Дисертації з теми "Agricultural management of nutrients"
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Malone, Sarah J. "Agricultural nonpoint source pollution management : water quality impacts of Balm Road Treatment Marsh, Hillsborough County, Florida." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003211.
Повний текст джерелаHERRERA, MORENO AXEL MAURICIO. "ENVIRONMENTAL ASSESSMENT OF UNDERCURRENT AGRICULTURAL TECHNOLOGIES TOWARDS CIRCULAR NUTRIENT MANAGEMENT." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/885232.
Повний текст джерелаGedikoglu, Haluk McCann Laura. "Adoption of nutrient management practices." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6614.
Повний текст джерелаLiu, Yingmei. "Effective Modeling of Nutrient Losses and Nutrient Management Practices in an Agricultural and Urbanizing Watershed." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/40398.
Повний текст джерелаPh. D.
Littlejohn, Alex. "Nutrient mitigation capacity of low-grade weirs in agricultural drainage ditches." Mississippi State University, 2013.
Знайти повний текст джерелаJakrawatana, Napat Civil & Environmental Engineering Faculty of Engineering UNSW. "An integrated decision support tool for more sustainable management of biomass resources in agricultural regions." Awarded By:University of New South Wales. Civil & Environmental Engineering, 2009. http://handle.unsw.edu.au/1959.4/44547.
Повний текст джерелаWamsley, Peter Randal. "Laboratory Analysis of Sustainable Nutrient Treatment Methods for Agricultural Runoff." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1334797563.
Повний текст джерелаMason, Rachel. "Modeling Agricultural Outcomes in a Warmer, Wetter Vermont." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1034.
Повний текст джерелаPessarakli, Mohammed, David M. Kopec, and Jeff J. Gilbert. "Growth Responses of Bermudagrass to Different Levels of Nutrients in the Culture Medium." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/216540.
Повний текст джерелаPaull, Rachel May. "Evaluating the Role of Biotic and Abiotic Ecosystem Components on the Retention and Removal of Ditch Nutrients in Ditches of Different Construction." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1594220539737151.
Повний текст джерелаBalcerzak, Ashlee Marie. "Evaluating Long-term Nutrient Impacts within Agricultural Headwater Streams." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1598021048962491.
Повний текст джерелаHammond, Leslie. "Nutrient Availability and Dynamics of Compost Bedded Pack Dairy Barn Waste." UKnowledge, 2015. http://uknowledge.uky.edu/pss_etds/68.
Повний текст джерелаArmstrong, Jarrod Matthew. "Nitrogen Availability and Transport Following Drought in Three Agricultural Watersheds in Central Illinois." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1634.
Повний текст джерелаHedlund, Anna. "Nutrient management in smallholder peri-urban farming systems : a case study in southern Vietnam /." Uppsala : Dept. of Soil Sciences, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/9212291.pdf.
Повний текст джерелаSisung, Theresa. "Soil testing and nutrient application practices of agricultural retailers in the Great Lakes Region." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32556.
Повний текст джерелаAgricultural Economics
Terry Griffin
Agricultural runoff containing phosphorus is believed to be a major contributor of algae blooms in the Western Lake Erie Basin. However, the implementation of best management practices (BMPs) can be used to help reduce the runoff of phosphorus. This research involved conducting surveys to analyze the current implementation of BMPs in Michigan and Indiana. The hypothesis is that the survey results are similar between the two states. An additional hypothesis is that the Michigan and Indiana results are similar to results from two other studies that were previously conducted. The results from this research generally support the hypothesis that a similar number of farmers in Michigan and Indiana are already implementing best management practices on their farms. In addition to the results being similar across Michigan and Indiana, there is also some evidence that shows that the results are similar to studies from the Ohio State University (LaBarge and Prochaska 2014), CropLife magazine (Erickson and Widmar 2015) and NRCS (U.S. Department of Agriculture, Natural Resources Conservation Service 2016); however upon further investigation there are distinct differences before and after media mentions of ramifications from the Lake Erie algal blooms. While it is difficult to force farmers to implement BMPs, the results of this study may help to educate them, which may cause them to add these practices to their operations.
