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Dissertations / Theses on the topic 'Crop modeling'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Perkins, Seth A. "Crop model review and sweet sorghum crop model parameter development." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/14037.

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Master of Science<br>Department of Biological and Agricultural Engineering<br>Kyle Douglas-Mankin<br>Opportunities for alternative biofuel feedstocks are widespread for a number of reasons: increased environmental and economic concerns over corn production and processing, limitations in the use of corn-based ethanol to 57 billion L (15 billion gal) by the Energy Independence and Security Act (US Congress, 2007), and target requirements of 136 billion L (36 billion gal) of renewable fuel production by 2022. The objective of this study was to select the most promising among currently available

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2

Bracho, Belkys Yasmin. "Application of statistical techniques to modeling crop growth." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010109.

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3

Chowdhury, Nazea H. Khan. "Crop Acreage Response Modeling in North Dakota and Greater Midwest." Diss., North Dakota State University, 2017. https://hdl.handle.net/10365/26711.

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Our research consists of two papers. First paper focus on the trend of North Dakota (ND) crop acreage changes and include economic factors (expected prices of crops, input price, crop yield, revenue of crops) and climate factors (precipitation, minimum and maximum temperature, growing degree days, and palmer drought severity index). We are using Geographic Information System (GIS) database for cropland areas throughout ND for the years 1998 through 2013. But we are using five crops for our analysis. We use Seemingly Unrelated Tobit Left Censored Regression and Monte Carlo Simulation techniques

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4

Gornott, Christoph. "Improving crop modeling approaches for supporting farmers to cope with weather risks." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19266.

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Sich ändernde Klima- und Wetterbedingungen in Verbindung mit einer begrenzt ausdehnbaren Ackerfläche werden den Druck auf Nahrungsmittelproduktionssysteme weiter erhöhen. Um dieser Herausforderung gerecht zu werden, ist eine Erhöhung und Stabilisierung der Ernteerträge unverzichtbar. Dies erfordert aber ein tieferes Verständnis der Einflussfaktoren, die auf die Ertragsvariabilität wirken. Diese Dissertation leistet einen Forschungsbeitrag zu Ertragsmodellen in Deutschland, Tansania und auf globaler Ebene. Dazu analysiere und kombiniere ich statistische und prozessbasierte Ertragsmodelle in fün

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5

Martin, Benjamin A. "TWO ESSAYS ON WHOLE FARM MODELING AND CROP MARKETING IN WESTERN KENTUCKY." UKnowledge, 2018. https://uknowledge.uky.edu/agecon_etds/65.

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This thesis is composed of two essays that investigate whole farm planning and crop marketing in western Kentucky. In the first essay, contracting decisions between food corn producers and a mill are analyzed to observe factors affecting the bushel amount farmers contract. Unbalanced panel data containing seven years’ worth of pricing and contract information are used with a fixed-effects model to generate parameter estimates and quantify their effect on bushels contracted. It was found that contract attributes, market condition, and relationship-specific assets had a significant effect on pro

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6

Napier, Christopher Cameron. "Crop Yield using Novel Parametric L-system plant modelling." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2024. https://ro.ecu.edu.au/theses/2907.

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This research considers a system for the recognition of real plant parts through image analysis based upon synthetic plant modelling. It aims to use data pipelines and synthetic datasets to define recognizable features that assist in the efficient analysis of real plants and plant images. This research asks about the efficacy of L-systems in accurately simulating wheat crop characteristics. It specifically focusses on readable, understandable, accurate, and complex L-system algorithms. The research examines wheat crops in terms of phenotypes and examines the accuracy of a dataset in support of

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7

CAMPOS, TARANGO ISIDRO AUDBERTO. "SPATIAL MODELING OF RED SPIDER MITE Oligonychus punica (ACARI: TETRANYCIDAE) IN AVOCADO CROP." Tesis de Licenciatura, UNIVERSIDAD AUTONOMA DEL ESTADO DE MÉXICO, 2021. http://hdl.handle.net/20.500.11799/111285.

