Effects of Application of Zn,Fe,and Mo on the Alfalfa Yield and Their Contents and Absorption Amounts

Alfalfa is a kind of perennial legume forage and its high yield with high quality production require not only N,P,and K fertilizer but also many microelements.However,there are fewer reports on the effects of application Zn,Fe and Mo on alfalfa yield.The soil of pasture area in Henan province mainly belongs to sandy alluvial soils which are short of Zn,Fe,and Mo elements.In order to obtain optimum fertilization practice,an experiment with completed experimental design was conducted to investigate the effects of application Zn,Fe and Mo on alfalfa yield and their contents and absorption amounts in alfalfa.The results show that the combined application of Zn,Fe,and Mo fertilizer increased the dry matter(DM) yields of alfalfa and single application or two combination of Zn(12 kg·hm-2),Fe(15 kg·hm-2),and Mo(0.5kg·hm-2) fertilizer significantly increased the DM yields of alfalfa(P0.05);especially the combination of Zn(12 kg·hm-2) and Mo(0.5kg·hm-2) fertilizer resulted highest alfalfa DM yield of 7.01 t·hm-2,an increase of 25.40% in comparison with control.The different rations of Zn,Fe,and Mo fertilizer influenced the their contents and absorption amounts in alfalfa,combined application of Zn(12 kg·hm-2),Fe(15 kg·hm-2),Mo(0.5kg·hm-2) fertilizer markedly increased their contents and the absorption amounts of Zn and Mo in alfalfa(P0.05);combined application of Zn and Mo fertilizer markedly increased Zn and Mo's contents and absorption amounts in alfalfa(P0.05);single application of Zn or combined application of Zn and Fe fertilizer markedly(P0.05) increased Zn's content and absorption amount in alfalfa.Single application of Mo or combined application of Mo and Fe fertilizer markedly increased Mo's content and absorption amount in alfalfa(P0.05).However,single application of Fe or combined application of Fe and Zn or Mo fertilizer failed to increase Fe's content and absorption amount of alfalfa.