节水农业和节水灌溉技术讲座■孙建华二、旱地粮食作物栽培需水规律作物需水量又叫田间耗水量，实际上就是作物的生理需水量和生态需水量两部分的总和。１．旱地小麦的需水规律（１）分蘖盘根阶段。这一阶段包括出苗、分蘖、越冬和返青４个阶段，历时１５０ｄ，占总生育期... Water-saving agriculture and water-saving irrigation technology lecture ■ Sun Jianhua Second, the law of dry land for crop cultivation Water demand is also called the field of crop water consumption, in fact, the crop physiological water demand and ecological water demand of the two parts of the sum. 1. Water requirements of dryland wheat (1) tillering and packing stage. This stage includes emergence, tillering, overwintering and rejuvenation four stages, which lasted 150d, accounting for the total growth period ...