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Este artículo fue utilizado para la titulación de Licenciatura. Se Estudio y estableció la distribución espacial del ácaro araña roja en el cultivo de aguacate. Se logró establecer que la distribución es agregada y que la superficie infestada por la plaga no alcanza el 100%. Se lograron realizar mapas de densidad y distribución del ácaro los cuales servirán para dirigir las medidas de control sobre áreas específicas de infestación, con los consecuentes ahorros económicos y el menor impacto ambiente de la región. Con los resultados obtenidos es posible elaborar un Programa de Manejo Integrado

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8

Abreu, Daniel Carneiro de. "Whole-farm modeling approach to evaluate different crop rotations in organic dairy systems." Universidade Federal de Viçosa, 2014. http://www.locus.ufv.br/handle/123456789/6596.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2015-11-09T15:34:52Z No. of bitstreams: 1 texto completo.pdf: 492609 bytes, checksum: 66747ed601f7421b79e4e7f037a223b9 (MD5)<br>Made available in DSpace on 2015-11-09T15:34:52Z (GMT). No. of bitstreams: 1 texto completo.pdf: 492609 bytes, checksum: 66747ed601f7421b79e4e7f037a223b9 (MD5) Previous issue date: 2014-09-25<br>Fundação de Amparo à Pesquisa do Estado de Minas Gerais<br>O mercado de trigo (Triticum aestivum L.) orgânico para produção de pão cresceu em grande magnitude na região da Nova Inglaterra, nos Estados Unidos.

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9

Wagner, Nicole Catherine. "Wheat yield prediction modeling for localized optimization of fertilizer and herbicide application." Diss., Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/wagner/WagnerN0805.pdf.

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10

Caiado, Marco Aurelio. "Modeling Fate and Transport of Nitrogen and Phosphorus in Crop Fields Under Tropical Conditions." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/28848.

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Modeling is a very important tool for developing nonpoint source (NPS) pollution control plans. Current NPS models were developed for temperate conditions and, thus, do not appropriately represent tropical conditions. The objective of this research was to develop or adapt a nonpoint source pollution model to simulate transformations and losses of nitrogen (N) and phosphorus (P) in leachate and runoff from crop fields under humid tropical conditions. An extensive literature synthesis identified appropriate relationships for representing hydrologic and NPS processes in the tropics, as well as

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11

Kawakita, Satoshi. "Modeling and Predicting Wheat Phenological Development Using Meteorological Information." Kyoto University, 2020. http://hdl.handle.net/2433/259070.

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12

Karimi-Zindashty, Yousef. "Application of hyperspectral remote sensing in stress detection and crop growth modeling in corn fields." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85560.

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This study used hyperspectral data to determine nitrogen, weed, and water stresses in a corn (Zea mays L.) field in southwestern Quebec, and incorporated these data in crop growth models for better crop growth simulation under stressful conditions.<br>In 2000, aerial hyperspectral images (72 wavebands, ranging from 407 to 949 nm) were acquired, and analyzed using a stepwise approach to identify wavebands useful in detecting weed and nitrogen stresses. Discriminant analysis (DA) was used to classify different weed and nitrogen treatments and their combinations. This analysis showed great

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13

Zbylut, Joanna. "Modeling proportions to assess the soil nematode community structure in a two year alfalfa crop." Kansas State University, 2014. http://hdl.handle.net/2097/17327.

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Master of Science<br>Department of Statistics<br>Leigh Murray<br>The southern root-knot nematode (SRKN) and the weedy perennials, yellow nutsedge (YNS) and purple nutsedge (PNS) are simultaneously occurring pests in the irrigated agricultural soils of southern New Mexico. Previous research has very well characterized SRKN, YNS and PNS as a mutually-beneficial pest complex and has revealed their enhanced population growth and survival when they occur together. The density of nutsedge in a field could be used as a predictor of SRKN juveniles in the soil. In addition to SRKN, which is the most ha

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14

Barros, Inácio de. "Soil related limitation to crop production in the semiarid Northeast of Brazil : identification and modeling /." Stuttgart : Inst. für Bodenkunde und Standortslehre, 2002. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010218120&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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15

Castelhano, Michael Joseph. "Staple Crop Diversity and Risk Mitigation - Potatoes in Bolivia." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35254.