Henderson, Kelsey. "Reverse Osmosis as a Chemical-Free Technology for the Removal of Nutrients from Cure Meat Processing Wastewater." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563470474960378.
Повний текст джерелаSmith, Craig Matthew. "An analysis of alternative soil, nutrient, and water management strategies." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/10723.
Повний текст джерелаDepartment of Agricultural Economics
Jeffery R. Williams
The two topics addressed in this dissertation are both related to surface water quality. Reservoir sedimentation and water quality trading are examined from economic and environmental perspectives. Each topic and the resulting policy implications are relevant to stakeholders at the local, state, and federal levels. Reservoir sedimentation has been recognized as a major environmental, social, and economic issue in much of the Midwestern US. There is an effort to focus public and private funds to achieve the greatest return on the investment from soil erosion and sediment reduction strategies. How can physiographical and economic relationships within the watershed be quantified in such a way to provide insights into the selection of alternative management strategies? This study focuses on answering that question by integrating a physically-based watershed model with an economic analysis of alternative sedimentation reduction strategies for the case of Tuttle Creek Lake located in northeastern Kansas. Several key finding of this study are that both physiographical and economic factors must be considered for cost-effective conservation to occur. Considering these factors and targeting BMP implementation from 8 to 23 times more cost-effective than random implementation. If targeting cannot be done effectively or if “intangible” costs of BMP implementation are too large, dredging is likely to be more cost-effective. While this research compares the cost-effectiveness of various BMP implementation approaches in Kansas with dredging, the benefits associated with each of these strategies is not addressed. While there is substantial evidence that nonpoint sources have lower nutrient reduction costs than point sources, experience with water quality trading (WQT) reveals a common theme: little or no trading activity. These outcomes suggest the presence of obstacles to trading that were not recognized in the design of existing programs. To examine the ways that various market imperfections may impact the performance of a WQT market, an agent-based model is constructed, which simulates a hypothetical point-nonpoint market. This study first presents an overview of the concepts and simulation modeling technique used and then analyzes the effects of two prominent market impediments identified in the WQT literature: information levels and trading ratios. The results imply that if market designers feel that only a limited number of trades will be consummated, creating an institution that provides accessible information about buyers’ prices is preferred to providing information about sellers’ prices. Overall, more information is always better, but it becomes less important with higher trading ratios.
Nishigaki, Tomohiro. "Improvement of Water- and Nutrient-Use Efficiency with Optimum Agricultural Management Practices in Upland Cropping Systems in Morogoro, Tanzania." Kyoto University, 2017. http://hdl.handle.net/2433/228243.
Повний текст джерелаRees, Gwendolen Jayne. "Two analyses of costs of agricultural NPS pollution: Transactions costs of expanding nutrient trading to agricultural working lands and Impacts of TCs and differential BMP adoption rates on the cost of reducing agricultural NPS pollution in Virginia." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/52939.
Повний текст джерелаMaster of Science
Spangler, Jonathan Travis. "An Assessment of Floating Treatment Wetlands for Reducing Nutrient Loads from Agricultural Runoff in Coastal Virginia." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86656.
Повний текст джерелаMaster of Science
Cowan, Watts Cara Ailene. "Critical review of us environmental protection agency numerical nutrient criteria with respect to culturally significant waters as a designated use." Thesis, Oklahoma State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10163015.
