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The Research of Using and Predigesting Crop Simulation Model in Winter Wheat

Author: WangWei
Tutor: HuangYiDe；HuangWenJiang
School: Anhui Agricultural University
Course: Crop Cultivation and Farming System
Keywords: Crop simulation models CERES-Wheat model Yield forecast predigestion
CLC: S512.11
Type: Master's thesis
Year: 2009
Downloads: 133
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Abstract


It is important obtaining yield information for our country cereal grain processing companies and our farmers timely and precisely. This even means much to commercial interests of our country in world grain trade market. Wheat is one of the three major crops in our country which provide 95% part of the whole crop production .Based on climate, condition of soil and management of the experiments, Crop simulation models describe growth and development characteristics in crop. At present, using crop simulation model for yield forecast is in hot research areas. In order to solve problems in researches of this field of domestic and abroad, based on the technology and information we already have, this study focused attention upon the calibration of crop simulation model, tried to use the model for winter wheat yield in Beijing, then started to predigest the model in theory. This essay contained two parts:(1)making use of experiment data of Beijing XiaoTangshan precision agriculture demonstration bases and Beijing (Tongzhou, Miyun and Daxing county),this study calibrated CERES-Wheat model with data from 2004-2005, validated the model in growth stage, leaf area index and yield by using 2005-2007 field experiment data and the applicability of the model in other regions in Beijing, got the winter wheat yield of 2008,then compared yield forecast precision in different growth stages by using the climate data from 1978-2008.(2) before use Crop simulation models ,we have to input lots of parameters. winter wheat has a long growth period. So that need a lot of time. In order to reduce the work and short the inputting time, this study analysis the effect of the intimidation of H2o and N to LAI and crop production. Then predigest the model in theories .what we got will benefit next researches of the model .Through this work, some results were turned out:(1)The simulated winter wheat yield of Beijing in 2008 is 6000kg/ hm2 (2) The simulated results of leaf area changes, growth stage shows well, the model can used to simulated the growth of winter wheat.(3)The RMSE of simulated LAI and observed LAI all below 0.5,the results are good.(4)Simulated yield are a little higher than the observed ,but show good match.(5)Based on analysis of the effect of intimidation of H2O and N, the model can be predigested in some sectors.

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CLC: > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat > Winter wheat
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