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为评价DSSAT模型在黄土高原沟壑地区的适用性，以渭北旱塬雨养农业区域为研究基础，采用DSSAT模型模拟预测当地冬小麦的潜在产量，并将模拟值与实测值进行对比分析，评价了模型在当地的适用性。在完成模型调试的基础上，设定一系列的施肥情景（N1、N2、N3、N4和N5，分别表示纯氮施用量0、45、90、135和180 kg/hm2；M1、M2、M3 和 M4 分别表示有机肥施用量 15 000、30 000、45 000 和 60 000 kg/hm2；P2O5施用量90 kg/hm2），利用DSSAT模型在2006年、2009年和2012年的光照、气温、降雨等不同气象条件下模拟不同氮素水平下的冬小麦产量。结果表明，（1）DSSAT模型对黄土高原沟壑区冬小麦产量的模拟具有较好的适用性。（2）在黄土高原沟壑区，丰水年、平水年和干旱年的最佳氮素配比分别为N4M2处理、N2M2处理和N3M2处理。氮素的适量使用可以促进冬小麦产量的提高，但为了防止土壤潜在污染及资源浪费，应适当控制当地肥料使用。
In order to evaluate the applicability of DSSAT model in the gully region of the Loess Plateau and the rainfed agricultural region in the Weibei dry land, DSSAT model was used to simulate the potential yield of the local winter wheat. The simulated and measured values were compared and evaluated The local suitability of the model. After completing the model debugging, a series of fertilization scenarios (N1, N2, N3, N4 and N5, which represent 0,45,90,135 and 180 kg / hm2 of pure nitrogen, respectively; And M4 represent the application rates of organic fertilizers of 15 000, 30 000, 45 000 and 60 000 kg / hm 2, respectively; and the application rates of P 2 O 5 are 90 kg / hm 2). Using the DSSAT model in 2006, 2009 and 2012, Simulating the winter wheat yield under different nitrogen levels under different weather conditions. The results show that (1) DSSAT model has good applicability to simulate winter wheat yield in the gully region of the Loess Plateau. (2) In the gully region of the Loess Plateau, the best nitrogen ratio in wet years, flat water years and dry years were N4M2 treatment, N2M2 treatment and N3M2 treatment respectively. Appropriate amount of nitrogen can promote the increase of winter wheat yield, but in order to prevent potential soil pollution and waste of resources, local fertilizer should be properly controlled.