Tesis sobre el tema "Crop management practices"
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Silvertooth, J. C. "Cultural and Management Practices for Pima Cotton Production". College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/209590.
Texto completoDeryng, Delphine. "Simulating the effects of climate and land management practices on global crop yield". Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92347.
Texto completoLe réchauffement planétaire lié à l'émission croissante des gaz à effet de serre menace la production alimentaire mondiale. Une augmentation des températures ainsi qu'une modification des régimes de précipitations augmentent les risques de mauvaises récoltes à long terme. Toutefois, certaines pratiques agricoles, comme le choix du type de semence, les dates de semis, et l'irrigation permettent aux agriculteurs de s'adapter au mieux aux variations climatiques. Afin d'évaluer le rôle combiné du climat et des pratiques agricoles sur le rendement des cultures, un nouveau modèle agricole, PEGASUS 1.0 (Predicting Ecosystem Goods And Services Using Scenarios), a été développé. PEGASUS simule le rendement du maïs, du soja, et du blé de printemps à l'échelle mondiale. Cette thèse présente les méthodes utilisées pour développer le modèle, ainsi que son évaluation sur les données agricoles actuelles. Par ailleurs, la sensibilité du modèle à un réchauffement global de 2°C a été estimée. De manière générale, les résultats des simulations correspondant aux conditions climatiques actuelles sont satisfaisants. Ainsi, les dates de semence et de récolte simulées coïncident avec l'éventail des dates observées pour plus de 62% des surfaces cultivées, pour chacune des trois cultures. De plus, l'évaluation du rendement agricole calculé indique un coefficient de détermination, pondéré par la surface récoltée, égale à 0.81 pour le maïs, 0.63 pour le so ja, et 0.45 pour le blé de printemps. Les résultats des simulations correspondant à un réchauffement de la température montrent une réduction générale des rendements agricoles. Cependant, lorsque les dates de plantation et le choix du cultivar sont adaptés à la nouvelle température, les pertes sont réduites de 60 à 78%. Les variations de rendement agricoles ont été comparées par revenus économiques, démontrant que les pays les plus riches pourraient bénéficier$
Banda, Alefa. "Adoption and crop productivity impacts of sustainable agricultural and land management practices in Zambia". Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63232.
Texto completoDissertation (MSc Agric)--University of Pretoria, 2017.
African Economic Research Consortium
DAAD
Agricultural Economics, Extension and Rural Development
MSc (Agric)
Unrestricted
Muratore, Thomas Joseph Jr. "LONG-TERM LAND MANAGEMENT PRACTICES AND THEIR EFFECT ON SOIL HEALTH AND CROP PRODUCTIVITY". UKnowledge, 2019. https://uknowledge.uky.edu/pss_etds/115.
Texto completoPalmer, Carol. "Reconstructing and interpreting ancient crop management practices : ethnobotanical investigations into traditional dryland farming in northern Jordan". Thesis, University of Sheffield, 1994. http://etheses.whiterose.ac.uk/1809/.
Texto completoHuang, Xuewen. "Analysis of effects of soil properties, topographical variables and management practices on spatial-temporal variability of crop yields". Diss., Connect to online resource - MSU authorized users, 2008.
Buscar texto completoJordan, Daniel L. "IMPACT OF HIGH-INPUT PRODUCTION PRACTICES ON SOYBEAN YIELD". UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/36.
Texto completoMcHenry, Bailey Marie. "Balanced nutrition and crop production practices for the study of grain sorghum nutrient partitioning and closing yield gaps". Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32725.
Texto completoAgronomy
Ignacio Ciampitti
P. V. Vara Prasad
Mid-west grain sorghum (Sorghum bicolor (L.) Moench) producers are currently obtaining much lower than attainable yields across varying environments, therefore, closing yield gaps will be important. Yield gaps are the difference between maximum economic attainable yield and current on-farm yields. Maximum economic yield can be achieved through the optimization of utilizing the best genotypes and management practices for the specific site-environment (soil-weather) combination. This research project examines several management factors in order to quantify complex farming interactions for maximizing sorghum yields and studying nutrient partitioning. The factors that were tested include narrow row-spacing (37.5 cm) vs. standard wide row-spacing (76 cm), high (197,600 seeds haˉ¹) and low (98,800 seeds haˉ¹) seeding rates, balanced nutrient management practices including applications of NPKS and micronutrients (Fe and Zn), crop protection with fungicide and insecticide, the use of a plant growth regulator, and the use of precision Ag technology (GreenSeeker for N application). This project was implemented at four sites in Kansas during 2014 (Rossville, Scandia, Ottawa, and Hutchinson) and 2015 (Topeka, Scandia, Ottawa, Ashland Bottoms) growing seasons. Results from both years indicate that irrigation helped to minimize yield variability and boost yield potential across all treatments, though other factors affected the final yield. In 2014, the greatest significant yield difference under irrigation in Rossville, KS (1.32 Mg haˉ¹) was documented between the ‘low-input’ versus the ‘high-input’ treatments. The treatment difference in grain sorghum yields in 2014 was not statistically significant. In 2014, the Ottawa site experienced drought-stress during reproductive stages of plant development, which resulted in low yields and was not influenced by the cropping system approach. In 2015 the treatments were significant, and in Ottawa, narrow row spacing at a lower seeding rate maximized yield for this generally low-yielding environment (<6 Mg haˉ¹) (treatment two at 6.26 vs. treatment ten at 4.89 Mg haˉ¹). Across several sites, including Rossville, Hutchinson, Scandia, Topeka, and Ashland, a similar trend of narrow row spacing promoting greater yields has been documented. Additionally, when water was not limiting sorghum yields (i.e., under irrigation), a balanced nutrient application and optimization of production practices did increase grain sorghum yields (‘high-input’ vs. ‘low-input’; the greatest difference was seen in 2014 in Rossville, 1.2 Mg haˉ¹, and in 2015 in Ashland, 1.98 Mg haˉ¹). In the evaluation of nutrient uptake and partitioning in different plant fractions, there was variability across all site-years which did not always follow the same patterns as the yield, however, the low-input treatment was shown to have significantly lower nutrient uptakes across all the nutrients evaluated (N, P, K, S, Fe, Zn) and across most fractions and sampling times. The objectives of this project were to identify management factors that contributed to high sorghum yields in diverse environments, and to investigate nutrient uptake and partitioning under different environments and crop production practices.
