| It is a worldwide problem that, dry and semi-dry lands in the world across more than50countries. There is only15.8%agricultural acreage has the irrigation condition, the rest of agricultural production is relying on natural precipitation. There is a serious shortage of water in Hebei province. The growth period of winter wheat is general in October last year to the following June. This time squarely during the dry season in north China plain, the growth of winter wheat mainly rely on the groundwater irrigation. With the increasing of drought problem in recent years, the determination of irrigation quantity and irrigation time to alleviate the drought disaster losses, and increasing the benefit of irrigation is all the more important.This study discussed the effect of winter wheat in different year types by using WOFOST model. The purpose is determining the optimal irrigation quantity and irrigation time, strive to reaching the irrigation benefit maximization, it is important to alleviate the sharp contradiction of agricultural production and the scarcity of water. By using WOFOST model to simulate the effect of three different precipitation year types (2003/2004,2005/2006,2008/2009) respectively, By simulating of different irrigation schemes, compare the effect on winter wheat of growth with the final yield. This paper also compared the results of the WOFOST simulation with the experimental results, to explore the different influence of period the final yield on the different irrigation time in seedling establishment. The main conclusions are as follows:(1) To achieve the localization model WOFOST by adjusting parameters of winter wheat in Baoding city, Hebei Province.By the recent15years agricultural meteorological observation data and2011-2012winter wheat test data to adjust WOFOST model adaptation and determine the main parameters. Then simulated and validated winter wheat growth and development of2012-2013test data. The results show that the model can mainly reflect the winter wheat growth and estimate yield.(2) This study is to reveal the change rule of winter wheat production between the irrigation time and irrigation quantity, determines the optimal irrigation scheme. Providing the theory basis for high yield for the drought of baoding city, hebei province.①If the whole growth period irrigating once, irrigation in different time lead to the final output is different, irrigating on the vigorous growth period of winter wheat is important to the formation of final yield. If you only have a chance to irrigation, irrigating on heading stage to grouting period is most effect on actual production, increase irrigation quantity also have effect on the improvement of production. In years when the precipitation is less, the irrigation is the greater the impact on production.②Two irrigation simulation in the whole stages:The more irrigation water can get the greater contribution to wheat production. However, in the growing shortage of water in hebei province, a single irrigation increase more than100mm irrigation quantity was unable to get more obvious contribution to the production, the appropriate irrigation schemes can be less irrigation quantity obtain greater economic benefits. If the whole growth period irrigating twice, scheme17(jointing stage and milking stage) or scheme19(booting stage and filling stage) irrigation70-100mm, guarantees the high yield and can ensure the water-saving irrigation, also can achieve the optimal irrigation effect.③Irrigation three times in the whole stages:The irrigation schemes32(jointing stage and booting stage and filling stage) is the best solution, according to the different type choice of40-70mm range of irrigation amount, and ensure the water-saving irrigation.④The optimal time of seedling establishment period:through the comparison between the experimental results and the simulation results, a preliminary conclusion, the irrigation time in seedling establishment is in the temperature of5-7℃. |
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