晋东南地区麦田水分供需特征及节水灌溉研究

Evaluation of the Characteristics of Water Supplies and Demands in winter wheat Fields and Study on the Economizing Irrigation in the Southeast Prefecture of Shanxi Province

本文在分析晋东南地区降水的季节分布、土壤水分动态和冬小麦需水动态的基础上,通过田间灌溉试验结果,提出减少灌溉定额和灌溉次数,只在关键期进行补充灌溉,冬小麦生育期间的降水和播前土壤储水才能得到充分利用。由于本区冬小麦生育前期浇水的增产效果最好,所以在正常年份,浇足拔节水即可获得较高的产量。

Based on the analysis of the seasonal distribution of rainfall, soil moisture dynamicsand winter wheat water requirements, the results from the field irrigation experimentsunder local climatic conditions, this pater suggests that the reduction of irrigation normand irrigation times be possible only when the supplementary irrigation is carried out inthe critical period and rainfall water in growing period and water stored in soil beforesowing is fully used. Largely owing to the good effect of irrigation upon the yield increaseprior to the developing stage of winter wheat in this region, it is possible to obtain highyields when much irrigation water is put on winter wheat at the elongating stage in thenormal rainfall year.