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Rural areas of most developing nations are dependent on agriculture. In the most remote areas, sometimes referred to as the â less favored areasâ (LFAs), the economic importance of agriculture is paramount. An important obstacle to development in these areas is that agriculture is at the mercy of nature, which may not be particularly friendly. These areas have remained remote due to natural shortcomings causing economic development to occur slower than more advantaged areas elsewhere. Cochabamba Department, in central Bolivia, is home to some of these LFAs. Most Cochabamban producers are l

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16

Junior, Pedro Abel Vieira. "Previsão de atributos do clima e do rendimento de grãos de milho na região Centro-Sul do Brasil." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-06032007-144956/.

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A Previsão de Safras tem se constituído em importante ferramenta para o estabelecimento de políticas agrícolas públicas e privadas. Em geral, a Previsão de Safras consiste na previsão do clima e na estimativa do rendimento das partes de interesse econômico de uma cultura. A previsão do clima pode ser realizada pela análise de séries históricas dos parâmetros climáticos e dos efeitos de fenômenos conhecidos, a exemplo do El Niño Oscilação Sul (ENSO), o qual pode ser medido pelo Índice de Oscilação Sul (IOS). Também pode ser realizada pela integração numérica das equações diferenciais que regem

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17

Scheppler, Hannah B. "Modeling the Climatic Niche of Wild Carica Papaya." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami157490469591439.

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18

Yanosek, Kristina Anne. "Enhanced Biological Phosphorus Removal from Dairy Manure to Meet Nitrogen:Phosphorus Crop Nutrient Requirements." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35782.

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Over the last two decades, livestock operations have become highly concentrated due to growing trends towards larger, more confined facilities and a decrease in cropland on smaller farms. This has led to greater amounts of excess manure nutrients on farms, increasing the potential for nutrient pollution of water bodies from runoff. The purpose of this study was to determine if enhanced biological phosphorus removal (EBPR) is a viable alternative for managing excess manure nutrients on dairy farms. Assessment of EBPR involved the investigation of various aspects of wastewater treatment model

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19

Mollenkamp, Lorinda Larae. "Demonstrating an approach for modeling crop growth and hydrology using SWAT 2009 in Kanopolis Lake Watershed, Kansas." Kansas State University, 2013. http://hdl.handle.net/2097/16307.

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Master of Science<br>Department of Biological and Agricultural Engineering<br>Kyle R. Douglas-Mankin<br>Aleksey Y. Sheshukov<br>According the U.S. Environmental Protection Agency’s (EPA) website, our planet is at risk of global warming due to greenhouse gas emissions. The earth’s average temperature has been reported to have risen by 1.4°F over the last century. This seemingly small increase in average planetary temperature has been linked to devastating floods, severe heat waves, and dangerous and unpredictable shifts in our climate (US EPA, 2013a). In the 2012 report, the Intergovernmental P

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20

Graham, Michael William. "Evaluating the interactions of crop management, carbon cycling, and climate using Earth system modeling and remote sensing." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/102386.

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Crop management practices, such as soil tillage and crop residue management, are land management activities with potentially large impacts on carbon (C) cycling and climate at the global scale. Improvements in crop management practices, such as conservation tillage or 'no-till' (NT), have been proposed as climate change mitigation measures because such practices may alter C cycles through increased sequestration of soil C in agricultural soils. Despite their potential importance, regional to global scale data are lacking for many crop management practices, and few studies have evaluated the po

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21

Svedin, Jeffrey David. "Characterizing the Spatial Variation of Crop Water Productivity for Variable-Rate Irrigation Management." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6878.

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Irrigated agriculture is the primary consumer of limited worldwide freshwater resources. Drought, growing world populations, and environmental demands compete with irrigation for freshwater resources"”threatening sustainable global food, fuel, and fiber production. This escalating global crisis demands that agriculture produce more food using less water. Traditional irrigation management has used technology to apply uniform irrigation rates across landscapes"”ignoring natural environmental variation. This provides inherent inefficiencies of over- or under- irrigation within individual fields.