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.
Texto completoSebetha, Erick Tshivetsi. "Evaluation of yield and protein content ot two cowpea cultivars grown under diferent management practices". Thesis, University of Limpopo, 2009. http://hdl.handle.net/10386/579.
Texto completoField experiments were conducted at the University of Limpopo experimental farm, Syferkuil during 2005/06 and 2006/07 production seasons. This was initiated to examine the effect of leaf removal on cowpea biomass, protein content and grain yield under sole and binary cultures. Treatments consisted of cowpea varieties (Pan 311 and Red caloona), cropping systems (sole and intercropping) and cowpea-leaf pruning regimes (pruning and un-pruned). Sweet corn was planted, as a component crop in the intercropped plots while sole sweet corn plot was included as a treatment. All treatment combinations were laid out as Randomize complete block design (RCBD) with four replicates. Supplementary irrigation was carried out during the plant growth period. Fully expanded leaves were harvested once on all cowpea plants in the two middle rows from designated plots at seven weeks after planting for each year. Growth and yield data were collected from component crops during the course of the trial while the protein content of harvested leaves and immature pods as well as the different cowpea plant parts at harvest were determined. Results of the study revealed that leaves of cowpea variety, Pan 311 harvested prior to the reproductive stage had significantly higher protein content than those of Red caloona. Protein content of immature Pan 311 pods had higher (18.8 to 25.1%) than Red caloona (17.9 to 20.7%) during both planting seasons. The percent protein content of cowpea stem obtained at harvest for Pan 311 varied between 9.3 and 9.4%, and between 9.9 and 12.3% for Red caloona during both planting seasons. Grain yield obtained for Pan 311 and Red caloona were 1703.7 kg ha-1 and 1479.8 kg ha-1, respectively during 2005/06 and 1290.7 kg ha-1 and 511.7 kg ha-1 respectively during 2006/07 planting seasons. Sweet corn intercropped with Red caloona during both planting seasons had higher average grain yield than when intercropped with Pan 311. Although intercropping decreased the partial land equivalent ratio (LER) value of individual component crops, the combined LER values of between 1.1 and 2.3 under intercrop for the different treatment combinations implies that the practice is advantageous. The results of post harvest soil analyses revealed that topsoil has the pH value of 7.11-7.29 indicating neutral soil while subsoil pH value of 6.27-6.91 indicated slightly acidic to neutral soil during both planting seasons. Based on the findings of this study, cowpea variety Pan 311 can be recommended as a better vegetable crop than Red caloona since it has higher leaf and immature pod protein content. It also had higher grain yield than Red caloona when intercropped with sweet corn. Sweet corn had high grain yield when intercropped with Red caloona than when intercropped with Pan 311. Keywords: Cropping systems, protein content, grain yields, leaf pruning and cowpea.
Georgis, Kidane. "The effect of fertiliser management practices on soil organic matter production in the semi-arid areas : a field and modelling approach". Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09AFP/09afpg352.pdf.
Texto completoBalayara, Assa. "An Invasive Fruit Fly, Bactrocera dorsalis (Tephritidae), on Mango in Senegal: Impact on Mango Crop Production and Value, Marketing Practices, and Management". Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81513.
Texto completoMaster of Science in Life Sciences
Stark, Christine. "Effects of long- and short-term crop management on soil biological properties and nitrogen dynamics". Phd thesis, Lincoln University. Agriculture and Life Sciences Division, 2005. http://theses.lincoln.ac.nz/public/adt-NZLIU20070220.010748/.
Texto completoStark, Christine H. "Effects of long- and short-term crop management on soil biological properties and nitrogen dynamics". Lincoln University, 2005. http://hdl.handle.net/10182/30.
Texto completoDam, Rikke Friis. "Impacts of long term tillage and residue practices on selected soil properties". Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78344.
