我们所说的玉米生育后期,是指玉米从开花授粉以后到成熟这一个阶段。这是玉米的经济产量形成期。这一阶段的时间虽然不长(只占整个生育日数的三分之一多一点),但在产量形成中却起着很大的作用,后期形成的干物质占全部生物产量的二分之一以上,甚至有达到三分之二的。而且更值得指出的是,玉米后期干物质积累量几乎与穗粒中干物质数量相等。因此,一般地讲,凡是后期形成干物质量多的,其生物产量和经济产量就高;反之则低。但是,当前在生产中则恰恰对玉米生育后期很不重视。一般到了玉米开花授粉以后,就不闻不问,任其自然,而前期采取技术措施时又没有充分考虑后期 What we are talking about later stage of maize growth refers to the corn from the flowering pollination to maturity after this stage. This is the corn’s economic yield formation period. Although this period of time is not long (only a little more than one third of the total number of birth days), it plays a large role in the formation of the crop, with the latter forming one-half of the total biomass Above, even up to two-thirds. It is also worth pointing out that the amount of dry matter accumulated late in maize is nearly equal to the amount of dry matter in the grain of the ear. Therefore, generally speaking, all those who produce more dry matter in the later stage have higher biological yield and economic output, and vice versa. However, the current production is very little emphasis on late maize growth. Generally to the corn flowering pollination, it indifferent, let it be natural, but did not take full account of the technical measures of late