近年来由于熟制改革及其他因素的影响,省内每年都有部分麦田延误播种适期,造成不同程度的减产。但人们对此并未引起足够的注意。迟播减产的主要原因是由于幼穗发育进程加快,生育期短缩,最后导致穗小粒少,产量下降。因此,研究迟播条件下麦类作物幼穗发育特点及促使幼穗发育向良好方向转化的措施,从而变迟播低产为高产,是有一定现实意义的。为此安排了本试验。试验从1979年冬开始至1982年夏结束。1979～1981年主要研究迟播麦幼穗发育特点及与其他器官的相应关系;1981～1982年着重研究早期追肥对迟播麦幼穗发育的影响及对产量的效应。 In recent years, due to the influence of cooked-up reform and other factors, some of the wheat fields in the province have delayed the sowing period each year, resulting in different degrees of yield reduction. But people did not pay enough attention to this. The main reason for late sowing and low yielding is due to the accelerated development of young panicles and the shortened growth period, which eventually leads to fewer spikelets and lower yields. Therefore, it is of practical significance to study the characteristics of young crop development and the promotion of the development of young spikelets to a good direction under late-sowing conditions, which will delay the sowing of low-yielding and high-yielding crops. This experiment was arranged for this purpose. The trial began in the winter of 1979 until the end of the summer of 1982. From 1979 to 1981, the characteristics of development of late spring wheat and its relationship with other organs were mainly studied. From 1981 to 1982, the effect of early top dressing on the development of late spring wheat and its effect on yield were studied.