Повний текст джерелаThe Cherokee Nation, a Federally-recognized Tribal government in Northeastern Oklahoma lacks Tribal water quality standards for numerical nutrient standards based on baseline conditions in the Cherokee Nation. Lotic waters are of special significance in Cherokee Nation culture and ceremonies. Three water quality standard priorities within the Tribe include defining Culturally Significant Waters as a designated use, identifying Culturally Significant Waterbodies and determining applicable numerical nutrient standards. Culturally Significant Water as a designated use was defined based on community surveys. Twelve rivers and streams were identified as a portion of the Culturally Significant Waters of the Cherokee Nation based on a tribal community survey using a Use Attainability Analysis. To address excess nutrients in the Cherokee Nation, a total phosphorus numerical nutrient criterion was determined using data for Culturally Significant Water bodies, literature guidance and the US Environmental Protection Agency recommended nutrient criteria process for the respective Aggregate Nutrient Ecoregion. The Oklahoma Scenic Rivers criterion of 0.037 mg/L total phosphorus for a 90-day geometric mean was evaluated and determined not to be protective of Cherokee Nation’s Culturally Significant Waters. A total phosphorus criterion of 0.016 mg/L was recommended to protect Cherokee Nation Culturally Significant Waters from benthic algae greater than 100 mg/m2 Chlorophyll a.
Saltos, Theodore Nicholas. "Assessment of Agricultural Nutrient Pollution to Lake Erie from the Maumee and Sandusky Watersheds: Analyzing Trends in Hydrology, Nutrient Loading, and Policy Using a Statistical Approach." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531928517302473.
Повний текст джерелаWang, Lei. "Developing an integrated catchment-scale modelling approach for supporting the sustainable management of water nutrient pollution from diffuse agricultural sources." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54893/.
Повний текст джерелаTwombly, Cameron Robert. "Edge-of-Field Hydrology and Nutrient Fluxes within Northeastern Agroecosystems: Evaluation of Alternative Management Practices and Water Quality Models." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1170.
Повний текст джерелаAgeson, Karen. "Agricultural nutrient management employing the concept of ecological goods and services : a valuation of ground water quality in Abbotsford, British Columbia." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38630.
Повний текст джерелаSchaible, Candace J. "Assessing Homeowners' Lawn Management Practices and Preferred Sources of Educational Information." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7041.
Повний текст джерелаGildow, Marie C. "Evaluating Fertilizer Application Practices to Reduce Phosphorus Discharge from the Maumee River." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437400849.
Повний текст джерелаVargas, Filipe Marcel da Rosa. "Deposição de serrapilheira e ciclagem de nutrientes em Pinus taeda L. em sistema silvipastoril." Universidade Tecnológica Federal do Paraná, 2011. http://repositorio.utfpr.edu.br/jspui/handle/1/455.
Повний текст джерелаThis work aimed to study the cycling of nutrients via litterfall in Pinus taeda in silvopastoral system, by quantifying the contribution of litter, the decomposition rate and this the return of nutrients (N, P, K, Ca and Mg ) as a function of spacing and sampling position. The deposition of litter in conventional forest planting density is higher than at low planting densities, used in integrated production systems. Although the deposition unit is smaller, the greater the density of planting. The period of the year in which there was greater deposition of leaf litter was the month of April, with the exception of the plant row at a density of 1,111 trees ha-1, which was in May. There was an interaction between plant density, distance from the plant line and time for the release of all macronutrients in the system, as well as for the C / N.
OLIVEIRA, David Castor Maxwel. "Avalia??o de um sistema agroflorestal com a?a?, mogno africano e leguminosas arb?reas implantado h? 10 anos em Serop?dica, RJ." Universidade Federal Rural do Rio de Janeiro, 2016. https://tede.ufrrj.br/jspui/handle/jspui/1835.
