【摘要】 以青贮玉米豫青贮23和曲辰9号为材料，探讨播期和施氮水平对产量和饲用价值的影响。结果表明，6月初播种相较于7月初，产量与粗蛋白含量更高，纤维含量更低，饲用价值更优。施氮水平与产量、粗蛋白含量成正比，对饲用价值有显著影响。两个品种产量差异不显著，豫青贮23的营养指标和饲用价值显著高于曲辰9号。青贮玉米产量和品质存在权衡，产量提高伴随粗蛋白含量下降与纤维含量上升，导致饲用价值降低。更多还原

【Abstract】 Taking the silage corn varieties Yuqingzhu 23 and Quchen 9 as experimental materials, the effects of sowing dates and nitrogen application levels on yield and feeding value were explored. The results showed that silage corn sown in early June produced higher yield and crude protein(CP) content than that sown in early July, with lower acid detergent fibre(ADF) and neutral detergent fibre(NDF) content, and higher relative feeding value(RFV)and forage grading index(GI). Nitrogen application level was proportional to yield, CP and NDF contents, and had significant effects on the RFV and GI values. The yield difference between the two varieties was not significant, but the nutritional indices and feeding value of Yuqingzhu 23 were significantly higher than Quchen 9. There was a trade-off relationship between dry matter yield and quality of silage corn, with increased yield accompanied by a decrease in CP content and an increase in ADF content, thereby resulting in a decrease in feeding value.更多还原