不同水肥组合对苜蓿品质的影响

本研究试验地位于河北廊坊中国农业科学院国际农业高新技术产业园北京畜牧所试验基地，采用温室盆栽的试验方法，探讨不同水肥处理对紫花苜蓿（Medicago sativa L.）的营养成分的影响，试验采取完全随机设计，设置4种施肥梯度与3种灌水梯度。结果表明：不同水肥处理对苜蓿的N、P、K含量有显著影响，紫花苜蓿的N、P、K含量都随着施肥量的增大而增加；紫花苜蓿的全年产量与苜蓿的含磷量呈极显著正相关。紫花苜蓿的粗蛋白、粗脂肪含量随着施肥量的增大而增加，而降低了苜蓿的酸性洗涤纤维含量、中性洗涤纤维含量，结合几项指标可知，增加施肥量与高水处理即250 kg·hm^-2的施肥量与85%～90%田间持水量，可以提高苜蓿的品质。

Effects of Different Combination of Water and Fertilizer on Alfalfa Quality

Greenhouse pot experiment was conducted at the Experimental Base of Institute of Animal Scineces of CAAS, Langfang, Hebei Province. The effects of water and fertilizer treatment on quality of alfalfa by completely random design. There are four fertilization gradients and three water gradients. The different water and fertilizer treatment on the content of N, P and K of alfalfa has a significant impact. The contents of N, P and K of alfalfa increased with the increase of fertilization amount. The total yield of alfalfa was positively correlated with the P content of alfalfa. The content of CP and EE of alfalfa increased with the increase of fertilizer application rate, while the content of ADF and NDF was decreased. Compared with several indexes, the best combination of water and fertilizer is 250 kg·hm^-2 fertilizer and 85%～90% of soil holding capacity，can improve the quality of alfalfa.