Texto completosanguankeo, paolo. "IMPACT OF WEED MANAGEMENT PRACTICES ON GRAPEVINE GROWTH, YIELD COMPONENTS, PLANT AND ARTHROPOD ABUNDANCE, AND CARABID SEED PREDATION IN PASO ROBLES VINEYARD". DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/168.
Texto completoMonteiro, José Eduardo Boffino de Almeida. "Microclima e ocorrência de ramulose no algodoeiro em diferentes densidades populacionais". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11131/tde-12032003-145150/.
Texto completoWith the goal of evaluating the microclimate and the occurrence of ramulose (Colletotrichum gossypii South. var. cephalosporioides Costa) in cotton (Gossypium hirsutum L. var. latifolium Hutch.) crop with different population densities, it was conducted an experiment with the genotypes IAC 23 and Coodetec 401, in the spacing of 0.9m between lines and with 5, 10 and 15 plants per meter in the planting line, performing a total of six treatments, subdivided in areas, inoculated and not inoculated with the pathogen. The air temperature, measured within the crop canopy was significantly different from the measure obtained at 2m in a weather station but it was not significantly different among densities. The relative humidity increased with the crop density and was larger at the crop level than at the weather station. However, the difference among densities occurred in the initial phase of development, being minimized with the crop growth. The wetness period presented variation similar to the relative humidity, however, with larger differences between densities. At 30 days after emergence of seedlings (DAE), wetness period was 9.4, 10.2 and 11.7h, respectively, in the densities of 5, 10 and 15 plants per meter. At 45 DAE, wetness period was 11.2, 12.3 and 13.6h, at the same densities, respectively. There was huge difference of disease intensity between genotypes but there was no difference between the three densities, even occurring significant differences in the microclimate. This was attributed to the macroclimatic conditions which were widely favorable to the pathogen during the experiment period. The area under disease progress curve (AUDPC) in the inoculated areas was, on the average, 108 units in the genotype IAC 23 and 238 units in Coodetec 401. In the not inoculated areas, it was 52 and 61 units, respectively. The duration of the leaf area (DAF) between 0 and 150 DAE, in the densities of 5, 10 and 15 plants per meter was, respectively, 351, 502 and 645 LAI.day in the genotype IAC 23, without difference between inoculated and not inoculated areas. In the genotype Coodetec 401, DAF was 276, 482 and 606 LAI.day in the not inoculated areas, occurring reduction of 8%, 22% and 20% in the inoculated ones. There was no difference in the cotton yield between densities. In the genotype IAC 23 the yield was 0.42Kg.m -2 in the not inoculated areas and 0.36Kg.m -2 in the inoculated ones. In the genotype Coodetec 401, the yield was 0.44Kg.m -2 in the not inoculated areas and 0.24 Kg.m -2 in the inoculated. With the daily evaluation of the microclimate conditions it was possible to identify a favorable period to the pathogen infection, which preceded an explosive increase of the disease incidence, near to 87 DAE, which was characterized for a period with smaller nocturnal temperatures, under 14ºC what increases the predisposition degree of the cotton to diseases followed by days with high air relative humidity and wetness period.
Simon, Lena. "Le microbiome du sol : contrôle de Fusarium graminearum et transmission à l'environnement racinaire du blé sous l'effet de déterminants environnementaux et agronomiques". Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2024. http://www.theses.fr/2024UCFA0027.
Texto completoReducing the use of phytosanitary products constitutes one of the major axes of the agroecological transition. In this context, it is urgent to develop strategies ensuring effective and sustainable management of parasitic pressure, while preserving the environment. Mobilization of the soil microbiome, and particularly the bacterial community, represents one of these solutions. Although it has been demonstrated that part of these communities is capable of limiting the impact of crop pathogens, the relationships between the environment of the microbiome and its capacity to regulate plant diseases still remain largely unknown. The ambition of this thesis project was to evaluate the impact of factors, such as soil conditions and agricultural practices, on the structure and functioning of the soil microbiome and to analyze the relationship between these modifications and the capacity of the microbiome to participate in the regulation of Fusarium head blight. This project is structured around two axes of research, aiming to (1) determine which factors explain the suppressive nature of soils with respect to the pathogen Fusarium graminearum, and (2) evaluate the influence of the environment on the assembly of the soil and wheat microbiome. To meet these objectives, a network of 103 plots in the Limagne plain (Puy-de-Dôme, France) was mobilized. The plots represented a diversity of soil types and agricultural practices, and were divided into either intensive agriculture, organic agriculture, or soil conservation agriculture. Soil samples were taken from each plot and characterized by (1) agricultural practices (2) physicochemical analyses, (3) their bacterial community by metabarcoding of the 16S rDNA gene and (4) in vitro inhibition tests (fungistasis) of the pathogenic fungus Fusarium graminearum. Among these 103 plots, 98 were used to collect samples of wheat (Triticum aestivum) rhizosphere and roots, that were also described through their bacterial community. Finally, nine soils among the 103 were selected for the cultivation and infection of wheat by F. graminearum under controlled conditions. The fungistasis test revealed great variability within the sample as well as the ability of certain soils to completely inhibit the germination of the fungus. Perennial soil characteristics and bacterial diversity were related to soil fungistasis. There was also a correlation between the abundance of Burkholderia spp. and fungistasis. Comparison of bacterial microbiomes from soil, wheat rhizosphere and roots revealed different compositions between the three compartments. The microbial composition in the soil influenced those of the rhizosphere and roots of the same plot. The physicochemical characteristics and the management system influenced the composition of the bacterial community in the three compartments. Experimentation under controlled conditions did not reveal a link between microbiome (diversity and composition) and symptoms of Fusarium head blight, nor a link between fungistasis and in planta symptoms on the same soil. Overall, this work contributes to evaluating the possibilities of using agricultural practices as a lever for agroecological control of Fusarium head blight in wheat, through the modulation of natural microbial communities
Bampa, Francesca. "Options for climate change mitigation in agricultural soils and impact on crop and grassland production: a multi-scale study". Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424061.
