystem för styrning av The Loop.
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Lundin, Karl, and Oscar Olli. "Automated hydroponics greenhouse : Regulation of pH and nutrients." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226662.

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The purpose of this project is to create a fully automatedgreenhouse that can produce year-round crops, using sensorsand actuators. Temperature in both water and air,relative humidity, water level, nutrient level and pH are allmeasured with different sensors. Though only water level,pH and nutrients will be regulated. The greenhouse will berelying on a hydroponic growing technique, meaning thatthe growing is soil-less and will be done in water. Thismakes measuring and controlling said levels easier and alsominimizes water waste and makes for a more environmentalsystem. The main focus of this project is on regulating pHand nutrient levels of the water. The system has shown tobe stable and self regulating within the desired intervals fornutrient concentration and pH for growing basil.
Syftet med det här projektet är att skapa ett automatiserat växthus som kan producera grödor året runt med hjälp av sensorer och aktuatorer. Med olika sensorer mäts temperaturen i både vattnet och luften, relativa luftfuktigheten, vattennivå, pH- och näringsvärden. Dock kommer endast vattennivå, pH- och näringsvärden regleras. Växthuset använder sig av så kallad hydroponisk odling, vilket innebär att odlingen inte sker i jord utan i vatten. Detta underlättar bland annat mätningar och kontrollering av systemet men minimerar även vattenkonsumptionen och bidrar till ett mera miljövänligt system. Projektet kommer i huvudsak inrikta sig på reglering av pH och näringsnivåer av vattnet. Systemet har visats stabilt och har förmågan att reglera sig självt inom önskat intervall för näringskoncentration och pH för att odla basilika.
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Martin, Colin. "Towards a Hydroponic Architecture." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1554119967725464.

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Walker, Sara. "The multiplication, rooting and acclimatization of micropropagated roses." Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358566.

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com, nora_oyama@hotmail, and Noraisha Oyama. "Hydroponics system for wastewater treatment and reuse in horticulture." Murdoch University, 2008. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20091117.125236.

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As human population increases, the need for water increases in domestic, agricultural, industrial and urban sectors. Wastewater reuse after treatment is gaining acceptance world wide, as availability of fresh water sources decreases. However, it is also important to point out social and cultural differences that still exist in different pars of the world including those where reuse of wastewater for food production or any domestic use is not yet acceptable. The major concerns with effluent reuse are primarily its impact on human health and environmental risk. As a result, effluent reuse should be undertaken with caution after careful consideration of the potential impacts and risks. This thesis examined the potential to use the hydroponics nutrient film technique to grow commercially important crops using secondary-treated domestic wastewater. The crops chosen were a fruit crop (Lycopersicon esculantum - tomato), a leafy crop (Beta vulgaris ssp. cicla - silver beet) and a flower crop (Dianthus caryophyllus - carnation). Secondary-treated domestic wastewater was chosen because of the reduced risk of pathogen and heavy metal contamination in the crops and due to the guideline requirements for use of treated effluent for food crops. The possibility of using the effluent after the hydroponics treatment for further irrigation was also studied. The ability of secondary-treated effluent to supply adequate nutrients to the crops was assessed relative to a commercially available hydroponics solution (Chapter 3). The amount of time the solution was left in the system (nutrient solution retention time) was dependant on the plant uptake of the solution. The results obtained showed that the nutrients in secondary treated effluent was adequate for the carnations, but not for the food crops. The food crops from both treatments were compared to the produce purchased from a supermarket. The food crops showed signs of nutrient deficiency, particularly nitrogen. Based on the findings of the first experiment, the nutrient solution retention time was amended to 14 days. The carnations were not tested with the shorter nutrient solution retention time (NSRT) because they performed well in the previous trial with the longer nutrient solution retention time. The edible food crops performed better and did not show signs of nutrient deficiency when the nutrient solution retention time was reduced to 14 days. Further statistical analysis was conducted with the data from Chapters 3 and 4. Nutrient and water balances were calculated and the possible reason that the plants grown in the 14-day nutrient solution retention time took up more water, was a result of increased nutrients and better growth. A simple model was constructed to calculate height of the plants using multiple regression. The model was validated against the data collected from this study. The experiment conducted in Chapter 6 determined the nutritional quality of the food crops. The harvests from the wastewater and commercially available hydroponics solution were compared to produce purchased from a supermarket and tested for total caroteniods, total soluble solids and ascorbic acid concentrations. The nutritional quality of the wastewater grown produce was comparable to those grown in the hydroponic solution and those purchased. The risk of pathogen contamination to food crops and the die-off of pathogens in the hydroponic channels were studied in Chapter 7. This was tested by spiking the commercial hydroponic medium with Escherichia coli and Salmonella typhimurium and monitoring bacterial pathogen die-off in the secondary treated domestic wastewater. The pathogen quality of the crop was tested in all treatments as well as on organically grown produce found at a local supermarket. The results of this experiment did not show any contamination on the surface of the food crops or within the food crops. This study demonstrated that growing tomatoes, silver beet and carnations using secondary-treated domestic wastewater was successful when the nutrient solution retention time was adjusted to the optimum level. In arid, developing and remote communities, this system is ideal as it conserves and reuses water for commercially important crops without compromising the health of the environment or of human beings. It can also be implemented in urban areas, as the system can be scaled according to the availability of space. In addition to this, the effluent after going through this system can be used for open irrigation as it meets the World Health Organisation guidelines. However, a number of additional concerns need further investigation. They include the transmission risk of other types of pathogen, which depends on the source of wastewater, and the effects of hormones and antibiotics on food crops and their effect on human health.
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Books on the topic "Hydroponics"

