Using a system model to maximize water use efficiency through optimizing management inputs and scheduling of limited irrigations for site-specific weather and soil conditions.

Book Title: NA
Year Published: 2008
Month Published: NA
Author: Ahuja, L. R. ; Saseendran, S. A. ; Ma, L. ; Nielsen, D.C. ; Trout, T.
Book Group Author: NA

This paper describes a study which employed a system model to explore different options for optimal management of limited irrigation water for growing maize in the Central Great Plains. The CERES-maize model was calibrated and validated for both dryland and irrigated maize production with experimental data from Akron, Colorado, USA. The model was then used with a 94-year weather records to determine: (a) optimum allocation of limited irrigation between vegetative and reproductive growth stages, along with optimum amount of N to apply; (b) effect of soil water content at planting on maize yield; and (c) optimum soil water depletion level for initiating limited irrigation, over the long term. For part (a), several different levels of limited irrigation were simulated for their effect on maize yield and N balance. Results on simulated grain yield response under different intensities of irrigation, and simulated average N leached, residual soil N at crop harvest, and plant N uptake are presented in figures. The results derived are specific to weather and soil conditions at Akron, Colorado, wherein a validated model is an excellent tool to develop such guides for different locations.

Pages: 125
URL: http:////,ip,url,cpid&custid=s4640792&db=lah&AN=20093324124&site=ehost-live
Volume: NA
Number: NA
Journal: Proceedings of the World Environmental and Water ResourcesCongress, Honolulu, Hawai'i, USA, 12-16 May, 2008
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 9780784409763

application rates, crop yield, growth, irrigation,irrigation scheduling, leaching, maize, models, nitrogen fertilizers,nutrient balance, nutrient uptake, plant water relations, simulationmodels, soil water content, water use, water use efficiency, Colorado,USA, Zea mays, Mountain States of USA, Western States of USA, USA, NorthAmerica, America, Developed Countries, OECD Countries, Great PlainsStates of USA, Zea, Poaceae, Cyperales, monocotyledons, angiosperms,Spermatophyta, plants, eukaryotes, corn, United States of America,watering, Field Crops (FF005) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Chemistry and Mineralogy(JJ200), Soil Fertility (JJ600), Fertilizers and other Amendments(JJ700), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management], Mathematics andStatistics (ZZ100)

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