Texto completoLa ridotta fertilitá dei suoli è riconosciuta dall’Unione Europea (UE) come preludio di una minore produttivitá delle aree agricole. La Strategia tematica del suolo, prodotta dalla Commissione Europea nel 2006, aveva identificato il declino della sostanza organica come una delle otto principali minacce dei suoli in UE, in quanto il contenuto di carbonio organico è un indicatore della qualitá dei suoli. Molti studi si sono concentrati su esperimenti a lungo termine a taglio locale. Questo lavoro ha un approccio diverso: a partire da dati ed informazioni a livello UE viene indagato un caso studio a taglio regionale. L’obiettivo generale di questo lavoro è valutare e quantificare quali sono le pratiche agricole piú promettenti nel preservare o sequestrare carbonio organico nei suoli dell’UE. La tesi è strutturata in cinque capitoli: il primo è un’introduzione generale sulla necessitá di preservare il carbonio organico presente nei suoli agricoli e una review della legislazione disponibile a livello internazionale ed Europeo. Il secondo capitolo indaga e confronta i dati disponibili sui livelli di carbonio nel suolo a livello UE. Il terzo è una meta-analisi su dati in letteratura sulla capacitá di sequestrare carbonio da parte delle pratiche agricole utilizzate dei suoli dell’UE. Nel quarto capitolo viene applicato il modello CENTURY a livello regionale per ricostruire i valori di stock di carbonio organico attuali e modellare l’applicazione di pratiche agricole promettenti in due diversi scenari climatici. Infine, l’ultimo capitolo riporta le conclusioni generali del lavoro e alcune linee guida.
Robin, Marie-Hélène. "Analyse et modélisation des effets des pratiques culturales et de la situation de production sur les dégâts causés par les bioagresseurs des cultures. Application au blé d’hiver". Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2014INPT0067/document.
Texto completoIntegrated pest management (IPM) appears as a sustainable strategy to protect plants against pest while answering the economical, ecological, and toxicological expectations that agriculture must face. The effects of cultural practices on pest dynamics have to be thoroughly analyzed in order to reduce the reliance of cropping systems on pesticides. A model, named IPSIM ((Injury Profile SIMulator), currently under development in this thesis, aims at simulating the effects of cropping practices, as well as soil, climate and field environment on the injuries caused by multiple pests of a given crop. This model is based on a hierarchical and aggregative approach. This study describes the conceptual basis of the modeling and its applications in order to develop IPSIM-Wheat, a model simulating injury profiles on wheat. Thus, several models have been designed to predict six diseases, one insect pest and weeds. This study thus contributes to the development of IPSIM-Wheat which will help design innovative sustainable wheat-based cropping system
Silvertooth, J. C. "Practical Uses of Crop Monitoring for Arizona Cotton". College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/209588.
Texto completoShahar, Rotem. "Tools to advance row crop best management practice (BMP) implementation in Florida's Lower Suwannee River Basin". [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0022895.
Texto completoStall, Karen Marie. "Evaluation of Sedimentation Control as a Best Management Practice for Removing Copper-based Crop Protectants in Plasticulture Runoff". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32347.
Texto completoMaster of Science
Brichler, Kirsten Nicole. "Effects of Farm Management Practices on Pest Slugs and Slug Predators in Field Crops". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98469.