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22

Prenger, Jessica J. "Development of a Plant Response Feedback Irrigation Control System Based on Crop Water Stress Index and Evapotranspiration Modeling." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1419601844.

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23

Gitonga, Jeremiah Njeru Lewis. "Monitoring and modeling crop growth, water use and production under dry-land environment North-West of Mount Kenya /." [S.l.] : [s.n.], 2005. http://www.zb.unibe.ch/download/eldiss/05njeru_j.pdf.

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24

Allison, John T. Jr. "TWO ESSAYS ON INPUT SUBSTITUTION AND OPTIMAL DECISION MAKING IN CROP AND LIVESTOCK PRODUCTION SYSTEMS." UKnowledge, 2019. https://uknowledge.uky.edu/agecon_etds/80.

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The thesis presented consists of two essays that analyze input substitution and decision making in crop and livestock production systems. The first essay consists of a whole-farm analysis that sought to optimize feed mixes and enterprise combinations for an organic dairy operation in the Southeastern United States. This was accomplished through mathematical programming where whole-farm net returns were maximized, and total feed costs were minimized simultaneously for four milk production level cases. Additionally, the sensitivity of the system and break-even milk price were explored. Results s

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25

Garcia, Adriano Gomes. "Computational modeling to describe the dynamics of fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in Bt crop areas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-20032018-135036/.

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Spodoptera frugiperda is one of the main insect pests of the New World, and causes extensive damage to economically important crops such as cotton and corn. One of the most common control strategies is the use of Bt plants; however, their intense and indiscriminate use has led to the evolution of resistance in some populations. The establishment of a refuge can be a viable option to delay this process. Refuges consist of areas where non-Bt crops are planted, in order to provide susceptible insects to the population. In this study, I initially developed a model to describe the evolution of resi

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26

Rosa, Carlos Alberto Pinto da. "Caracterização da variação temporal da massa de matéria seca de plantas de milho." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-22062009-152012/.

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Com o objetivo de caracterizar a variação temporal da massa de matéria seca de plantas de milho, foram conduzidos experimentos de campo na área experimental do Departamento de Produção Vegetal da Universidade de São Paulo em Piracicaba, SP (latitude: 22o42\'30\'\' Sul, longitude: 47o38\'00\'\' Oeste, e altitude: 546 metros), na safra 2003/2004 (semeadura: 20 de setembro de 2003). Foram utilizados três genótipos de milho, BRS-1001, BRS-1010 e BRS-3003, sob condições de sequeiro e irrigado, com duas repetições em delineamento inteiramente casualizado. Em função dos resultados obtidos, pode-se co

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27

Goodman, Jenette Michelle. "Creating a Reliable and Transparent System for Updating Soil Based Yield and Productivity Data." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284689028.

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28

Bocher, Temesgen Fitamo [Verfasser], and Thomas [Akademischer Betreuer] Berger. "Modeling crop yield and farmer adaptation to rainfall variability : the case of Southern Ethiopia / Temesgen Fitamo Bocher. Betreuer: Thomas Berger." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2016. http://d-nb.info/110005541X/34.

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29

Röll, Georg [Verfasser], and Simone [Akademischer Betreuer] Graeff-Hönninger. "Combining remote sensing and crop modeling techniques to derive a nitrogen fertilizer application strategy / Georg Röll ; Betreuer: Simone Graeff-Hönninger." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2020. http://d-nb.info/1223537870/34.

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30

Narasimhan, Balaji. "Development of indices for agricultural drought monitoring using a spatially distributed hydrologic model." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/2727.

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Farming communities in the United States and around the world lose billions of dollars every year due to drought. Drought Indices such as the Palmer Drought Severity Index (PDSI) and Standardized Precipitation Index (SPI) are widely used by the government agencies to assess and respond to drought. These drought indices are currently monitored at a large spatial resolution (several thousand km2). Further, these drought indices are primarily based on precipitation deficits and are thus good indicators for monitoring large scale meteorological drought. However, agricultural drought depends on s

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31

Gornott, Christoph [Verfasser], Hermann [Gutachter] Lotze-Campen, and Reimund Paul [Gutachter] Rötter. "Improving crop modeling approaches for supporting farmers to cope with weather risks / Christoph Gornott ; Gutachter: Hermann Lotze-Campen, Reimund Paul Rötter." Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1184576491/34.