Повний текст джерелаMade available in DSpace on 2017-06-26T19:35:59Z (GMT). No. of bitstreams: 1 2016 - David Castor Maxwel de Oliveira.pdf: 6489134 bytes, checksum: 23e02124d5d66aa42a02e4375f4e0862 (MD5) Previous issue date: 2016-10-24
Agroforestry systems (ASF) are potentially characterized as a agroecological crops by the similarity to the forest structure and function which gives more sustainability to the production systems, making them environmentally friendly. This study evaluated an AFS ten years plantation to obtain information about the nitrogen fixing legumes influenced over the soil chemical properties, the palm heart production, the Khaya ivorensis A. Chevalier and Euterpe oleracea Mart. Growth, and finally the common beans cultivation. The AFS was located at Embrapa Agrobiologia Experimental field, at Serop?dica city, Rio de Janeiro state. The statistical was randomized blocks with 5 treatments and 4 replications with 9 m x 9 m plots and total area with 1.620 m2. There were E. oleraceae, planted in a 3 m x 3 m spacing with one plant of K. ivorensis at the plot center. The treatments were different kinds of green manure crops between the lines such as: Acacia angustissima (Mill.) Kuntze; Gliricidia sepium (Jacq.) Steud;. Canavalia ensiformis (L.) DC, nitrogen fertilization with castor cake and spontaneous vegetation. For the soil fertility analyses were collected two samples, one before and other after green manure crops management. K. ivorensis and E. oleraceae biometry, also heart palm production were harmed by inappropriate management on cultivation care lack between post planting and this evaluation lapse. These commercial crops reached larger diameters and superior height at the plot without leguminous crops competition. Green manure crops were efficient in soils nutrients cycling, increasing the most elements content after pruning the leguminous plants and the application of the biomass over the ground. Extract nodules inoculation showed capacity to increase nodulation and nitrogen content in common beans plants, but didn?t increase the grain production.
Os sistemas agroflorestais (SAF) podem ser configurados como cultivos agroecol?gicos, onde a similaridade com as florestas em estrutura e fun??o confere ao sistema uma maior sustentabilidade, tornando-os ambientalmente adequados. Este estudo avaliou um SAF com 10 anos de implanta??o, gerando informa??es sobre quanto as culturas de leguminosas fixadoras de nitrog?nio influenciaram nas propriedades qu?micas do solo e na produ??o do sistema, quantificando a produ??o de palmito, o crescimento de plantas de Khaya ivorensis A. Chevalier e Euterpe oleracea Mart. plantados e o cultivo de feij?o. O experimento estava localizado no Campo Experimental da Embrapa Agrobiologia, no munic?pio de Serop?dica, do Rio de Janeiro. O delineamento experimental adotado foi o de blocos ao acaso com cinco tratamentos e quatro repeti??es, com parcelas de 9 m x 9 m cada, totalizando 1.620 m2. Em todos os tratamentos existiam a?a?s plantados de 3 m x 3 m ao longo de todas as parcelas que tamb?m continham um mogno africano no centro de cada uma. Os tratamentos foram compostos por aduba??es verdes nas entrelinhas dos a?a?s, constitu?dos por Acacia angustissima (Mill.) Kuntze; Gliricidia sepium (Jacq.) Steud.; p aduba??o nitrogenada de cobertura com torta de mamona e o controle com vegeta??o espont?nea. Para avalia??o qu?mica do solo foram feitas duas coletas, uma antes e outra p?s manejo da biomassa vegetal. Foi realizada a biometria das plantas de mogno africano, de a?a?, e a quantifica??o da produ??o de palmito, onde foi poss?vel perceber que essas culturas tiveram o crescimento prejudicado devido a falta de manejo, tendo em vista que houve menos competi??o nas parcelas sem leguminosas arb?reas, onde essas culturas de interesse atingiram maiores di?metros e alturas, refletindo da mesma forma na produ??o de palmito. A aduba??o verde foi eficiente na ciclagem de nutrientes do solo, aumentando o teor da maioria dos elementos ap?s um manejo e superando vegeta??o espont?nea al?m de ter beneficiado a produ??o do feijoeiro. A inocula??o com extrato de n?dulos ? capaz de aumentar a nodula??o e o teor de nitrog?nio da parte a?rea do feijoeiro, por?m n?o aumentou a produ??o de gr?os.
Miller, Kayla Marie. "Vegetating Shallow Field Ditches in the Paulding Plains of the Western Lake Erie Basin for Improved Water Quality." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483622025510358.
Повний текст джерелаNorton, Elbert Randall. "Nutrient and crop management studies in irrigated cotton production systems." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/279773.
Повний текст джерелаFischer, Peter. "The degree of phosphorus saturation of agricultural soils in Brazil and Germany: New approaches for risk assessment of diffuse phosphorus losses and soil phosphorus management." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19589.
