不同时期氮肥配比对饲用玉米产量和品质的影响

在总纯氮为225kg／hm^2的条件下，研究了不同时期氮肥比对饲用玉米陕310饲用产量和品质及生理特性的影响。结果表明0：10：0和0：5：5处理均可提高饲用玉米全株鲜干物质产量。对饲用品质而言，0：10：0处理能够提高全株粗蛋向和粗脂肪产量，但同时增加了粗纤维产量，导致饲料的消化率降低，饲用品质下降；0：5：5处理可提高全株粗蛋白和粗脂肪产量，但同时又降低了粗纤维产量，进而提高了全株饲用价值。从植株的生理特性分析，0：10：0和0：5：5处理吐丝后期能保持较高的叶面积系数并提高了氮素利用效率，有利于光合产物的积累与运转及饲用产草的提高和品质的改善。

Effects of Proportionate Fertilizing Nitrogen at Different Stage on Yield and Quality of Forage Corn

This experiment studied effects of proportionate fertilizing nitrogen at different stage on yield,quality and physiological characteristic of forage corn Shaan310 with same nitrogen amount of 225 kg/hm².The results showed: Treatments of 0:10:0 and 0:5:5 could increase fresh and dry matter yields of whole plant About forage quality, 0:10:0 could increase CP and EE yields of whole pant, but that also increased CF yields, which led to lowly digestive rate and quality.0:5:5 could increase CP and EE yields of whole plant and decreased CF yields, which led to better quality.Analyzed from physiological characteristic, two treatments could maintain higher LAI and improve nitrogen efficiency, which are beneficial to improve accumulation and transferofmatter, forage yield and quality.