A simulation model assisted study on water and nitrogen dynamics and their effects on crop performance in the wheat-maize system: (II) Model calibration, evaluation and simulated experimentation.

Book Title: NA
Year Published: 2009
Month Published: NA
Author: LüHongZhan ; Liang, WeiLi ; Wang, GuiYan ; Connor, D. J. ; Rimmington, G. M.
Book Group Author: NA

The test on the model with data collected from two years' field experiments revealed an ability to satisfactorily simulate crop parameters such as LAI, biomass accumulation and partitioning, yield, and variables influencing crop growth and development as nitrogen uptake by crops and partitioning in different organs, and dynamics of soil water and nitrogen including infiltration and leaching. With the model, crop yield, water use efficiency (WUE), nitrogen use efficiency (NYE) and water-nitrogen leaching at specific soil layers under various water and nitrogen management practices were simulated to provide data used as references for designing sustainable nitrogen and water management practices. The outputs of the simulated experiment with various treatments of irrigation and nitrogen application indicated that crop yield was closely related to water and nitrogen application, crop water use was positively related to irrigation amount, and nitrogen fertilization could improve the crop water use and WUE within certain limits. This is a valuable evidence to be considered in water-saving farming. Nitrogen uptake had a positive relation to nitrogen application, while irrigation to some extent improved its uptake by crops and hence increased NYE. Additionally, irrigation and fertilization had great effects on nitrogen leaching. Thus, in order to improve WUE and NYE, the model showed how nitrogen application and irrigation should be well coordinated.

Pages: 109 - 121
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20093199290&site=ehost-live
Volume: 3
Number: 2
Journal: Frontiers of Agriculture in China
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 1673-7334

biomass production, crop yield, dry matter accumulation, drymatter distribution, infiltration, irrigation, leaching, leaf areaindex, maize, nitrogen, nitrogen fertilizers, nutrient uptake, plantwater relations, simulation models, soil water, use efficiency, wateruse efficiency, wheat, Triticum, Triticum aestivum, Zea mays, Triticum,Poaceae, Cyperales, monocotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Zea, biomass distribution, corn, LAI, soil moisture,watering, Field Crops (FF005) (New March 2000), Plant Physiology andBiochemistry (FF060), Plant Nutrition (FF061), Plant Water Relations(FF062), Plant Production (FF100), Fertilizers and other Amendments(JJ700), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management]

Source: EBSCO
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