Повний текст джерелаDiffuse phosphorus (P) losses from agriculture contribute to the eutrophication of surface waters. The degree of P saturation (DPS) is an established parameter for assessing the risk of P loss from agricultural soils. A soil type-independent approach for estimating the DPS by a simple standard method of water-soluble phosphorus (WSP; the WSP-DPS approach) was developed on European soils. In the thesis, the WSP-DPS approach was for the first time: i) tested on tropical soils and ii) used to derive P loss risks from soil P monitoring data and from recommended soil P levels by agricultural institutions. In addition to DPS, laboratory analyses and field studies were combined to assess the risk of P loss associated with the superficial application of inorganic fertilizer, which is commonly used in Brazil. The soil type-independency of the WSP-DPS approach was confirmed for soils of Brazil. Infrared spectroscopic analyses provided an explanation for the relatively low dissolved P concentrations in the surface runoff of Oxisols. Pedotransfer functions were determined between WSP and methods used to estimate plant-available P in Brazil and Germany and allowed for the transformation of soil P monitoring data into DPS values. The first DPS maps revealed relatively low P loss risks for the investigation area in Brazil and high risks for Germany. This difference was partly explainable by the recommended soil P levels in the two countries. To consider both agricultural production and the protection of surface waters in soil P management with a simple and cost-effective method, the soil test methods of using water and CaCl2 to estimate plant-available P and the WSP-DPS approach were combined. This approach could help to solve the challenges humanity faces regarding P in agriculture in the coming decades: An efficient use of the limited resource P and the protection of surface waters from diffuse P losses.
Avila, João Eduardo Tombi de. "Caminhos para a transição agroecológica : estudo com uma família do assentamento Fazenda Ipanema, Iperó (SP)." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/130.
Повний текст джерелаMany farmers consider Agroecology a tool to produce sustainably. By changing their production systems, changing crops and inputs applied, aiming at a sustainable system, the family farmer search a transition agroecology. However, few among them can produce or advance in agroecological transition. A reason for this difficulty may be related to biomass production in quantity and quality to ensure the agroecosystems sustainability. The family agroecosystems tend to have greater biodiversity than large farms due to a tendency to polycultures, self, family pluriactivity, among other strategies. In this local biodiversity, plants play a key role and can be considered co-products. This study aimed to characterize a unit of production and family life (UPVF) adopting management practices aimed at agroecological transition, to discuss the importance of plant biomass in this transition process and to propose alternatives to achieve the fertility system. The research was developed at Iperó in Ipanema Farm settlement in the State of Sao Paulo. The UPVF studied occupies a plot of eight hectares and is divided into seven sectors of production. The family with whom this work was developed live in the settlement since 1992. The research aimed to detail the system features and the complexity of relationships in order to describe and analyze a case study setting. It was found that the biomass produced in UPVF did not meet the nutritional demand of the main sector of commercial product, the banana orchard. The proposed redesign sought to ally virtuous experiences and scenic beauty, attractive for humans. Thus, the UPVF redesign aimed at promoting the cradle areas of fertility, assisted in the production of plant biomass in abundance and quality (diversity), preferably in well accessible, as the surrounding residences, places of daily traffic and nearby areas containment of animals. Thus, it is expected to 16 contribute to the sense of pride in the family for the successful transformation of the local landscape and the awareness of what it represents.
