【摘要】 以豫青贮23、京科516、晋单42、农大108为试验材料，通过设置4个种植密度(5.0万、6.0万、7.0万、8.0万株/hm~2)和4个氮肥施用水平(150、180、210、240 kg/hm~2)，研究青贮玉米种植密度、施氮量对产量及饲用营养品质的影响。结果表明，豫青贮23和晋单42在密度6.0万株/hm~2、施氮180 kg/hm~2时干物质产量最高；京科516和农大108在密度7.0万株/hm~2、施氮180 kg/hm~2时干物质产量最高。4个品种密度在7万株/hm~2时粗蛋白质含量、粗脂肪含量、粗灰分含量显著高于其他处理，粗纤维含量随着密度的增加而提高。吉林省中西部旱作雨养农业区青贮玉米适宜的种植密度为7.0万株/hm~2、施氮量为180 kg/hm~2。更多还原

【Abstract】 To clarify the effects of planting density and nitrogen application rate on the yield and forage nutritional quality of silage maize, this experiment used four varieties, namely Yuqingzhu 23, Jingke516, Jindan 42, and Nongda108. Four planting densities, 50 000, 60 000, 70 000, and 80 000 plants/ha, and four nitrogen application levels, 150, 180, 210, and 240 kg/ha, were set up. The research results showed that Yuqingzhu 23 and Jindan 42 had the highest dry-matter yield at a density of 60 000 plants/ha and a nitrogen application rate of 180 kg/ha;Jingke516 and Nongda108 had the highest dry-matter yield at a density of 70 000 plants/ha and a nitrogen application rate of 180 kg/ha. The crude protein content, crude fat content, and crude ash content of the four varieties were significantly higher at a density of 70 000 plants/ha than those in other treatments. Moreover, the crude fiber content increased with the increase in density. A comprehensive analysis showed that the suitable planting density for silage corn in the dry-land rain-fed agricultural area in the central and western parts of Jilin Province is 70 000 plants/ha,and the nitrogen application rate is 180 kg/ha.更多还原