Abstract: The effects of combined application of Zinc (Zn),Iron(Fe),and Molybdenum(Mo) fertilizers on the forage yield and quality of alfalfa were studied by the field experiment.The results indicate that microelement fertilizers could remarkably increased the 1st cut forage yield of alfalfa by 18.1% when the application amounts were Zn 5 kg· hm^-2,Fe 7.5 kg· hm^-2,and Mo 0.45 kg· hm^-2.But there were no significant effect on the yields of 2^nd,3^rd,and 4^th cut.Among the three microelements,Zn fertilizer had significant effect to increase forage yield,but Fe and Mo fertilizer not.Reasonable combined application of microelement fertilizers significantly increased the feeding value of alfalfa,i.e.higher contents of crude protein(CP),crude fat(EE) and Ca,and lower content of crude fiber(CF),when the applied amounts were Zn 10 kg· hm^-2,Fe 15 kg· hm^-2,and Mo 0.225 kg· hm^-2.All of the three microelement fertilizers could increase the quality of alfalfa;the effect of Zn fertilizer was considerable,but those of Fe and Mo fertilizer insignificant.

Key words: Alfalfa, Zinc, Iron, Molybdenum, Forage yield, Alfalfa quality

摘要： 采用大田试验,研究锌、铁、钼配合施用对紫花苜蓿产草量和品质的影响。结果表明:施用微量元素肥料能显著提高第1茬苜蓿产草量,当施用锌5 kg/hm²、铁7.5 kg/hm²、钼0.45 kg/hm²时,苜蓿能增产18.1%;配合施用微肥对第2、3、4茬以及苜蓿年总产草量没有明显的增产效果。3种元素中,锌的增产效果较好,而铁和钼的效果不明显。合理施用微肥能明显提高苜蓿的饲用价值,当施用锌10 kg/hm²、铁15 kg/hm²、钼0.225 kg/hm²时,能显著提高粗蛋白、粗脂肪的含量,降低粗纤维含量,提高钙含量;3种元素对苜蓿品质均有明显影响,其中锌的影响最大,而铁钼的影响较小。

关键词: 紫花苜蓿, 锌, 铁, 钼, 产草量, 牧草品质