Muitos agricultores familiares consideram a Agroecologia a base para se produzir de forma sustentável. Com base nos princípios agroecológicos, alguns deles alteram seus sistemas produtivos, modificam os cultivos e os insumos aplicados. Entretanto, poucos conseguem produzir ou avançar no sentido de obter uma produção sustentável, em termos ambientais e econômicos. Entre os possíveis fatores que dificultam essa transição agroecológica constata-se a dificuldade para produzir biomassa em quantidade e qualidade que garanta a sustentabilidade desses agroecossistemas. Os agroecossistemas familiares tendem a apresentar maior biodiversidade em relação às grandes propriedades rurais em função da tendência aos policultivos, autoconsumo, pluriatividade familiar, entre outras estratégias. Dentro dessa biodiversidade local, os vegetais desempenham um papel fundamental e podem ser considerados coprodutos da unidade produtiva. Esta pesquisa teve por objetivos caracterizar uma unidade de produção e vida familiar (UPVF) que adota práticas de manejo visando a transição agroecológica e propor alternativas de manejo para aumentar a produção de biomassa vegetal nesse processo de transição. A pesquisa se desenvolveu em Iperó, no assentamento Fazenda Ipanema, no Estado de São Paulo. A UPVF estudada ocupa um lote de oito hectares e está dividida em sete setores de produção. A família com quem se desenvolveu este trabalho vive no assentamento desde 1992. A pesquisa buscou detalhar as especificidades do sistema e a complexidade das relações, de forma a descrever e analisar a UPVF escolhida, estabelecendo um estudo de caso. Constatou-se que a biomassa produzida na UPVF não atendeu à demanda nutricional do principal setor de produção comercial do lote, o pomar de bananeiras. O redesenho proposto buscou aliar experiências bem sucedidas e beleza paisagística, um 14 atrativo para os seres humanos. Assim, o redesenho da UPVF teve por meta favorecer as áreas berço de fertilidade, apoiadas na produção de biomassa vegetal em abundância e qualidade (diversidade), de preferência, em locais bem acessíveis, como o entorno das residências, locais de trânsito diário e proximidades das áreas de confinamento dos animais. Dessa forma, espera-se contribuir para o sentimento de orgulho na família pelo êxito na transformação da paisagem local e a consciência do que ela representa.
Lister, James Edward. "The behaviour of plant nutrients in colliery spoil of Central Scotland." Thesis, University of Glasgow, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335480.
Повний текст джерелаSarikaya, Ebru. "Agricultural Reuse Of Water And Nutrients From Wastewater Treatment In Izmir Region." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614337/index.pdf.
Повний текст джерелаKing, Ben Peter. "Identification and quantification of medium-term sediment storage within agricultural catchments." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312286.
Повний текст джерелаDePrator, Francesca Victoria. "Innovation Among Nutrient Service Providers in the Midwest." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525717706908821.
Повний текст джерелаWalworth, James, and David M. Kopec. "Aquatrols Surfactant Study on Turfgrass Nutrient Uptake." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/216541.
Повний текст джерелаFarthing, Tessa. "Impact of a Forested State Park on Nutrient Concentrations in an Agriculturally Dominated Watershed in Southwest Ohio." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1626999681372348.
Повний текст джерелаMehramiz, Mohammad Reza. "Nutrient contents of three Atriplex species (Atriplex cancensces, atriplex linearis and Atriplex polycarpa) under different management practices and site conditions." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282667.
Повний текст джерелаHaddad, Ola. "Soilless Cultivation of Edible Plants for Phytoremediation." Thesis, Stockholms universitet, Institutionen för naturgeografi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-185047.
Повний текст джерелаE, Xinyi. "Nutrients Recycling Strategy for Microalgae-based CO2 Mitigation System." UKnowledge, 2013. http://uknowledge.uky.edu/bae_etds/20.
Повний текст джерелаDantas, Mendes Lipe Renato. "Long term assessment of created wetlands functioning within agricultural areas." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-17139.
Повний текст джерелаWilson, Thomas Bachman. "Nutrient dynamics and fire history in mesquite (Prosopis spp.)-dominated desert grasslands of the southwestern United States." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279975.
Повний текст джерелаSoupir, Michelle Lynn. "Release and Transport of Bacteria and Nutrients from Livestock Manure Applied to Pastureland." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34471.
