黑龙江省玉米栽培面积较大,历年播种面积均在180～200万公顷,传统上多实行70厘米行距大垄栽培,每亩保苗2000～2700株,偏于稀植,漏光损失严重。这种种植方式影响了玉米产量的进一步提高,不能充分发挥玉米的增产潜力,尤其是在我省北部冷凉地区表现尤为明显。第三积温带以北的许多县份,玉米亩产只有200公斤左右,其低产原因之一就是大垄稀植。为了大幅度提高玉米单产,发挥玉米群体增产效益,我们于1988～1989年研究示范了少耕平播密植 Heilongjiang Province, corn cultivation larger area, calendar year sown area of ​​180 to 2 million hectares, traditionally practiced 70 cm row wide ridge cultivation, seedling per acre 2000 ~ 2700, partial to sparse planting, serious loss of light leakage. This planting method has affected the further improvement of corn yield, can not give full play to the yield potential of corn, especially in the cold northern region of our province is particularly evident. The third accumulated temperature in many counties north of the area, per mu yield of only about 200 kg, one of the reasons for the low yield is big ridge sparse planting. In order to significantly improve yield per unit area of ​​maize and give play to the yield-increasing benefits of maize population, we studied the effects of planting and planting