Connecting Furrow Irrigation Hydraulics And Corn Growth Simulation Models For Irrigation Scheduling
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Connecting Furrow Irrigation Hydraulics And Corn Growth Simulation Models For Irrigation Scheduling
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Author : Ali A. Ikhneifir
language : en
Publisher:
Release Date : 1984
Connecting Furrow Irrigation Hydraulics And Corn Growth Simulation Models For Irrigation Scheduling written by Ali A. Ikhneifir and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Corn categories.
Dynamic Modeling Of Crop Growth And Stochastic Optimization Of Irrigation Scheduling
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Author : Kosuri S. Raju
language : en
Publisher:
Release Date : 1984
Dynamic Modeling Of Crop Growth And Stochastic Optimization Of Irrigation Scheduling written by Kosuri S. Raju and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Corn categories.
Modeling Crop Responses To Irrigation In Relation To Soils Climate And Salinity
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Author : Ronald John Hanks
language : en
Publisher: Pergamon
Release Date : 1980
Modeling Crop Responses To Irrigation In Relation To Soils Climate And Salinity written by Ronald John Hanks and has been published by Pergamon this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Technology & Engineering categories.
Introduction; list of symbols; modeling crop responses to irrigation.
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.
Irrigation Management Optimization Incorporating Equity And Crop Simulation
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Author : Walter Joseph Rachel Buydens
language : en
Publisher:
Release Date : 1992
Irrigation Management Optimization Incorporating Equity And Crop Simulation written by Walter Joseph Rachel Buydens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Water Conservation By Optimal Irrigation Scheduling Based On Corn Dynamic Growth Model
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Author : Eugene Stanley Lee
language : en
Publisher:
Release Date : 1983
Water Conservation By Optimal Irrigation Scheduling Based On Corn Dynamic Growth Model written by Eugene Stanley Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Corn categories.
Models Designed To Efficiently Allocate Irrigation Water Use Based On Crop Response To Soil Moisture Stress
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Author : Raymond Lloyd Anderson
language : en
Publisher:
Release Date : 1977
Models Designed To Efficiently Allocate Irrigation Water Use Based On Crop Response To Soil Moisture Stress written by Raymond Lloyd Anderson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Irrigation categories.
Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County
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Author : Robert Mittelstadt
language : en
Publisher:
Release Date : 1995
Characterizing Hydraulics And Water Distribution Of Furrow Irrigation In Northeast Malheur County written by Robert Mittelstadt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Furrow irrigation categories.
Furrow irrigation is the dominant practice for irrigating row crops in the western Treasure Valley region near Ontario, Oregon. Though improvements have been made in management practices over the years, excessive runoff and deep percolation are still important problems contributing to surface water and groundwater degradation. Field observations were made during two growing seasons to establish a data base from which the hydraulic surface irrigation model, SRFR (SRFR, a computer program for simulating flow in surface irrigation, developed at the U.S. Water Conservation Laboratory in Phoenix, Arizona (Strelkoff, 1991)), could be calibrated. SRFR is a numerical model, based on the principles of open channel hydraulics coupled with an empirical relationship characterizing furrow intake. SRFR is an analytical tool, with which the user supplies the physical parameters (such as furrow shape and furrow intake) and also the management variables (inflow rate and duration of inflow), and a simulation is conducted based on these conditions. Therefore, this model is a tool which provides insight into furrow irrigation processes. More specifically, SRFR can help answer such questions as which factors at the time of the irrigation are most important in determining irrigation performance. Once calibrated for a given set of conditions, various management strategies may be evaluated as to their relative effectiveness. These strategies may include, but are not limited to, cut-back irrigation, surge irrigation, alternating furrow irrigation, and laser-leveling of the field. A broad data-base is necessary for model calibration and to develop an understanding of it's limitations. Measurements of furrow intake, stream advance times, inflow and outflow, hydraulic roughness and furrow shape were obtained from several sites and irrigation events. These sites represent several crops, field lengths, field slopes, and soil textures. Using these data, a model calibration procedure was developed which matched irrigation inflow and outflow volumes and stream advance times for a given irrigation event. The calibration procedure is used to help identify those model input parameters that best describe a given irrigation event. This thesis is to provide a broad understanding of furrow irrigation systems in northeast Malheur County, recommended hydraulic parameters for use with SRFR, and the practical limitations of such hydraulic irrigation models. Irrigation performance is largely determined by the intake characteristics of the soil at the time of irrigation. Field conditions vary greatly depending on the crop, soil moisture, number of irrigations, tractor traffic, field slope, furrow shape and field history. The grower has control over only two variables which determine irrigation performance: inflow rate and duration. A difference in intake and irrigation performance was found to exist between non-wheel and wheel traffic furrows. These differences became less noticeable late in the season. Straw mulching greatly increases the furrow hydraulic roughness and therefore increases stream wetted perimeter and advance time. Vegetative interference from crops such as potato and sugar beets increase furrow hydraulic roughness late in the season. Initially, furrow shape depends on the crop and which cultivating implement is used. Furrow shape may evolve during the growing season depending on field slope, flow velocities, crop stand and the presence of crop residues and straw mulch.
Irrigation And Drainage Engineering
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Author : Peter Waller
language : en
Publisher: Springer
Release Date : 2015-11-18
Irrigation And Drainage Engineering written by Peter Waller and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-18 with Science categories.
This textbook focuses specifically on the combined topics of irrigation and drainage engineering. It emphasizes both basic concepts and practical applications of the latest technologies available. The design of irrigation, pumping, and drainage systems using Excel and Visual Basic for Applications programs are explained for both graduate and undergraduate students and practicing engineers. The book emphasizes environmental protection, economics, and engineering design processes. It includes detailed chapters on irrigation economics, soils, reference evapotranspiration, crop evapotranspiration, pipe flow, pumps, open-channel flow, groundwater, center pivots, turf and landscape, drip, orchards, wheel lines, hand lines, surfaces, greenhouse hydroponics, soil water movement, drainage systems design, drainage and wetlands contaminant fate and transport. It contains summaries, homework problems, and color photos. The book draws from the fields of fluid mechanics, soil physics, hydrology, soil chemistry, economics, and plant sciences to present a broad interdisciplinary view of the fundamental concepts in irrigation and drainage systems design.
Physically Based Modeling Of Furrow Irrigation Systems During A Growing Season
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Author : Thomas Wöhling
language : en
Publisher:
Release Date : 2005
Physically Based Modeling Of Furrow Irrigation Systems During A Growing Season written by Thomas Wöhling and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.