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32

Salmon, Jessica Meghan. "Using satellite remote sensing and hydrologic modeling to improve understanding of crop management and agricultural water use at regional to global scales." Thesis, Boston University, 2013. https://hdl.handle.net/2144/11040.

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Thesis (Ph. D.)--Boston University<br>Croplands are essential to human welfare. In the coming decades , croplands will experience substantial stress from climate change, population growth, changing diets, urban expansion, and increased demand for biofuels. Food security in many parts of the world therefore requires informed crop management and adaptation strategies. In this dissertation, I explore two key dimensions of crop management with significant potential to improve adaptation pathways: irrigation and crop calendars. Irrigation, which is widely used to boost crop yields, is a key strateg

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33

Anjos, Franklin Alves dos. "Simulação de produtividade de milho em diferentes épocas de semeio em Arapiraca, Alagoas, pelo modelo AquaCrop." Universidade Federal de Alagoas, 2011. http://repositorio.ufal.br/handle/riufal/235.

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The maize (Zea mays L.), due to its importance in human and animal diet, is one of the most widespread crop in the world. In Brazil, it is cultivated in almost all regions, due to this, has been the focus of agrometeorological modeling for decades. The AquaCrop model was used in this work in order to simulate the total biomass and daily yield, and get the corn crop forecast for the region of Arapiraca, Alagoas. The model uses the canopy cover (CC), instead of leaf area index (LAI) as a basis for separate calculations of the plant transpiration and evaporation of soil water. The productivity is

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34

Waha, Katharina. "Climate change impacts on agricultural vegetation in sub-Saharan Africa." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2013/6471/.

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Agriculture is one of the most important human activities providing food and more agricultural goods for seven billion people around the world and is of special importance in sub-Saharan Africa. The majority of people depends on the agricultural sector for their livelihoods and will suffer from negative climate change impacts on agriculture until the middle and end of the 21st century, even more if weak governments, economic crises or violent conflicts endanger the countries’ food security. The impact of temperature increases and changing precipitation patterns on agricultural vegetation motiv

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35

Masikati, Patricia [Verfasser]. "Improving the water productivity of integrated crop-livestock systems in the semi-arid tropics of Zimbabwe : an ex-ante analysis using simulation modeling / Patricia Masikati." Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1016183801/34.

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36

Gaiewski, Vicente. "Parametrização do modelo LINTUL para estimar a produtividade potencial da cultura de milho." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-10112009-152845/.

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Com o objetivo de parametrizar o modelo LINTUL (Light Interception and Utilization - Interceptação e Utilização da Luz) foi conduzido um experimento de campo, na safra 2003/2004, em Piracicaba-SP, na área experimental do Departamento de Produção Vegetal (Esalq) da Universidade de São Paulo, utilizando o procedimento de análise de crescimento. Ao longo do ciclo da cultura, foram efetuadas 24 amostragens, com 4 repetições, para determinação da massa de matéria seca de raiz, colmo, folha e órgão reprodutivo. Em função dos resultados obtidos referentes à parametrização do modelo LINTUL com base na

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37

Duan, Xiaohong [Verfasser], Jean Charles [Akademischer Betreuer] Munch, and Eckart [Akademischer Betreuer] Priesack. "Modeling the impact of soil heterogeneity on the variability of crop growth at field scale / Xiaohong Duan. Gutachter: Jean Charles Munch ; Eckart Priesack. Betreuer: Jean Charles Munch." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1015804721/34.

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38

Schreinemachers, Pepijn. "The (ir)relevance of the crop yield gap concept to food security in developing countries : with an application of multi agent modeling to farming systems in Uganda /." Göttingen : Cuvillier, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015865906&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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39

Watt, J. "3D crop modelling." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1421425/.

