Modeling The Field Water Balance On Irrigated Crop Fields Using Root Zone Water Quality Model
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Modeling The Field Water Balance On Irrigated Crop Fields Using Root Zone Water Quality Model
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Author : Michael I. Gangwer
language : en
Publisher:
Release Date : 2005
Modeling The Field Water Balance On Irrigated Crop Fields Using Root Zone Water Quality Model written by Michael I. Gangwer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Soil management categories.
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.
Crop Growth And Soil Water Balance Modeling To Explore Water Management Options
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Author : Ines, A. V. M.Droogers, P.Makin, I. W.Das Gupta, A.
language : en
Publisher: IWMI
Release Date : 2001
Crop Growth And Soil Water Balance Modeling To Explore Water Management Options written by Ines, A. V. M.Droogers, P.Makin, I. W.Das Gupta, A. and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Crops categories.
The study was on the performance of the decision support system for agrotechnology transfer (DSSAT) and the soil water atmosphere plant (SWAP) under an acid sulphate soil. The comparison of these models was done as a prerequisite to the selection of an appropriate model, which is capable of simulating water management scenarios, water balance and crop growth, to be coupled with an adaptive optimization algorithm that can be used to explore water management options.
Assessment Of Irrigation Return Flow Models
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Author : Wynn R. Walker
language : en
Publisher:
Release Date : 1976
Assessment Of Irrigation Return Flow Models written by Wynn R. Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Drainage categories.
Modeling Economic Management And Policy Issues Of Water In Irrigated Agriculture
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Author : Ariel Dinar
language : en
Publisher: Bloomsbury Publishing USA
Release Date : 1996-08-23
Modeling Economic Management And Policy Issues Of Water In Irrigated Agriculture written by Ariel Dinar and has been published by Bloomsbury Publishing USA this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-08-23 with Political Science categories.
This work presents models that characterize the relationships between quantity and quality of irrigation water application, and agricultural production and the environment. A comprehensive modeling approach addressing both the benefits of irrigation and the potential negative effects is introduced. Physical-biological concepts are combined with economic and engineering principles to demonstrate the usefulness of the model for analyzing various water management and policy issues. Decision makers on all levels should find the modeling approach interesting and useful in the management issues from the farm to national levels.
Water Requirements For Irrigation And The Environment
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Author : Marinus G. Bos
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-11-23
Water Requirements For Irrigation And The Environment written by Marinus G. Bos and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-23 with Technology & Engineering categories.
Irrigated agriculture produces about 40% of all food and fibre on about 16% of all cropped land. As such, irrigated agriculture is a productive user of resources; both in terms of yield per cropped area and in yield per volume of water consumed. Many irrigation projects, however, use (divert or withdraw) much more water than consumed by the crop. The non-consumed fraction of the water may cause a variety of undesirable effects ranging from water-logging and salinity within the irrigated area to downstram water pollution. This book discusses all components of the water balance of an irrigated area; evapotranspiration (Ch.2), effective precipitation (Ch.3) and capillary rise from the groundwater table (Ch.4). Chapter 5 then combines all components into a water management strategy that balances actual evapotranspiration (and thus crop yield) with the groundwater balance of the irrigated area (for a substainable environment). Chapter 6 presents CRIWAR 3.0, a simulation program that combines all water balance components into a single simulation procedure. The chapter describes the use of the CRIWAR software for developing water requirement tables and other useful information based on the selected water management strategy. This version greatly expands upon the capabilities of previously published programs.
Estimating Productivity Of Water At Different Spatial Scales Using Simulation Modeling
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Author : Peter Droogers
language : en
Publisher: IWMI
Release Date : 2001
Estimating Productivity Of Water At Different Spatial Scales Using Simulation Modeling written by Peter Droogers and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Hydrologic models categories.
A clear understanding of the current water balance is required to explore options for water saving measures. However, measurement of all the terms in the water balance is infeasible in terms of spatial and temporal scale, but hydrological simulation models can fill the gap between measured and required data. For a basin in Western Turkey, simulation modeling at three different scales, field, irrigation scheme and basin scale, was performed to obtain all terms of the water balance. These water balance numbers were used to calculate the Productivity of Water at the three spatial levels distinguished to assess the performance of the systems.
Spatial Irrigation Management Using Remote Sensing Water Balance Modeling And Soil Water Content Monitoring
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Author : J. Burdette Barker
language : en
Publisher:
Release Date : 2017
Spatial Irrigation Management Using Remote Sensing Water Balance Modeling And Soil Water Content Monitoring written by J. Burdette Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Agricultural engineering categories.
Spatially informed irrigation management may improve the optimal use of water resources. Sub-field scale water balance modeling and measurement were studied in the context of irrigation management. A spatial remote-sensing-based evapotranspiration and soil water balance model was modified and validated for use in real-time irrigation management. The modeled ET compared well with eddy covariance data from eastern Nebraska. Placement and quantity of sub-field scale soil water content measurement locations was also studied. Variance reduction factor and temporal stability were used to analyze soil water content data from an eastern Nebraska field. No consistent predictor of soil water temporal stability patterns was identified. At least three monitoring locations were needed per irrigation management zone to adequately quantify the mean soil water content. The remote-sensing-based water balance model was used to manage irrigation in a field experiment. The research included an eastern Nebraska field in 2015 and 2016 and a western Nebraska field in 2016 for a total of 210 plot-years. The response of maize and soybean to irrigation using variations of the model were compared with responses from treatments using soil water content measurement and a rainfed treatment. The remote-sensing-based treatment prescribed more irrigation than the other treatments in all cases. Excessive modeled soil evaporation and insufficient drainage times were suspected causes of the model drift. Modifying evaporation and drainage reduced modeled soil water depletion error. None of the included response variables were significantly different between treatments in western Nebraska. In eastern Nebraska, treatment differences for maize and soybean included evapotranspiration and a combined variable including evapotranspiration and deep percolation. Both variables were greatest for the remote-sensing model when differences were found to be statistically significant. Differences in maize yield in 2015 were attributed to random error. Soybean yield was lowest for the remote-sensing-based treatment and greatest for rainfed, possibly because of overwatering and lodging. The model performed well considering that it did not include soil water content measurements during the season. Future work should improve the soil evaporation and drainage formulations, because of excessive precipitation and include aerial remote sensing imagery and soil water content measurement as model inputs.
Modeling Water Resources Management At The Basin Level
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Author : Daene C. McKinney
language : en
Publisher: IWMI
Release Date : 1999
Modeling Water Resources Management At The Basin Level written by Daene C. McKinney and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Groundwater categories.
The world is facing severe and growing challenges in maintainig water quality and meeting the rapidly growing demand for water resources. In addition, water used for irrigation, the largest use of water in most developing countries, will likely have to be diverted increasingly to meet the needs of urban areas and industry whilst remaining a prime engine of agricultural growth. Finally, environmental and other in-stream water demands become more important as economies develop. The river basin has been acknowledged to be the appropriate unit of analysis to address these chanllenges facing water resources management: and modeling at this scale can provide essential information for policy makers in their decisions on allication of resources. This paper reviews the state of the art of modeling approaches to integrated water resources management at the river basin scale, with particular focus on the potential of coupled economic hydrologic models, and concludes with directions for future modeling exercises.
Managing Irrigated Agriculture To Improve Water Quality
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Author :
language : en
Publisher:
Release Date : 1972
Managing Irrigated Agriculture To Improve Water Quality written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Irrigation categories.