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采用盆栽方法,研究了不同氮肥用量对紫花苜蓿鲜、干草产量及饲用营养品质的影响。结果表明:在相同磷钾肥条件下,施氮肥可同时提高鲜草与干草产量,除第一茬外,第二、三、四茬,中氮(0.18 g·株-1)比高氮(0.36 g·株-1)对生物量的影响显著,且随收获次数的增加,不施氮(0 g·株-1)处理的鲜、干草产量较施氮下降快;中氮水平较高氮水平更利于提高粗蛋白(CP)、粗脂肪(EE)与粗灰分(CA)含量及产量,降低粗纤维(CF)含量,改善适口性,提高消化率,并增加总能量(GE)的产量;不同氮肥用量对苜蓿饲用营养品质的影响时期不同,中氮水平可以降低收获中期纤维蛋白比,提高饲草饲料的营养品质,高氮水平则利于降低植株初期与收获后期纤维蛋白比,提高饲草营养品质。
Pot experiments were conducted to study the effects of different nitrogen rates on fresh and hay yield and feed nutritional quality of alfalfa. The results showed that under the same phosphorus and potassium fertilizers, nitrogen and nitrogen could increase the yield of fresh grass and hay at the same time. In addition to the first crop, the second, third and fourth crop, the middle nitrogen (0.18 g · plant -1) g · strain -1) had a significant effect on biomass. With the increase of harvest times, the fresh and hay yield decreased faster than that of nitrogen application under no nitrogen application (0 g · plant -1) But also increase the content and yield of crude protein (CP), crude fat (EE) and crude ash (CA), reduce crude fiber (CF) content, improve palatability, increase digestibility and increase total energy (GE) The effects of different nitrogen fertilizer rates on alfalfa feeding nutritional qualities were different. The middle nitrogen level could reduce the mid-harvest fiber protein ratio and improve the nutritional quality of fodder forage. The high nitrogen level would reduce the ratio of fiber to protein in the early and late harvest, Grass nutrition quality.