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Kopolow, Carol. Hydroponics. Beltsville, Md: National Agricultural Library, 1991.

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Mason, John. Commercial hydroponics. Kenthurst, NSW: Kangaroo Press, 1990.

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Bridwell, Raymond. Hydroponic gardening: The "magic" of modern hydroponics for the home gardener. Santa Barbara, Calif: Woodbridge Press Pub. Co., 1989.

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Hydroponics and protected cultivation: a practical guide. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0000.

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Abstract This book contains 14 chapters. It is a practical guide about hydroponics and protected cultivation. Topics covered include: background and history of hydroponics and protected cultivation; greenhouses and protected cropping structures; greenhouse operation and management; hydroponic systems - solution culture; substrate-based hydroponic systems; organic soilless greenhouse systems; propagation and transplant production; plant nutrition and nutrient formulation; plant Health, plant protection and abiotic factors; hydroponic production of selected crops; plant factories - closed plant production systems; greenhouse produce quality and assessment; and harvest and postharvest factors.
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Hydroponics: Hydroponic Gardening Basics. Speedy Publishing LLC, 2013.

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ANDREW, James. Hydroponics: The Ultimate Hydroponic Secrets. Independently Published, 2022.

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Kirmer, Karen. DIY Hydroponics : Begin Your Hydroponic Garden Without Difficulty: Hydroponics for Beginners. Independently Published, 2021.

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Deschanel, Zooey. Hydroponics: A Beginner's Guide to Hydroponic Gardening. Independently Published, 2020.

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Morrow, Erin. Hydroponics for Beginners: Essential Hydroponic Gardening Guide. Speedy Publishing LLC, 2015.

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Hughston, Michael. Hydroponics : Hydroponic Gardening: Growing Vegetables Without Soil. CreateSpace Independent Publishing Platform, 2015.

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Book chapters on the topic "Hydroponics"

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Morgan, Lynette. "Organic soilless greenhouse systems." In Hydroponics and protected cultivation: a practical guide, 100–117. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0007.

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Abstract This chapter discusses the organic soilless greenhouse systems. It includes topics on organic greenhouse production, organic hydroponic systems, organic hydroponic nutrients, microbial mineralization of organic nutrients for hydroponics, anaerobic and aerobic processing of organic materials, vermicast and vermicomposting, use of vermiculture liquids in hydroponics, composting for organic nutrient processing and substrate preparation, organic materials for vermicast, composting and biodigester systems, auqaponics, organic hydroponic production systems, biofilms in hydroponic systems, nutrient amendmentsorganic certification in the USA, organic pest and disease control, hybrid systems, and issues commonly encountered with organic hydroponic systems.
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Morgan, Lynette. "Organic soilless greenhouse systems." In Hydroponics and protected cultivation: a practical guide, 100–117. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0100.

