采收期对青贮玉米品质和产量的影响（英文）

Effects of Different Harvesting Dates on Yield and Quality of Silage Maize

以青贮玉米品种渝青玉3号为研究对象。分5个采收期研究了不同采收期对青贮玉米品质和产量的影响。结果表明：采收期对青贮玉米品质和产量均有不同程度影响。随着采收期推迟．干重一直增加，鲜重不断降低，秸秆中ADF和NDF含量不断增加．粗蛋白含量和IVODM不断降低，粗脂肪含量先升高后下降。籽粒中粗蛋白和赖氨酸含量呈下降趋势。粗淀粉含量呈上升趋势．粗脂肪含量先上升后下降，授粉后27～34d是最佳采收时期。

Using silage maize cuttivar Yuqingyu 3 as the experimental material, the effects of five different harvesting dates on yield and quality of silage maize were in- vestigated. The results showed that the harvesting date posed various effects on quality and yield of silage maize. With the postponement of harvesting date, silage maize exhibited continuously increasing dry weight and gradually declining fresh weight; in maize straws, ADF and NDF contents increased constantly, crude protein content and IVODM decreased gradually, crude fat content increased first and then declined; in maize kernels, crude protein and lysine contents decreased continuously, crude starch content increased gradually, crude fat content increased first and then reduced. In conclusion, silage maize should be harvested at 27-34 d after pollination.