不同机播密度对松玉419产量及其构成因素的影响

Effects of Population on Yield and Yield Components for Songyu 419 with Mechanized Sowing

以松玉419为试验材料，田间设置5万、6万、7万、8万、9万株／hm2五个播种密度，重点研究机播密度对春玉米农艺性状和产量及其构成因素的影响。结果表明，随机播密度增加，松玉419产量呈现先增加后降低趋势，但各处理间无显著差异。松玉419是一个大穗、中等耐密型玉米新品种，在吉林地区最佳种植密度为67762株／hm2（即6．5万-7．0万株／hm2），获得高产的关键栽培措施为降低空秆率、减少秃尖长度。

Songyu419 was used as materials and planted at five density, 50, 60, 70, 80 and 90 thousand plants per hectare. A field experiment was carried out to study effects of plant density on grain yield and yield components of spring maize with mechanized sowing. The results proved that with the increasing of planting density, grain yield increased firstly and then reduced, however there was no significant difference between the treatments. It suggested that the best planting density in Jilin area was 67 762 plants/ha （65-70 thousand plants/ha） for Songyu419, with a big ear and medium resistance to compact planting. We proposed that the key cultivation measures with higher yield were to reduce the percent of empty stalk and the length of bald tip.