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Abstract This chapter discusses the organic soilless greenhouse systems. It includes topics on organic greenhouse production, organic hydroponic systems, organic hydroponic nutrients, microbial mineralization of organic nutrients for hydroponics, anaerobic and aerobic processing of organic materials, vermicast and vermicomposting, use of vermiculture liquids in hydroponics, composting for organic nutrient processing and substrate preparation, organic materials for vermicast, composting and biodigester systems, auqaponics, organic hydroponic production systems, biofilms in hydroponic systems, nutrient amendmentsorganic certification in the USA, organic pest and disease control, hybrid systems, and issues commonly encountered with organic hydroponic systems.
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Barker, Allen V. "Hydroponics." In Science and Technology of Organic Farming, 215–33. 2nd ed. Second edition. | Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003093725-15-15.

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Morgan, Lynette. "Hydroponic production of selected crops." In Hydroponics and protected cultivation: a practical guide, 196–228. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0011a.

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Abstract While there is a wide range of potentially profitable crops which can be grown in hydroponics under protected cultivation, greenhouse production is dominated by fruiting crops such as tomatoes, cucumber, capsicum and strawberries, and vegetative species such as lettuce, salad and leafy greens, herbs and specialty crops like microgreens. This chapter summarizes information on a selected range of common hydroponic crops to give basic procedures for each and an outline of the systems of production. These crops include tomato, capsicum or sweet bell pepper, cucumber, lettuce and other salad greens, strawberry and rose. Information is given on their hydroponic production systems and environment, propagation, plant density, pruning, pollination, fruit growth, crop nutrition, pests, diseases, disorders, harvesting and postharvest handling.
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Morgan, Lynette. "Hydroponic production of selected crops." In Hydroponics and protected cultivation: a practical guide, 196–228. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0196.

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Abstract While there is a wide range of potentially profitable crops which can be grown in hydroponics under protected cultivation, greenhouse production is dominated by fruiting crops such as tomatoes, cucumber, capsicum and strawberries, and vegetative species such as lettuce, salad and leafy greens, herbs and specialty crops like microgreens. This chapter summarizes information on a selected range of common hydroponic crops to give basic procedures for each and an outline of the systems of production. These crops include tomato, capsicum or sweet bell pepper, cucumber, lettuce and other salad greens, strawberry and rose. Information is given on their hydroponic production systems and environment, propagation, plant density, pruning, pollination, fruit growth, crop nutrition, pests, diseases, disorders, harvesting and postharvest handling.
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Morgan, Lynette. "Background and history of hydroponics and protected cultivation." In Hydroponics and protected cultivation: a practical guide, 1–10. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789244830.0001.

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Abstract Along with new types of protected cropping structures, materials and technology, the range and diversity of hydroponic crops grown are also expanding. While the greenhouse mainstays of nursery plants, tomatoes, capsicum, cucumber, salad vegetables and herbs will continue to expand in volume, newer, speciality and niche market crops are growing in popularity. These include new cut flower species, potted plants and ornamental crops, and a growing trend in the commercial production of medicinal herbs using high-technology methods such as aeroponics. Exotic culinary herbs such as wasabi, dwarf fruiting trees and spices such as ginger and vanilla are now grown commercially in protected cropping structures, while many home gardeners continue to take up hydroponics and protected cropping as both a hobby and a means of growing produce. Protected cropping and hydroponic methods will further their expansion into hostile climates which never previously allowed the production of food.
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Kumar, Rohitashw, and Vijay P. Singh. "Hydroponics and Vertical Farming." In Plasticulture Engineering and Technology, 309–26. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003273974-16.

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Kumar, Abhijit, Gunjan Mukherjee, and Saurabh Gupta. "Environmental Remediation Using Hydroponics." In Springer Water, 115–41. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53258-0_5.

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Kumar, Prasann, and Shipa Rani Dey. "Hydroponics Phytoremediation: An Overview." In Springer Water, 361–96. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53258-0_13.

