Development And Utilization Of Irrigation Simulation With Ceres Maize In A Central Iowa Cornfield
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Development And Utilization Of Irrigation Simulation With Ceres Maize In A Central Iowa Cornfield
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Author : Kendall Craig DeJonge
language : en
Publisher:
Release Date : 2006
Development And Utilization Of Irrigation Simulation With Ceres Maize In A Central Iowa Cornfield written by Kendall Craig DeJonge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Crop models have emerged as a method to evaluate different crop management practices such as irrigation without costly and time-consuming onsite experiments. A decision support system called APOLLO has been developed in past years to assist researchers in using the CERES-Maize crop model to simulate precision farming methods for corn. Past experiments have used APOLLO to develop precision population and nitrogen application prescriptions for maximum yield. In this work, an additional module was created for APOLLO to automate spatially variable irrigation scenarios. This module has the capability of simulating blanket scheduled uniform irrigations or precision irrigations based on percent of available soil water. In a Windows-based interface, the user can input desired irrigation application efficiency, irrigation amount, and threshold and management depth used for automatic applications. The module was successfully tested using several years of data and various schedules, application thresholds, irrigation amounts, and management depths. This simulation may be a very powerful tool in studying irrigation feasibility, deficit irrigation, and varying irrigation management strategies. Few studies have been done considering the possibility of irrigation systems in Iowa or other humid regions. Recent technological progress in precision agriculture may allow irrigation in these areas to become more economically feasible. In this study, the newly developed irrigation module in the APOLLO program was used to evaluate potential improved yield in a central Iowa cornfield on a spatially and temporally variable basis. Five years of historical yield and weather data were used to calibrate the model for the 20.25 ha field over 100 spatially variable grids. This calibrated model then used 28 years of historical weather data to simulate three irrigation scenarios: no irrigation, scheduled uniform irrigation, and precision irrigation. 30 mm irrigations were applied when the percent of available soil water fell below 50 percent. Irrigation improved yield by at least 1000 kg ha−1 in half of the years simulated, and also showed to have less variability both spatially and temporally. Precision irrigation showed slightly higher yields than scheduled uniform irrigation. Spatial variability of yield was most influence by topography, with the largest improvements occurring on steep sideslopes and hilltops. Assuming use of a center pivot irrigation system, irrigation showed economic returns in only three of the 28 years included in the study. High capital costs were the leading restrictor of economic feasibility.
Ceres Maize
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Author : C. Allan Jones
language : en
Publisher:
Release Date : 1986
Ceres Maize written by C. Allan Jones and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with CERES-Maize (Computer file) categories.
This programme provides the documentation, testing and software of CERES-maize, a quite comprehensive model of maize growth and development.
Master S Theses Directories
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Author :
language : en
Publisher:
Release Date : 2006
Master S Theses Directories written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Dissertations, Academic categories.
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Root Zone Water Quality Model
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Author : Lajpat Ahuja
language : en
Publisher: Water Resources Publication
Release Date : 2000
Root Zone Water Quality Model written by Lajpat Ahuja and has been published by Water Resources Publication this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Technology & Engineering categories.
This publication comes with computer software and presents a comprehensive simulation model designed to predict the hydrologic response, including potential for surface and groundwater contamination, of alternative crop-management systems. It simulates crop development and the movement of water, nutrients and pesticides over and through the root zone for a representative unit area of an agricultural field over multiple years. The model allows simulation of a wide spectrum of management practices and scenarios with special features such as the rapid transport of surface-applied chemicals through macropores to deeper depths and the preferential transport of chemicals within the soil matrix via mobile-immobile zones. The transfer of surface-applied chemicals (pesticides in particular) to runoff water is also an important component.
Modeling Physiology Of Crop Development Growth And Yield
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Author : Afshin Soltani
language : en
Publisher: CABI
Release Date : 2012
Modeling Physiology Of Crop Development Growth And Yield written by Afshin Soltani and has been published by CABI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.
Model studies focus experimental investigations to improve our understanding and performance of systems. Concentrating on crop modelling, this book provides an introduction to the concepts of crop development, growth, and yield, with step-by-step outlines to each topic, suggested exercises and simple equations. A valuable text for students and researchers of crop development alike, this book is written in five parts that allow the reader to develop a solid foundation and coverage of production models including water- and nitrogen-limited systems.
Maize Production Environments Revisited
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Author : A. D. Hartkamp
language : en
Publisher: CIMMYT
Release Date : 2001
Maize Production Environments Revisited written by A. D. Hartkamp and has been published by CIMMYT this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Corn categories.
