【摘要】 以农菁4号羊草栽培草地为对象,研究了不同施氮期(返青期、拔节期和孕穗期)和施氮量(0kg/hm~2、60kg/hm~2、90kg/hm~2、120kg/hm~2)对羊草生产性能及品质的影响。结果表明:施氮肥有效增加了羊草的产量。其中,返青期施肥的增产效果最好,施氮量为120kg/hm~2(N3)的产量最大,为20488.9kg/hm~2;抽穗期施氮量60kg/hm~2处理的增产效果最好,为62.8kg/kg。施氮肥能够增加羊草的粗蛋白(CP)含量,降低粗纤维(CF)、酸性洗涤纤维和中性洗涤纤维的含量。拔节期施氮肥为90kg/hm~2(N2)的粗纤维含量最低,当施肥量大于90kg/hm~2时,羊草粗蛋白含量显著高于未施肥(N0)。羊草在返青期施氮肥120kg/hm~2可获得较高的产量,在拔节期施氮肥90kg/hm~2可获得较高的品质。更多还原

【Abstract】 The effects of applying N time(turning green,jointing and booting)and N levels(0kg/hm~2,60kg/hm~2,90kg/hm~2,120kg/hm~2)on the yield and quality of Leymus chinensis Nongjing No.4cultivated grassland were studied.The results showed that:nitrogen effectively increased the hay yield of Leymus chinensis Nongjing No.4.Applying nitrogen in turning green period(A1)had the best effect on increasing yield compared with the other two periods(A2 & A3),and the hay yield was the largest(20488.9kg/hm~2)when the applying nitrogen rate was 120kg/hm~2(N3);applying nitrogen at rate of60kg/hm~2(N1)in the heading period(A3)had the best effect on increasing yield(62.8kg/kg).Nitrogen could increase the crude protein(CP)content,but reduced crude fiber(CF),acid detergent fiber(ADF)and neutral detergent fiber(NDF)content.The crude fiber(CF)was the lowest when the nitrogen was applied at the rate of 90kg/hm~2(N2)in early jointing period(A2).The crude protein(CP)were significantly higher when applying nitrogen rate was beyond 90kg/hm~2(N2)than unfertilized(N0).Applying nitrogen at rate of 120kg/hm~2 in turning green period had higher yield,and applying nitrogen at the rate of 90kg/hm~2 in jointing period had a higher quality of Leymus chinensis.更多还原