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Resh, Howard M. "Tropical Hydroponics and Special Applications." In Hydroponic Food Production, 437–79. 8th ed. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003133254-15.

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Conference papers on the topic "Hydroponics"

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Popov, Vladimir. "HYDROPONICS IS A NEW PARADIGM AND A WAY OF FODDER PRODUCTION INTENSIFICATION." In Multifunctional adaptive feed production. ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-22-70-134-144.

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Hydroponics is a way of intensification and a new paradigm of fodder production: from adaptive plant growing to operated cultivation of green mass of the set property. In a review the precondition of introduction of the alternative high-quality green foods "know-how" in completely controllable conditions are presented. Terms and definitions of the general concept and separate parts of hydroponic forage are given. Hydroponics makes for every day providing animals with the adequate quantity of high-quality forage. The hydroponics of forages allows to cultivate ecologically pure and organic product commercially, within economically defensible expenses. The synergy is shown and examples of zootechnical and economic efficiency are resulted.
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Prasetyo, Vincentius Riandaru, Yudhistira Anggara Jayadinata, and Naufal Muflih Ramadhan. "Implementation of Three Types of Sensors for Monitoring Plant Development in Hydroponic Media." In The 4th International Conference on Science and Technology Applications. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-tsb27g.

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Hydroponics is an agricultural cultivation system without using soil media. Hydroponics is an agricultural activity carried out using water as a medium to replace soil. Hydroponics emphasizes meeting the nutritional needs of plants through the flow of water. If nutrients are given through fertilizer in soil media, then in hydroponics, the nutrients are dissolved and flow through water. The concentration of nutrients that dissolve in water will affect the high and low pH of the water. The pH level in the water will affect the development and growth of plants. In addition, air humidity can also affect plant growth, especially for plants grown in a greenhouse. Therefore, special attention is needed to maintain the pH level in the water. The particular concern is when is the right time to replace the water or add nutrients to the water. However, the large land area and the limited number of workers owned by the partners make it difficult for them to monitor the development and growth of existing plants. Therefore, a sensor will be installed in the hydroponic system to monitor the plant's development and growth. Based on the results of the tests and evaluations, the three hydroponic monitoring sensors, which include the pH sensor, nutrient solution concentration sensor, and air humidity sensor, may be properly programmed on the Arduino. The measurements between sensors and manual measurements showed an error value of 0.36% for pH measurements, 0.56% for EC measurements, and 0.42% for humidity measurements.
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Ghorbel, Roukaya, and Nedim Koşum. "Hydroponic Fodder Production: An Alternative Solution for Feed Scarcity." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.005.

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Feeds and animal nutrition presents a major sector in providing food security. However, there is a large gap between fodder supply and demand [1]. This gap can be attributed basically to climatic changes, urbanization and increase in meat demand. Nowadays, especially after the covid-19 pandemic, there is a crucial problem in supplying fresh green feed to remote and urban regions. Hydroponic fodder is an alternative solution to provide the sustainability of quality forage for ruminant. Hydroponics can include several crops such as maize, wheat and barley, the fodder can be produced in a short duration (6-10 days) and all year around. The hydroponics fodder present various benefits for animal health. Feeding hydroponically produced fodder increases the digestibility of the nutrients in the ration, which could increase milk production [2]. Hydroponic fodder production is an economic solution particularly where the conventional production of green fodder is limited or unavailable. This technology put forward a solution to address the shortage of forage production caused by the scarcity of green feed in dry seasons and urban areas [3]. That´s why, further studies and academic efforts are needed to expand hydroponic fodder production. The purpose of this study is to review the actual literature on hydroponic fodder production process, nutritious value and effects on livestock production and productivity.
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Takeuchi, Yuichiro. "Printable Hydroponics." In ISS '18: 2018 ACM International Conference on Interactive Surfaces and Spaces. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3279778.3279929.

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Nalwade, Rahul, and Tushar Mote. "Hydroponics farming." In 2017 International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2017. http://dx.doi.org/10.1109/icoei.2017.8300782.

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Li, Jialong, Zhenyu Mao, Zhen Cao, Kenji Tei, and Shinichi Honiden. "Self-adaptive Hydroponics Care System for Human-hydroponics Coexistence." In 2021 IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech). IEEE, 2021. http://dx.doi.org/10.1109/lifetech52111.2021.9391909.