Повний текст джерелаTransport of fecal bacteria and nutrients from point and nonpoint sources to surface water bodies is of significant concern in Virginia and the United States. In Virginia, 4,320 river miles are impaired for one or more beneficial use and 72% of the streams are impaired due to pathogen indicators (VDEQ, 2002). Land applications of manure from confined animal systems and by direct deposit by grazing animals are both major sources of fecal bacteria and nutrients in runoff. Therefore, an understanding of the overland transport mechanisms for fecal bacteria and nutrients is very important for the development of best management practices to reduce loading of pathogens and nutrients to surface water bodies. The objectives of this study were to quantify the release and transport potential of three fecal bacterial indicators: E. coli, Enterococcus, and fecal coliforms; and nitrogen and phosphorus from land applied manure during runoff events. Another objective was to identify the Enterococcus species present in dairy manure and determine which species have the highest potential to be transported by runoff.
Release plots were established to study the in-field bacteria and nutrient release. The bacteria and nutrients released from the plots are available to be transported to the edge of the field in runoff. Four manure treatments (turkey litter, liquid dairy manure, cowpies, and none or control) and three land type treatments: pasture with a history of poultry litter application (Turkey Farm), pasture with a history of liquid dairy manure application (Dairy Farm), and pasture with no prior manure application (Tech Research Farm) were studied. During a short but intense rainfall event, the highest bacterial release was measured under the cowpie treatment (E. coli concentrations ranging from 37,000 to >300,000 and FC concentrations ranging from 65,000 to >300,000). Pasturelands with a history of previous manure applications did not release higher bacteria concentrations compared with pasturelands which had never received manure applications. Pasturelands with a history of land application of liquid dairy manure and turkey litter had 143% and 94% higher TSS concentrations available to be transported off the field during overland flow events because of the build up of organic material on the soil surface. TP concentrations released from the cowpie, liquid dairy, and turkey litter treatments were 3.12 mg/L, 3.00 mg/L, and 1.76 mg/L, respectively.
Transport plots were developed to measure the concentrations of fecal bacteria and nutrients present in overland flow at the edge of the field. The bacteria flow-weighted concentrations were highest in runoff samples from the plots treated with cowpies (200,000 CFU/100 mL of E. coli and 234,000 CFU/100 mL of FC). The turkey litter had the highest concentration of dissolved phosphorus in runoff from pasturelands (1.22 mg/L), but the cowpie treatment had the highest concentrations of sediment bound phosphorus in runoff (0.73 mg/L). All three treatments investigated in this study contributed to phosphorus loading in surface waters and could potentially increase the risk of eutrophication. Total nitrogen concentrations from the transport plots exceeded the threshold for likely eutrophication problems for all treatments and the total nitrogen concentrations from plots treated with cowpies exceeded the threshold for severe eutrophication problems.
The Biolog System, a method of bacterial source tracking, was used to identify the different species of Enterococcus present both in the cowpie source manure and in the runoff collected from the transport plots treated with cowpies. The source manure is dominated by the Enterococcus mundtii (55%), Enterococcus gallinarum (20%), Enterococcus faecium (10%), and Enterococcus faecalis (10%). Enterococcus faecalis had the highest percentage of isolates present in runoff with a total of 37%, followed by Enterococcus mundtii which was present in 21% of the runoff events and Enterococcus gallinarum and Enterococcus faecium (11%).
Improvements in understanding the bacterial release and overland processes will enhance modeling of bacteria and nutrient transport, and provide a basis for a more realistic evaluation of the impacts of management practices implementation. The data from this study will serve as a baseline to model the release and transport of fecal bacteria and nutrients from agricultural watersheds to surface waters.
Master of Science
Brooker, Michael R. "Physical and Chemical Characterization of Self-Developing Agricultural Floodplains." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1513778530623727.
Повний текст джерелаJoubert, Jorika. "The effect of different water and nutrient management strategies on the calcium content in apple fruit." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/395.
Повний текст джерелаWilliams, Rachel. "Effectiveness of Biochar Addition in Reducing Concentrations of Selected Nutrients and Bacteria in Runoff." UKnowledge, 2016. http://uknowledge.uky.edu/bae_etds/40.
Повний текст джерелаWiborgh, Hanna. "Where do the nutrients come from? : A case study from the agricultural landscape of Sibou village." Thesis, Stockholms universitet, Institutionen för naturgeografi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-126479.