Texto completoMaster of Science in Life Sciences
Invasive slug species the gray field slug, Deroceras reticulatum (Muller), and the marsh slug, Deroceras laeve, are major pests of maize and soybean grown in Virginia no-till systems. Slug feeding causes injury to young plants that, when severe, can reduce crop yield and necessitate replanting a field. Chemical control options are limited, and farmers may not be willing to use tillage as a control measure. Conserving arthropod slug predators may suppress pest populations below economic levels. Research is needed to understand how farming methods such as tillage type (e.g., no-till, strip tillage, vertical tillage) and cover crop use affect slugs and their predators. Our study investigated 1) how tillage type and cover crop use affected slug and slug predators, 2) if certain farming practices and field characteristics can be used to predict slug injury, and 3) if slugs preferred feeding on commonly-used cover crop species when offered with maize or soybean seedlings. Commercial production fields with different combinations of no tillage or reduced tillage, and planted with or without cover crops, were sampled to evaluate how these farming practices affect slugs and slug predators. Shingle traps and frames were used before planting and during early plant growth stages to collect and identify slug species; pitfall traps were used throughout the growing season to collect and identify slug predator species. To determine if slug feeding risk could be predicted, a survey of commercial production fields in the Shenandoah area was conducted and used to identify factors, if any, that influence slug feeding. Laboratory assays were used to determine feeding preference by offering slugs opportunity to feed on leaf tissue from a maize or soybean seedling or a mature cover crop species. We found that tillage type and use of cover crops did not affect the abundance of slugs, but that they did influence predator populations. The highest number of total predators were found in fields with reduced tillage, cover crops, and no insecticide use prior to crop emergence. Harvestmen were potentially the most impactful slug predator in the region. Field surveys suggested that no tested factor or interaction of factors affected slug injury to plants in commercial fields. Finally, we observed that slugs fed differently on soybean and maize tissue depending on cover crop species present.
Asmah, Augustus E. "Vesicular-arbuscular mycorrhizal fungal infection in some tropical crops in relation to soil management practices". Thesis, University of Aberdeen, 1991. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU033750.
Texto completoAcquilano, Dayle Elizabeth. "A comparison of project management practices in academic research organizations (aros) and contract research organization (cros)". Thesis, Boston University, 2012. https://hdl.handle.net/2144/12257.
Texto completoWith the increased costs of drug development, pharmaceutical companies outsource most of drug development to contract research organizations (CROs) and academic research organizations (AROs). Given the importance of the relationship between the contracting organization and pharmaceutical companies, project management has become the hallmark in conducting clinical trials. The purpose of this project was to identify whether there are differences in the project management practices of CROs and AROs who conduct clinical trials. An electronic survey and follow up interview were administered to 134 CROs and 15 AROs who provide clinical trial services to pharmaceutical and biotechnology companies. The survey collected information on the characteristics of project managers, the organization demographics, and project management within the organization. The survey demonstrated significant differences between the services provided (p less than .001), (p=0.001), availability of project management standard operating procedures (SOPs), training of project managers (p less than 0.05), and salary of project managers (p=0.003). The overall response rate of the survey was 36%; thus, the full variance of project management practices may not have been obtained in this survey. These findings highlight some differences between AROs and CROs, and provide a foundation to learn more about project management at these organizations.
Ikazaki, Kenta. "Development of a Land Management Practice for Wind Erosion Control and Improvement of Crop Production in the Sahel, West Africa". Kyoto University, 2010. http://hdl.handle.net/2433/120464.
Texto completo0048
新制・課程博士
博士(農学)
甲第15421号
農博第1806号
新制||農||979(附属図書館)
学位論文||H22||N4520(農学部図書室)
27899
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 舟川 晋也, 教授 縄田 栄治, 教授 間藤 徹
学位規則第4条第1項該当
Sumani, John Bosco Baguri. "Exploring Perceptions of the Potential of Agricultural Insurance for Crop Risks Management Among Smallholder Farmers in Northern Ghana". Antioch University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1529494821429119.
Texto completoAnusontpornperm, Somchai. "Land evaluation using soil properties in relation to genesis and classification to make guidance on soil management for cassava crop practice". Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413676.
Texto completoKean, J. M. "Metapopulation theory in practice". Lincoln University, 1999. http://hdl.handle.net/10182/1372.
Texto completo(7479974), Michelle R. Hemler. "Understanding how crop insurance impacts adoption of conservation practices". Thesis, 2019.
Buscar texto completoSlawinski, Karl Ryan. "The effect of integrated management practices on crop and soil nutrient dynamics". 2010. http://hdl.handle.net/1993/29798.
Texto completoPasseira, Carolina Ramires. "Modelling carbon sequestration for alternative soil management practices of organic crop production". Master's thesis, 2012. http://hdl.handle.net/10216/68273.
Texto completoPasseira, Carolina Ramires. "Modelling carbon sequestration for alternative soil management practices of organic crop production". Dissertação, 2012. http://hdl.handle.net/10216/68273.
Texto completoDeryng, Delphine. "Simulating the effects of climate and land management practices on global crop yield". 2009. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92347.
Texto completoGraham, Martha Helena. "The effect of various crop residue management practices under sugarcane production on soil quality". Thesis, 2003. http://hdl.handle.net/10413/10163.
Texto completoThesis (Ph.D.)-University of Natal, Pietermaritzburg, 2003.
(9824864), Sushil Pandey. "Effects of soil health management practices on plant root development". Thesis, 2016. https://figshare.com/articles/thesis/Effects_of_soil_health_management_practices_on_plant_root_development/13387289.
Texto completoMcKeown, Steven. "Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR". Thesis, 2012. http://hdl.handle.net/10214/3901.
Texto completoBound, SA. "The impact of selected orchard management practices on apple (Malus domestica L.) fruit quality". Thesis, 2005. https://eprints.utas.edu.au/2492/1/Bound_thesis%5B1%5Dfront.pdf.