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Aliac, Chris Jordan G., and Elmer Maravillas. "IOT Hydroponics Management System." In 2018 IEEE 10th International Conference on Humanoid, Nanotechnology, Information Technology,Communication and Control, Environment and Management (HNICEM). IEEE, 2018. http://dx.doi.org/10.1109/hnicem.2018.8666372.

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Ikehara, Tadaaki, Kazuki Oyama, and Kazuyuki Kojima. "Development of Smart Hydroponics System." In 2023 IEEE 12th Global Conference on Consumer Electronics (GCCE). IEEE, 2023. http://dx.doi.org/10.1109/gcce59613.2023.10315368.

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Dutta, Arjun, Ishita Nag, Shreya Basu, Ditipriya Seal, and Rintu Kumar Gayen. "IoT based Indoor Hydroponics System." In 2021 5th International Conference on Electronics, Materials Engineering & Nano-Technology (IEMENTech). IEEE, 2021. http://dx.doi.org/10.1109/iementech53263.2021.9614730.

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Usha, P., Uday Malagar, Yashwanth V., Sanjay K., and Vishnu Prasad. "IoT Based Efficient Hydroponics System." In International Conference on Intelligent and Sustainable Power and Energy Systems. SCITEPRESS - Science and Technology Publications, 2023. http://dx.doi.org/10.5220/0012522200003808.

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Reports on the topic "Hydroponics"

1

Sonneveld, Cees, and Wim Voogt. Complexvorming van spoorelementen in substraten en hydroponics : Een samenvatting van resultaten uit onderzoek en literatuur. Bleiswijk: Wageningen University & Research, BU Glastuinbouw, 2019. http://dx.doi.org/10.18174/472921.

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Tranel, Larry F. Hydroponic Fodder Systems for Dairy Cattle? Ames (Iowa): Iowa State University, January 2013. http://dx.doi.org/10.31274/ans_air-180814-606.

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Blok, Chris, Erik van Os, Raed Daoud, Laith Waked, and A. Hasan. Hydroponic Green Farming Initiative : increasing water use efficiency by use of hydroponic cultivation methods in Jordan : final report. Bleiswijk: Wageningen University & Research, BU Greenhouse Horticulture, 2017. http://dx.doi.org/10.18174/426168.

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Delyea, Cole. Effects of music on lettuce germination and growth in a hydroponic system. Preregistration. ResearchHub Technologies, Inc., October 2023. http://dx.doi.org/10.55277/researchhub.d4eu3e95.

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Lynch, Ryan T. Targeted Breeding of Fusarium Wilt Resistance in Spinach Using a Hydroponic Selection Assay. Ames (Iowa): Iowa State University, December 2023. http://dx.doi.org/10.31274/cc-20240624-1375.

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Delyea, Cole. Effects of music on lettuce germination and growth in a hydroponic system. Preregistration (v3). ResearchHub Technologies, Inc., November 2023. http://dx.doi.org/10.55277/researchhub.w177k7ic.

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Delyea, Cole. Effects of music on lettuce germination and growth in a hydroponic system. Preregistration (v2). ResearchHub Technologies, Inc., November 2023. http://dx.doi.org/10.55277/researchhub.u5ti4y67.

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Katan, Jaacov, and Michael E. Stanghellini. Clinical (Major) and Subclinical (Minor) Root-Infecting Pathogens in Plant Growth Substrates, and Integrated Strategies for their Control. United States Department of Agriculture, October 1993. http://dx.doi.org/10.32747/1993.7568089.bard.