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Crop models have become increasingly useful tools for understanding and implementing sus¬tainable agricultural techniques and as a way of accurately predicting crop yields for economists and policy decision makers. Using remotely sensed imagery can significantly reduce the effort required to obtain the in¬puts for crop models and can provide regular sets of observations throughout a growing season. Empirical models can be used to extract information regarding the crop from remotely sensed images but have well-documented limitations. Coupling a crop model with a radiative transfer model allows

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40

Alexander, Peter Mark William. "Modelling the UK perennial energy crop market." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9645.

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Biomass produced from perennial energy crops, Miscanthus and willow or poplar grown as short-rotation coppice, is expected to contribute to UK renewable energy targets and reduce the carbon intensity of energy production. The UK Government has had incentives in place, targeting farmers and power plant investors to develop this market, but growth has been slower than anticipated. Market expansion requires farmers to select to grow these crops, and the construction of facilities, such as biomass power plants, to consume them. Farmer behaviour and preferences, including risk-aversion, are believe

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41

Castellazzi, M. S. "Spatio-temporal modelling of crop co-existence in European agricultural landscapes." Thesis, Cranfield University, 2007. http://dspace.lib.cranfield.ac.uk/handle/1826/3747.

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The environmental risk of growing genetically modified (GM) crops and particularly the spreading of GM genes to related non-GM crops is currently a concern in European agriculture. Because the risks of contamination are linked to the spatial and temporal arrangements of crops within the landscape, scenarios of crop arrangement are required to investigate the risks and potential coexistence measures. However, until recently, only manual methods were available to create scenarios. This thesis aims to provide a flexible referenced tool to create such scenarios. The model, called LandSFACTS, is a

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42

Allinne, Clémentine. "Modélisation écophysiologique et analyse génétique pour la recherche de génotypes de tournesol adaptés aux basses températures causées par des semis précoces." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT012A/document.

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Le semis précoce du tournesol, d’un à deux mois par rapport à la période habituelle (Avril dans le sud ouest de la France), a été envisagé pour esquiver les périodes de sécheresses estivales. Cette stratégie conduit à un abaissement des températures de l’ordre de 5 à 10°C durant les premières phases de développement de la culture. L’objectif de ce travail est donc d’identifier des génotypes de tournesol adaptés à des conditions de basses températures en début de cycle, et de fournir des outils pour la sélection de ces nouveaux idéotypes. Dans un premier temps le modèle de culture SUNFLO, dével

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Góes, Bruno César. "Modelagem fuzzy do acúmulo de matéria seca e das variáveis nutricionais de coberturas vegetais de preparo para sistema plantio direto em resposta à diferentes doses de nitrogênio /." Tupã, 2019. http://hdl.handle.net/11449/180793.

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Orientador: Luís Roberto Almeida Gabriel Filho<br>Coorientador: Renato Jaqueto Goes<br>Coorientadora: Camila Pires Cremasco Gabriel<br>Resumo: O Sistema Plantio Direto (SPD) tem como característica a ocupação permanente do terreno agrícola com culturas vegetais além da manutenção da palhada sob a superfície do solo. Entretanto, para eficácia do SPD, é necessário adotar culturas de coberturas adequadas com a região a ser implementado, levando-se em consideração fatores edafoclimáticos e tipos de solo, para que dessa forma, haja a formação e manutenção da palhada sobre a superfície do solo. O so

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Soutif-Bellenger, Myriam. "Eau, agriculture, changement climatique : apports d'une modélisation intégrée agro-hydrologique pour l'adaptation." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS469.

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L’agriculture consomme de l’eau pour répondre aux besoins biologiques des cultures. Quand l’eau apportée au sol par les précipitations n’est pas suffisante, de l’eau supplémentaire peut être prélevée dans les masses d’eau et apportée aux cultures : c’est ce qu’on appelle l’irrigation. Avec l’intensification du risque de sécheresse, les territoires agricoles sont particulièrement impactés par le changement climatique. Il est donc nécessaire de construire et évaluer des stratégies d’adaptation. Pour cela, nous devons prendre en compte l’évolution de la demande en eau d’irrigation dans les projec

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Talbot, Grégoire. "L'intégration spatiale et temporelle du partage des ressources dans un système agroforestiers noyers-céréales, une clef pour en comprendre la productivité ?" Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20219/document.