Texto completoMcCormick, Ian. "Long-term impacts of tillage, crop rotation and cover crop systems on soil bacteria, archaea and their respective ammonia oxidizing communities in an Ontario agricultural soil". Thesis, 2013. http://hdl.handle.net/10214/6616.
Texto completoOMAFRA Highly Qualified Personnel Program, NSERC
Panomtaranichagul, Mattiga. "The effects of tillage practices and crop rotation systems on soil properties and water use efficiency / by Mattiga Panomtaranichagul". Thesis, 1997. http://hdl.handle.net/2440/19048.
Texto completoxxxii, 301 p. : ill. (some col.) ; 30 cm.
Basic hypothesis is that improved water use efficiency of rainfed crops can be achieved by adoption of tillage and sowing practices and crop rotation systems which improve surface and subsurface soil structure to increase the accession of rainfall and availability of soil water.
Thesis (Ph.D.)--University of Adelaide, Dept. of Soil Science, 1997?
Panomtaranichagul, Mattiga. "The effects of tillage practices and crop rotation systems on soil properties and water use efficiency / by Mattiga Panomtaranichagul". 1997. http://hdl.handle.net/2440/19048.
Texto completoxxxii, 301 p. : ill. (some col.) ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Basic hypothesis is that improved water use efficiency of rainfed crops can be achieved by adoption of tillage and sowing practices and crop rotation systems which improve surface and subsurface soil structure to increase the accession of rainfall and availability of soil water.
Thesis (Ph.D.)--University of Adelaide, Dept. of Soil Science, 1997?
Kauffman, John M. "Investigating Cold Hardiness and Management Practices of Warm-season Putting Green Species in the Transition Zone". 2010. http://trace.tennessee.edu/utk_graddiss/811.
Texto completoLebea, Tebogo Johannes. "Tomato yield and early blight incidence in response to cultivar and irrigation management practices in the Giyani Municipality". Thesis, 2020. http://hdl.handle.net/10386/3349.
Texto completoTomato is a major vegetable crop produced in Limpopo province by subsistence and commercial farmers. Biotic and abiotic factors such as diseases and drought affect its productivity and yield negatively. The most economically important tomato disease in Limpopo is early blight, caused by Alternaria solani. Early blight affects tomato growing under stressful conditions such as drought. The main aim of this study was to evaluate water management in tomato production and its effect on tomato yield, early blight occurrence and severity under smallholder farming systems in Giyani. A survey study and field experiments on early blight occurrence and severity were conducted in the Greater Giyani municipality in Limpopo province. Firstly, a survey of early blight was conducted in tomato fields selected from three service centres namely Guwela, Hlaneki and Mhlava Willem. Twenty five potential tomato grower’s farms were randomly selected for survey based on the location and production management strategies. A second study was carried out by establishing field experiments at two farms in the same area, namely: A hi tirheni Mqekwa and Duvadzi farms. The experiments were laid out in a randomized complete block design (RCBD) in a split plot arrangement, with irrigation as the main plot treatment and tomato variety as the subplot treatment. Each treatment was replicated four times. The irrigation treatments consisted of full irrigation up to field capacity and deficit irrigation. The tomato varieties planted were HTX14, Rodade, STAR9006 and Commander, and were irrigated with a drip irrigation system. The overall survey results showed that Guwela s/c had high disease incidence and the lowest disease severity as compared to the other two service centers. The lowest disease incidence was observed at Hlaneki s/c whilst Mhlava willem s/c had the highest disease severity. The two water treatments (full and deficit irrigation) in both farms have shown no significant pairwise differences among xx the volumetric water content means. There was no significant difference (P≥0.05) in early blight disease severity in both farms. Results shows that, all tomato varieties did not differ significantly (P≥0.05) in yield observed between treatments at Duvadzi and A hi tirheni Mqekwa Farm. Deficit irrigation can be used effectively to produce high yields in tomato production provided the cropping season window does not coincide with the hottest time of the year. Full and deficit irrigation did not have influence on the early blight disease incidence on tomato plants. Key words: Alternaria solani; disease incidence; disease severity and drip irrigation
Prgomet, Iva. "Effect of innovative crop management practices on physiological, nutritional and phytochemical characteristics of almond tree (Prunus amygdalus L.) products and coproducts". Doctoral thesis, 2019. http://hdl.handle.net/10348/9591.