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In intensive agriculture, harmful soilborne biotic agents, cause severe damage. These include both typical soilborne (clinical) major pathogens which destroy plants (e.g. Fusarium and Phytophthora pathogens), and subclinical ("minor") pathogens (e.g. Olpidium and Pythium). The latter cause growth retardation and yield decline. The objectives of this study were: (1) To study the behavior of clinical (major) and subclinical (minor) pathogens in plant growth substrate, with emphasis on zoosporic fungi, such as Pythium, Olipidium and Polymyxa. (2) To study the interaction between subclinical pathogens and plants, and those aspects of Pythium biology which are relevant to these systems. (3) To adopt a holistic-integrated approach for control that includes both eradicative and protective measures, based on a knowledge of the pathogens' biology. Zoospores were demonstrated as the primary, if not the sole propagule, responsible for pathogen spread in a recirculating hydroponic cultural system, as verified with P. aphanidermatum and Phytophthora capsici. P. aphanidermatum, in contrast to Phytophthora capsici, can also spread by hyphae from plant-to-plant. Synthetic surfactants, when added to the recirculating nutrient solutions provided 100% control of root rot of peppers by these fungi without any detrimental effects on plant growth or yield. A bacterium which produced a biosurfactant was proved as efficacious as synthetic surfactants in the control of zoosporic plant pathogens in the recirculating hydroponic cultural system. The biosurfactant was identified as a rhamnolipid. Olpidium and Polymyxa are widespread and were determined as subclinical pathogens since they cause growth retardation but no plant mortality. Pythium can induce both phenomena and is an occasional subclinical pathogen. Physiological and ultrastructural studies of the interaction between Olpidium and melon plants showed that this pathogen is not destructive but affects root hairs, respiration and plant nutrition. The infected roots constitute an amplified sink competing with the shoots and eventually leading to growth retardation. Space solarization, by solar heating of the greenhouse, is effective in the sanitation of the greenhouse from residual inoculum and should be used as a component in disease management, along with other strategies.
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Raghothama, Kashchandra G., Avner Silber, and Avraham Levy. Biotechnology approaches to enhance phosphorus acquisition of tomato plants. United States Department of Agriculture, January 2006. http://dx.doi.org/10.32747/2006.7586546.bard.

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Abstract: Phosphorus is one of the least available macronutrient in the soil. The high affinity phosphate transporters are known to be associated with phosphate acquisition under natural conditions. Due to unique interactions of phosphate with soil particles, up to 80% of the applied phosphates may be fixed forcing the farmers to apply 4 to 5 times the fertilizers necessary for crop production. Efficient uptake and utilization of this essential nutrient is essential for sustainability and profitability of agriculture. Many predictions point to utilization/exhaustion of high quality phosphate rocks within this century. This calls for efforts to improve the ability of plants to acquire and utilize limiting sources of phosphate in the rhizosphere. Two important molecular and biochemical components associated with phosphate efficiency are phosphate transporters and phosphatases. This research project is aimed at defining molecular determinants of phosphate acquisition and utilization in addition to generating phosphate uptake efficient plants. The main objectives of the project were; Creation and analysis of transgenic tomato plants over-expressing phosphatases and transporters Characterization of the recently identified members (LePT3 and LePT4) of the Pi transporter family Generate molecular tools to study genetic responses of plants to Pi deficiency During the project period we have successfully identified and characterized a novel phosphate transporter associated with mycorrhizal symbiosis. The expression of this transporter increases with mycorrhizal symbiosis. A thorough characterization of mutant tomato lacking the expression of this gene revealed the biological significance of LePT3 and another novel gene LePT4. In addition we have isolated and characterized several phosphate starvation induced genes from tomato using a combination of differential and subtractive mRNA hybridization techniques. One of the genes, LePS2 belongs to the family of phospho-protein phosphatase. The functionality of the recombinant protein was determined using synthetic phosphor-peptides. Over expression of this gene in tomato resulted in significant changes in growth, delay in flowering and senescence. It is anticipated that phospho-protein phosphatase may have regulatory role in phosphate deficiency responses of plants. In addition a novel phosphate starvation induced glycerol 3-phosphate permease gene family was also characterized. Two doctoral research students are continuing the characterization and functional analysis of these genes. Over expression of high affinity phosphate transporters in tobacco showed increased phosphate content under hydroponic conditions. There is growing evidence suggesting that high affinity phosphate transporters are crucial for phosphate acquisition even under phosphate sufficiency conditions. This project has helped train several postdoctoral fellows and graduate students. Further analysis of transgenic plants expressing phosphatases and transporters will not only reveal the biological function of the targeted genes but also result in phosphate uptake and utilization efficient plants.
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