This publication presents a GIS-based approach for revising the definitions of global maize production environments, called “mega-environments” (MEs), used by CIMMYT and its partners. A cluster analysis was performed on climate data, representing a four-month growing season, for key maize producing locations. Assuming rainfed production, the onset of the growing season was determined based on the month when the ratio of precipitation over potential evapotranspiration exceeds 0.5. Diagnostic criteria for mapping MEs were based on cluster analysis results and expert knowledge. The resulting maps can be used to select appropriate target environments for maize germplasm and trials, as well as in priority setting and site selection for global maize breeding programs.
Maize Crop
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Author : A. Solaimalai
language : en
Publisher: CRC Press
Release Date : 2020-05-10
Maize Crop written by A. Solaimalai and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-10 with Technology & Engineering categories.
Maize is one of the versatile emerging crops with wider adaptability under varied agro-climatic conditions. Globally, maize is known as queen of cereals because it has the highest genetic yield potential among the cereals. It is cultivated on nearly 150 m/ha in about 160 countries having wider diversity of soil, climate, biodiversity and management practices that contributes 36 % (782 m/t) in the global grain production. The United States of America (USA) is the largest producer of maize contributes nearly 35 % of the total production in the world. It is the driver of the US economy. This book talks about the improvement, production, protection and post harvest technology of the maize crop. Note: T& F does not sell or distribute the Hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka.
Methods Of Introducing System Models Into Agricultural Research
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Author : Lajpat R. Ahuja
language : en
Publisher: John Wiley & Sons
Release Date : 2020-01-22
Methods Of Introducing System Models Into Agricultural Research written by Lajpat R. Ahuja and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-22 with Technology & Engineering categories.
Why model? Agricultural system models enhance and extend field research...to synthesize and examine experiment data and advance our knowledge faster, to extend current research in time to predict best management systems, and to prepare for climate-change effects on agriculture. The relevance of such models depends on their implementation. Methods of Introducing System Models into Agricultural Research is the ultimate handbook for field scientists and other model users in the proper methods of model use. Readers will learn parameter estimation, calibration, validation, and extension of experimental results to other weather conditions, soils, and climates. The proper methods are the key to realizing the great potential benefits of modeling an agricultural system. Experts cover the major models, with the synthesis of knowledge that is the hallmark of the Advances in Agricultural Systems Modeling series.
Deficit Irrigation Practices
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Author : Food and Agriculture Organization of the United Nations
language : en
Publisher: Food & Agriculture Org.
Release Date : 2002
Deficit Irrigation Practices written by Food and Agriculture Organization of the United Nations and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
In the context of improving water productivity, there is a growing interest in deficit irrigation, an irrigation practice whereby water supply is reduced below maximum levels and mild stress is allowed with minimal effects on yield. Under conditions of scarce water supply and drought, deficit irrigation can lead to greater economic gains than maximizing yields per unit of water for a given crop; farmers are more inclined to use water more efficiently, and more water-efficient cash crop selection helps optimize returns. However, this approach requires precise knowledge of crop response to water as drought tolerance varies considerably by species, cultivar and stage of growth. The studies present the latest research concepts and involve various practices for deficit irrigation. Both annual and perennial crops were exposed to different levels of water stress, either during a particular growth phase, throughout the whole growing season or in a combination of growth stages. The overall finding, based on the synthesis of the different contributions, is that deficit or regulated-deficit irrigation can be beneficial where appropriately applied. Substantial savings of water can be achieved with little impact on the quality and quantity of the harvested yield. However, to be successful, an intimate knowledge of crop behavior is required, as crop response to water stress varies considerably.
Market Issues And Prospects For U S Distillers Grains Supply Use And Price Relationships
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Author : Linwood A. Hoffman
language : en
Publisher: DIANE Publishing
Release Date : 2011-04
Market Issues And Prospects For U S Distillers Grains Supply Use And Price Relationships written by Linwood A. Hoffman and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-04 with Reference categories.
Growth in corn dry-mill ethanol production has surged in the past several years, simultaneously creating a co-product distillers' grains (DDGS). Many in the U.S. feed industry were concerned about the size of this new feed source and whether it could be used entirely by the feed industry, but they also worried about the price discovery process for the product. Provides a transparent methodology to estimate U.S. supply and consumption of DDGS. Potential domestic and export use of U.S. DDGS exceeds current production and is likely to exceed future production as ethanol production continues to grow. Identifies the DDGS price discovery process along with the price relationships of distillers' grains, corn, and soybean meal. Illus. A print on demand report.