种植密度对玉米产量及青贮品质的影响

以科多8号青贮专用型玉米（Zea mays）为试验材料，设低(6.80万株/hm2)、中(8.00万株/hm2)、高(9.55万株/hm2)3个种植密度处理，分析种植密度对玉米产量、发酵品质、营养成分、硝酸盐和亚硝酸盐含量的影响。结果表明，低种植密度植株高度、单株叶质量、茎质量均最高，但鲜草产量和粗蛋白产量却低于其他处理；青贮饲料营养成分随密度变化不一致，酸性洗涤纤维含量、中性洗涤纤维含量和粗脂肪含量均随密度的增加而提高，粗蛋白和可溶性碳水化合物随密度的增加而降低；青贮降低了原料的硝酸盐和亚硝酸盐含量，种植密度对硝酸盐和亚硝酸盐含量影响不显著。比较产量、发酵品质、营养成分、硝酸盐类物质含量，中种植密度玉米产量和青贮质量较高，为适宜种植密度。

Effect of plant density on yield and quality of silage corn

An experiment was conducted to determine the effects of plant density(68 000,80 000 and 95 500 plant/ha) on the yield,fermentation quality,nutritional value,nitrate and nitrite of Keduo 8 silage corn.The results of this study showed that plant height,leaf and stem weight of low planting density treatment were the highest,but the fresh forage and crude protein yield was lower than other planting density treatments.The acid detergent fiber(ADF),neutral detergent fiber(NDF) and ether fat(EE) significantly increased and the crude protein(CP) and water-soluble carbohydrates(WSC) decreased as the planting density increased.Ensiling corn reduced the nitrate and nitrite content of herbage and planting density did not affect the nitrate and nitrite content of herbage.Based on the yield,fermentation quality,nutrient content,nitrate and nitrite,80 000 plant/ha was the better planting density.