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自1971年推广玉米小棵密植以来,面积不断扩大,产量不断提高。1975年小棵密植杂交种面积达10,063亩,虽然遇到了高温干旱,但平均亩产仍达634斤。所谓小棵密植,就是选用棵矮、叶窄的品种,加大单位面积的玉米株数,利用群体的优势,达到增产的目的。过去我们用的晚熟品种,株高一般在2.3—2.7米,每亩留苗1,500—2,500株;现在我们实行小棵密植用的品种,株高都在2.3米以下,密度达到3,500株以上,有的可达6.000株。根据我们这里无霜期只有125天左右,5—9月份积温只有2,553.6—
Since the popularization of small corn planting in 1971, the area has been continuously expanded and the output has been continuously increased. In 1975, a total of 10,063 mu of small densely populated hybrids were found. Despite the high temperature and drought, the average mu yield still reached 634 kg. The so-called small densely poplar, is the choice of short trees, leaves narrow varieties, increase the number of corn per unit area, the use of group advantages to achieve the purpose of increasing production. In the past we used the late-maturing varieties, plant height is generally 2.3-2.7 meters, 1,500-2,500 acres per mu seedlings; now we implement the small densely populated varieties, plant height of 2.3 meters below the density of 3,500 or more, there are Up to 6.000 strains. According to our frost-free period here only about 125 days, May-September accumulated only 2,553.6-