我们在1972—1975年进行了春玉米播期试验。初涉认为,“晋杂1号”玉米应从4月10日开始播种,4月15—20日大种,4月30日播完,最迟要在6月5日以前播完,逐步改变了小满种玉米的老习惯。几年来的试验表明,适期早播有以下好处:籽粒饱潞,产量寓适期早播的玉米,苗期由于温度低,植株地上部生长缓慢,但根系生长速度比较快,能较早地形成大量的根,有利于抗旱、形成壮苗。早播的比晚播的播期提早20多天,但抽雄期两者只相 We conducted spring maize sowing trials in 1972-1975. Beginning of the book that the “Jin hybrid 1” corn should be sown from April 10, April 15-20 large species, April 30 sown, no later than June 5 broadcast finished, and gradually changed Small old corn habit. Tests over the past few years showed that the benefits of early sowing the following benefits: full grain Lu, yield suitable early sowing corn, the seedling stage due to low temperature, slow growth of plant shoots, but the root growth rate faster, earlier The formation of a large number of roots, is conducive to drought, strong seedlings formed. Early sowing sowing earlier than the sowing more than 20 days, but tasseling both only phase