Effects of zinc, iron, molybdenum fertilizers on the yield and quality of alfalfa

In order to meet the microelement requirement of alfalfa (Medicago sativa) for improving the quality of alfalfa, the effects of zinc (Zn), iron (Fe) and molybdenum (Mo) fertilizers on the yield and quality of alfalfa in very leanness soil were studied by field trial. The results showed that the application of Zn, Fe and Mo could significantly increase the yield, and the effect was the best when only Fe was applied (Fe 15 kg/hm2), or Zn and Mo were applied together (Zn 12 kg/hm2, Mo 0.5 kg/hm2), the yield could be increased by 15.9% and 5.9% respectively. While only Fe or Mo was applied, and Zn and Mo were applied together, the yield of crude protein could be significantly increased. Applying micronutrient fertilizers could significantly reduce the contents of crude fat and Ca; but no affect on contents of crude fiber, crude ash and nitrogen free extract; and increase the content of P.