Texto completoA agricultura enfrenta sérios desafios, como as mudanças climáticas que contribuem para a escassez de água devido ao aumento da temperatura média, fenómenos irregulares como secas e inundações, crescimento da população que leva ao aumento do consumo de água e alimentos e, consequentemente, geram uma quantidade substancial de agro-residuos. A amêndoa (Prunus dulcis (Mill.) D.A. Webb) é o fruto seco mais produzido a nível mundial, seguindo a tendência crescente de procura de produtos resultantes da transformação da amêndoa devido às suas propriedades nutricionais serem reconhecidas como benéficas para a saúde. As espécies fruteiras cultivadas nas zonas semiáridas da bacia do mediterrâneo são grandemente afetadas pelas mudanças climáticas, existindo a necessidade de aumentar a sustentabilidade e competitividade do setor da amêndoa. Neste sentido, o objetivo geral desta Tese de Doutoramento foi delineado de maneira a dar um importante contributo para impulsionar a cadeia de produção de amêndoa nas zonas semiáridas, focando-se na sustentabilidade de subprodutos de amêndoa como fonte dos compostos bioativos, de forma a obter uma completa valorização destes produtos. Para tal, será necessário compreender o efeito de diferentes regimes hídricos no comportamento fisiológico e bioquímico da amendoeira de forma a melhorar a qualidade da amêndoa, sustentabilidade ambiental e viabilidade económica desta cultura em zonas semiáridas. Neste sentido, esta experiência consiste em tratamentos baseados na evapotranspiração da cultura (ETc): regime ideal de exigência de água T100 (aplicação de 100% de ETc); défice de irrigação T70 e T30 (aplicação de 70% e 35% de ETc, respetivamente); défice de irrigação controlado: T100-T35 (100% durante o desenvolvimento do fruto, reduzindo a aplicação para 35% de ETc durante a maturação); ausência de rega T0 (sequeiro); aplicação de caulino em árvores em sequeiro (T0caulino), durante as estações de 2015 e 2016, em amendoeiras da variedade 'Ferragnès', com 15 anos de idade, e localizadas no Norte de Portugal. O impacto dos tratamentos nos subprodutos da amêndoa, na qualidade do miolo e no comportamento fisiológico da árvore foi avaliado através da determinação de parâmetros fitoquímicos, microbiológicos, nutricionais, fisiológicos e bioquímicos. A extração dos compostos fenólicos de subprodutos da amêndoa foi otimizada com sucesso usando a Response Surface Methodology (RSM), onde se estudou a variação de pH, diferentes concentrações de solvente e de tempos de extração, com o objetivo de reduzir os subprodutos da amêndoa gerados quer na colheita, quer durante o processamento industrial. De forma a valorizar os subprodutos, foi estudada a sua composição fenólica em material proveniente de amendoeiras sujeitas aos diferentes regimes hídricos e durante os dois anos de estudo. Os resultados sugerem que a composição fenólica dos cascarões é mais influenciada pela dotação de rega, enquanto que na pelicula o maior efeito é obtido porano. No entanto, a síntese de compostos fenólicos individuais parece ser mais influenciada por ano. Estes resultados contribuem para o conhecimento sobre o efeito da rega e do ano na composição fenólica dos vários subprodutos, permitindo eleger as melhores práticas agrícolas que contribuirão para o incremento dos compostos bioativos. Os cascarões e a película da amêndoa exibiram ainda atividade antibacteriana contra estirpes bacterianas potencialmente patogénicas resistentes a múltiplos fármacos, mostrando um interesse potencial para estes subprodutos serem futuramente investigados e confirmados como agentes antibacterianos. Certamente, será um passo em direção a novas alternativas de valor acrescentado para estes resíduos agroindustriais. Relativamente à produção e à qualidade de amêndoa, a maior variabilidade foi observada entre anos, sendo que a produção diminuiu em média 70% entre 2015 e 2016, enquanto o stresse hídrico influenciou a qualidade. Mesmo que alguns parâmetros da qualidade da amêndoa aumente nas árvores não regadas, as diferenças na produção do segundo ano de estudos revelaram o principal problema dos amendoais de sequeiro nas zonas semiáridas: produção irregular quando em condições de campo não regadas. Por outro lado, a aplicação de caulino não conduziu a uma melhoria do estado hídrico das amendoeiras; e, apesar de apresentarem um comportamento similar às árvores não-regadas, o caulino não mostrou ser prejudicial. Ao abordarmos o objetivo de desenvolvimento de metodologias de monitorização da qualidade da amêndoa para ser usada na industrial alimentar, as regiões de near infrared (NIR) e mid infrared (MIR) foram avaliadas para produzir modelos quantitativos para a previsão de proteína bruta e conteúdo em aminoácidos no miolo de amêndoa. O melhor modelo de previsão foi obtido com o NIR e FTIR, que mostrou ser usado com sucesso na determinação do conteúdo em proteína e aminoácidos em amêndoas. Finalmente, em relação às respostas fisiológicas e bioquímicas aos tratamentos, todos os parâmetros foram influenciados pela redução de água de rega, contudo, as árvores não exibiram stresse hídrico severo, mas apenas stresse hídrico moderado. O encerramento estomático é a principal limitação à realização da fotossíntese na amendoeira. As diferenças observadas mostram a importância da água na produção de amêndoa comparativamente ao sequeiro. Dentro dos tratamentos da rega, os tratamentos da défice da rega não reduziram a produção e a qualidade geral comparativamente às plantas T100, não tendo um impacto negativo no desempenho global das amendoeiras.
