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去冬低温来的早、地墒差,造成二、三类麦田分蘖少、次生根短、抗冻力差,加强对小麦春季的田间管理则显得十分重要。从返青到孕穗期小麦生长特点是,由冬季的下长上不长转化为上下一齐长出现新分蘖,叶片增多,茎秆伸长发粗,小穗分化,以营养生长为主,生殖生长同时进行,并逐步转变到生殖生长为主。拔节进入两极分化,促进大分蘖,达到合理头数,需水需肥量最大,约占整个生长期的40～50％。早灌返青水,晚灌拔节水,巧灌麦黄水,是争取穗大粒多、高产稳产的关键。
Early winter to low temperature, poor soil moisture, resulting in two or three types of wheat less tillering, short secondary roots, frost resistance is poor, to strengthen the wheat field management in spring is very important. From returning to greening to booting wheat is characterized by the growth of the winter from the next long on the long-term growth of new tillers grow together, increased leaves, stem elongation coarse, spikelet differentiation to vegetative growth, reproductive growth at the same time , And gradually shifted to reproductive growth. Jointing into the polarization, and promote large tillers, to achieve a reasonable number of heads, water needs to be the largest amount of fertilizer, accounting for 40 ~ 50% of the entire growing season. Early irrigation back green water, irrigation and irrigation late irrigation, clever filling yellow wheat water is to fight spike big grain, the key to high and stable yield.