在小麦栽培过程中,其低位蘖尤其是第一分蘖往往长不出来,形成分蘖“缺位”现象。由于低位蘖成穗率高,所以缺位现象严重的麦田,每亩成穗数少,产量低。所谓分蘖“缺位”,就是按照叶、蘖同伸规律,应长出的分蘖没有长出来。对于分蘖缺位现象已有报导,但尚缺少较为系统的研究。因此,进一步研究分蘖缺位的原因和控制其产生的途径,提出降低低位蘖缺位率的具体栽培术措施,对提高中、低产区小麦生产具有理论 In the process of wheat cultivation, the low tiller, especially the first tiller often grow out, forming tiller “absence” phenomenon. Due to the low tiller into the ear, so absence of serious wheat fields, per acre less spikes, low yield. The so-called tiller “absence”, that is, according to the law of leaves, tillers and extension, should not grow out of tillers. There have been reports on the absence of tillers, but there is still a lack of systematic research. Therefore, to further study the reason of tillering absence and ways to control its production, put forward the specific cultivation measures to reduce the low tillering rate, to improve the middle and low yield wheat production has the theory