Повний текст джерелаGALAMINI, Giulio. "Natural zeolitites in combination with struvite precipitation technology for the recovery of nutrients from agricultural wastewaters." Doctoral thesis, Università degli studi di Ferrara, 2022. http://hdl.handle.net/11392/2486767.
Повний текст джерелаL' Organizzazione Mondiale della Sanità (WHO) ha sottolineato l'importanza di iniziare a percepire le acque reflue animali e umane, come “risorse” invece che “rifiuti”. Nonostante questo, l'80% delle acque reflue municipali prodotte a livello globale vengono ancora gettate nell'ambiente senza essere state sottoposte ad alcun trattamento. D'altra parte, anche l'utilizzo sconsiderato come fertilizzanti minaccia i sistemi ambientali, portando a inquinamento, a degrado del suolo e alla contaminazione delle acque. La questione riguardo a "come smaltire in modo efficiente le acque reflue " o, ancora meglio, "come migliorare il riciclaggio dei nutrienti negli agro-ecosistemi", rimane quindi un argomento cruciale, la cui soluzione è necessaria per garantire la sostenibilità delle attività umane. Una promettente tecnologia consiste nella precipitazione di struvite per il recupero di azoto (N) e fosforo (P) dal refluo, ma lo sbilanciamento tra gli ioni costituenti (Mg2+, NH4+ e PO43-) all’interno delle acque reflue, è uno dei problemi principali per la sua implementazione, in particolare rispetto al forte eccesso di NH4+ che tali materiali presentano. È quindi spesso necessario incrementare Mg2+ e PO43-, andando ad incidere sui costi di produzione e alterando la qualità del refluo trattato. La possibilità di recuperare in maniera controllata l'NH4+ in eccesso, prima della precipitazione di struvite, può potenzialmente aumentare l'efficienza di questa tecnologia, diminuendo considerevolmente la necessità nell’utilizzo di reagenti. È stato quindi studiato un processo di trattamento di acque reflue agricole che utilizza zeolititi naturali (rocce contenenti > 50% di minerali zeolitici) in combinazione con la precipitazione di struvite, per la rimozione e il recupero di N e P. Preliminarmente sono state caratterizzate le proprietà di adsorbimento di NH4+ della zeolitite (esperimento A). Lo studio è stato eseguito su un refluo da allevamento suinicolo, studiando l’effetto della granulometria del materiale tramite due diverse granulometrie: zeolitite granulare e micronizzata. La zeolitite micronizzata ha dimostrato di raggiungere capacità di adsorbimento più elevate, con una migliore stabilità rispetto alla temperatura. Questo materiale è stato scelto per l'esperimento B, dove sono state studiate diverse strategie di trattamento per il recupero di struvite da un digestato. Il trattamento prevedeva due fasi: nella prima fase è stata applicata la zeolitite micronizzata, sia naturale che arricchita in K+, per la riduzione controllata del carico di NH4+ del refluo. Nella seconda fase, sono stati testati 2 diversi rapporti molari (Mg:NH4:PO4) per la precipitazione di struvite, in particolare, una condizione di eccesso di NH4+ (MR1) e un'altra caratterizzata da Mg2+ in eccesso (MR2). I risultati dell'esperimento B hanno suggerito che la metodologia più promettente consiste nell'uso di zeolitite naturale, in combinazione con il rapporto molare MR1 (NZT-S MR1). Questo trattamento ha infatti mostrato maggiore efficienza nella rimozione dei nutrienti, per la precipitazione di struvite e una minore alterazione finale del refluo trattato. Il precipitato ottenuto era composto per l'89,9% da struvite, povero di metalli pesanti potenzialmente pericolosi, e con un contenuto di azoto totale pari al 3,5%.I materiali ottenuti (zeolititi cariche in NH4+, precipitati di struvite e il refluo trattato) sono potenzialmente utilizzabili in agricoltura come fertilizzanti/ammendanti.La metodologia proposta può essere applicabile a qualsiasi acqua reflua ricca in nutrienti, come le acque reflue municipali.