云南玉米需水规律及灌溉效应的试验研究

基于玉米苗期控水试验和玉米需水量田间试验，分析研究了土壤含水量和灌溉对出苗率、成活率、有效株数和玉米产量经济性状的影响，得到了云南玉米生长季内各月平均日需水量和玉米作物系数。研究认为，苗期灌溉或降水条件好能确保基本的有效株数，促进营养生长；在光照条件好但干旱缺水年份，灌溉的增产效益十分突出；但在干旱缺水影响较小的条件下，玉米灌溉的增产效益并不显著。

Experimental Studies on the Orderliness of Water Requirement and Irrigating Effects of Maize in Yunnan

Based on filed experiments of controlling water during seedling session and of water requirement of maize growth, the influence of soil moisture and irrigation on seedling rate, surviving rate, the number of resultful plants, and the economical turnout characters of maize were analyzed. Average daily crop water requirement and crop coefficient were given out. It was concluded that irrigation or abundant rainfall within seedling session could ensure adequate number of resultful seedlings and hasten the nutrition growth; Under the condition of sufficient sunshine but lacking water, the benefit of increasing yield by irrigation is obvious, while under the condition of little influence of irrigation, it is not.