自1973年以来,我们连续五年对宁夏引黄灌区春小麦的幼穗分化过程,幼穗分化与植株营养生长之间的关系,影响每穗小穗数和结实粒数的关键时期,以及水、肥、密栽培技术措施对于幼穗分化的影响等进行了研究。通过这些研究,对小麦幼穗分化的分期,在前人工作的基础上进行了补充划分;明确了春小麦幼穗分化各时期的植株外部形态指 Since 1973, we have studied the relationship between spike differentiation process, spike differentiation and vegetative growth of spring wheat in Ningxia Yellow River Irrigation Area, the key period affecting the number of spikelets and grains per panicle, Fertilizer, close cultivation techniques for young panicle differentiation were studied. Through these researches, the staging of wheat spike differentiation was supplemented on the basis of previous work; the external morphology of the plantlets at different stages of spike differentiation of spring wheat