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Des mesures sur parcelles agroforestières (mélanges d'arbres et de cultures) expérimentales mettent en évidence des productivités exceptionnelles, avec des gains de plus de 30% par rapport à l'assolement de cultures pures. Nous avons mis au point et utilisé un modèle numérique dynamique en 3-D (Hi-sAFe) pour (1) tester si l'intégration spatio-temporelle du partage des ressources (lumière, eau, azote) entre espèces suffit à expliquer cette productivité et (2) évaluer l'impact de différents choix de conception ou de gestion sur cette productivité, à partir d'une compréhension des processus impli

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Walter, Lidiane Cristine. "SIMULAÇÃO DA PRODUTIVIDADE DE GRÃOS DE ARROZ IRRIGADO EM CENÁRIO FUTURO NO ESTADO DO RIO GRANDE DO SUL." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/3614.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Projections of a possible climate change indicate that the current CO2 concentration is expected to double and air temperature increase by up to 6°C by the end of this century, leading to changes in crops yield. The impact of climate change on irrigated rice in conditions of Southern Brazil should be positive, with increases in potential grain yield. However, there are few studies to assess the impact of climate change in Rio Grande do Sul, a State with an important role in rice production in the country. Thus, the objective of t

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Kyulavski, Vladislav Dimitrov. "Greenhouse gas emissions and soil carbon stocks associated with crop residues and organic fertilizers mixtures in sugar cane cropping systems." Thesis, La Réunion, 2019. https://elgebar.univ-reunion.fr/login?url=http://thesesenligne.univ.run/19_27_VDKyulav.pdf.

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Dans le contexte environnemental actuel il est nécessaire d’optimiser l’utilisation des ressources pour réduire les déchets et les émissions de gaz à effet de serre (GES). L’utilisation de ressources renouvelables et le recyclage sont au cœur du modèle d’économie circulaire, selon lequel le déchet est une ressource mobilisable, transformable, réutilisable et par conséquent non limitée. En agriculture, le cercle vertueux de l’économie circulaire peut être mis en place à travers le recyclage des matières organiques en tant que fertilisants et l’adoption d’une approche agroécologique qui privilég

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Louis, Benjamin. "Prise en compte du rôle de la diversité microbienne dans la simulation de la dynamique de la matière organique du sol (MOS) dans un contexte de transition vers l'agro-écologie." Thesis, Rennes, Agrocampus Ouest, 2016. http://www.theses.fr/2016NSARC126/document.

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La thèse propose et évalue une méthode de prise en compte de la diversité microbienne dans un modèle mécaniste opérationnel de dynamique du carbone (C). Partant d'un modèle classique dont les flux de minéralisation sont décrits par des cinétiques d'ordre 1, nous proposons des fonctions de modulation des paramètres des équations prenant en compte des indices de diversité microbienne. Elle s’appuie sur 2 jeux de données contenant des mesures de diversité microbienne et des cinétiques de minéralisation du C sur 80 jours, en conditions contrôlées, avec et sans apport de blé marqué au 13C, issus d'

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Rosa, Hamilton Telles. "Simulação do crescimento, desenvolvimento e produtividade de arroz no Rio Grande do Sul com o modelo simularroz." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/3223.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The SimulArroz is an ecophysiological dynamic processes-based model for simulating the growth, development and grain yield of rice. In order to have scientific credibility, a simulation model has to be tested and exposed to different cropping conditions. Although this model is in use, constant studies and improvements have to be pursued so that new versions are released and able to accurately describe the complex interactions of factors that influence the growth, development and grain yield of rice. The objectives of this thesis we

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Al-Azri, Masoud. "Modelling crop diseases for food security." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/44777/.

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Global crop production is affected by seasonal and climatic variations in temperature, rainfall patterns or intensity and the occurrence of abiotic and biotic stresses. Climate change can alter pest and pathogen populations as well as pathogen complexes that pose an enormous risk to crop yields and future food security. Crop simulation models have been validated as an important tool for the development of more resilient agricultural systems and improved decision making for growers. The Agricultural Production Systems Simulator (APSIM) is a software tool that enables sub-models to be incorporat

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