Agriculture is facing serious challenges, from the climate change contributing to water scarcity due to higher average temperatures and uneven events of drought and floads, to the growing population what increases the water and food demand, and at the same time generates substantial amount of agro-waste. Almond (Prunus dulcis (Mill.) D.A. Webb) is the worldwide most produced tree nut as it is following the increasing trend in world demand for almond products, due to its nutritional properties being recognized as beneficial for health. As it is fruit species grown in semiarid areas of Mediterranean Basin that are greatly affected by changes in environmental conditions, there is an existing need for increased sustainability and competitivness of the almond sector. The overall objective of this Doctoral Thesis therefore is to contribute to boost the almond production chain in semiarid areas by different approaches, focusing on determination of the suitability of almond by-products for use as a source of bioactive compounds to gain a complete evaluation of the valorisation alternatives for almond by-products. Furthermore, it is aimed gaining a further insight in the agricultural management strategies by understanding the plant physiological and biochemical response, enhance almond quality, environmental sustainability and economical viability for almond production in semiarid areas. In that regard, the experiment consisted of treatments based on the crop evapotranspiration (ETc): optimal water requirement regime T100 (applying the 100% of ETc); deficit irrigation regimes T70 and T30 (applying the 70% and 35% of ETc, respectively); regulated deficit irrigation: T100-35 (100% ETc during fruit development, reducing the application to 35% ETc during fruit filling); rainfed T0 (rainfed); and kaolin application to rainfed trees (T0Kaolin), during 2015 and 2016 seasons, on 15-years old almond trees of variety ‗Ferragnès‘ located in Northern Portugal. The impact of treatments on almond by-products, kernel quality and plant behaviour, was assessed. To achieve this aim several actions were undertaken involving field trials and phytochemical, microbial, nutritional, physiological and biochemical approaches. To get new insights on reduction of agro-residues upon harvest and industrial processing, the phenolic extraction of almond byproducts was successfully optimized using the Response Surface Methodology (RSM) for the non-toxic, food grade ethanol pH, concentration and extraction time. To achieve further objectives of by-products valorisation, irrigation and seasonal variabilities were studied on the phenolic composition of almond by-products. The impact of irrigation treatments seasons differed among by-products, hulls being more influenced by irrigation and skins by season, while the synthesis of the most of individual phenolic compounds appeared to be more influenced by the season. These data further contributes to better understanding of seasonal and irrigation variability, this being relevant for the potential application of diverse agricultural practices to improve bioactive content. Almond hulls and skins additionally displayed antibacterial activity against multidrug resistant bacterial pathogens, showing interesting potential to be further investigated as antibacterial agents, this being a step forward towards to new added-value alternatives for these agro-industrial residues. When studying the response of almond yield and quality attributes, the highest variability was noticed for the seasonal differences; almond yield decreased for around 70% in average, while water stress influenced all the quality features. Even if some quality attributes increased at rainfed trees, the differences in yield in the second year of the study revealed the main problem of rainfed almond orchards in semiarid areas: irregular yield when under not irrigated conditions. The kaolin application, on the other side, did not manage to reduce drought in almond trees throughout the study exhibiting similar behaviour as non-irrigated trees, however, not showing to be prejudicial. When addressing the aim of method development for quality monitoring to be used in almond food industry, the suitability of the near infrared (NIR) and mid infrared (MIR) regions was assessed to produce quantitative models for the prediction of crude protein and amino acid content in almond kernels. The best prediction models were obtained with NIR, and FTIR was shown to be successfully used for almond protein and amino acid determination. Finally, regarding the physiological and biochemical response to treatments, all the determined parameters were influenced by the total water reduction, however, trees not displaying the severe stress, except for the considered gas exchange parameters. Stomatal closure was noticed as probably being the main limitation of photosynthesis in almond tree. Observed differences showed the importance of the irrigation role in almond production compared to complete absence of irrigation. Within irrigation treatments, deficit irrigation did not lower the overall yield and quality when compared to the fully irrigated trees, while also not having negative impact on the overall tree performance.
Freyenberger, Stanley G. "Emergence, yield, and yield-components responses to size and density separations of pearl millet seed produced by three management practices". 1986. http://hdl.handle.net/2097/22107.
Texto completoSchuster, Matthew D. "Annual bluegrass (Poa annua L.) emergence under different residue management practices in perennial ryegrass and determination of resistant and susceptible annual bluegrass germination under controlled temperature and moisture". Thesis, 1999. http://hdl.handle.net/1957/29112.
Texto completoGraduation date: 2000
(10752345), Pragya Kandel. "ASSESSMENT OF POSTHARVEST PEST MANAGEMENT PRACTICES IN NEPAL AND EFFICACY OF HYPOXIA FOR CONTROLLING SITOPHILUS ORYZAE L. (COLEOPTERA: CURCULIONIDAE)". Thesis, 2021.
Buscar texto completoChale-Matsau, Jacobeth Raesibe Bettina. "Persistence of Human Pathogens in a Crop Grown from Sewage Sludge Treated Soil". Thesis, 2005. http://hdl.handle.net/2263/28268.
Texto completoThesis (PhD (Water Utilisation))--University of Pretoria, 2006.
Chemical Engineering
unrestricted
(9847298), Zongjian Yang. "Resource allocation within plants: Some theoretical and practical implications for control of plant development". Thesis, 2003. https://figshare.com/articles/thesis/Resource_allocation_within_plants_Some_theoretical_and_practical_implications_for_control_of_plant_development/13424417.
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