基于ISAREG模型的小麦间作玉米优化灌溉制度研究

以内蒙古河套灌区农业综合节水示范区小麦间作玉米实测资料为基础,运用Penman-Monteith法确定了参考作物蒸发蒸腾量。考虑间作条件的立体种植特征,确定了小麦间作玉米的综合作物系数。同时利用ISAREG模型对小麦间作玉米灌溉制度进行了评价,得到连续中旱处理关键生育期97mm处理在全生育期深层渗漏量为2.67%,灌水效率为99.42%,产量下降11.50%,较其他7个处理合理。根据作物在不同时期作物需水强度运用ISAREG模型模拟优化灌溉制度,获得适合当地的优选灌溉制度,即全生育期灌水5次,灌水时间分别为5月10日、5月24日、6月17日、7月10日、7月30日,灌水定额分别为75、80、90、90、80mm,为灌区节水优化管理提供了技术支持。

Crop water Requirement and Optimization of Irrigation System of Intercrop Wheat and Maize by ISAREG Model

Based on the field measured data of wheat intercropping maize in comprehensive agricultural water saving demonstration area in Hetao district,the reference crop evapotranspiration of interplanted crop was computed according to the Penman-Monteith method.Considering the characteristics of interplanting,the comprehensive crop coefficient was settled.Meanwhile,the irrigation system of wheat intercropping maize was evaluated by WIN ISAREG model,The deep seepage quantity was 2.67%,irrigation efficiency was 99.42%,and the yield by rate was 11.50% of test MY2 in the whole growth stage,it was better than other tests but still need to optimization.According to crop having different water demand in different period,we can use ISAREG model to simulate and optimize irrigation system,and got optimization irrigation system that was irrigated 5 times in the whole stages,irrigation time respectively were May 10,May 24,June 17,July 10 and July 30,and irrigation quota respectively were 75 mm,80 mm,90 mm,90 mm and 80 mm.The results can provide the technical support for water saving and optimization management of Hetao irrigation District.