在MAF和DAP体系中土壤锌吸附的初步研究

本文研究了MAP和DAP对黄土土壤吸附锌的影响及生物效果。结果表明,MAP和DAP磷酸盐可以引起土壤平衡锌溶液pH的变化,从而影响着土壤吸附锌的模式。MAP减弱土壤的吸锌量;相反,DAP降低了锌的活性,增加了固锌量。这种影响对有机质和粘粒含量低的土壤尤为显著。生物试验结果表明,MAP不仅能促进植株对锌的吸收,而且,锌-磷交互效应显著;相反,DAP却减少了锌的吸收。锌-磷交互效应低。

PRIMARY STUDY ON ZINC ADSORBED BY SOIL IN SYSTEM OF MAP AND DAP

The paper deals with the effect of MAP and DAP on zinc adsorbed by loess soil and the biological effect of MAP and DAP.The results show that the zinc-adsorption diagrams of loessial soil was similao to chat of Tucson loam in steeps obtained by Udo,E.J.The amount of zinc adsorbed by soil was effected by pH of different equilibrium Zn solutions of soil.The amount of zinc adsorbed by the parent materialwas higher than those by argillic horizon and rusEy dark loessial soil.MAP and DAP application had an important effect on the model of zinc adsorbed by soil.The amount of zinc adsorbed by soil was decreased by MAP application.Hovveverr the amount of zinc adsorbed by soil was increased by DAP application.The effects of MAP and DAP were specially obvious in the loessial soils with lower contents of O.M.and clay.The pH in two different system was a leading factor to control zinc adsorbed by soil,but the change of pH was affected by phosphate form.The results show that MAP could promote the adsorption of zinc by plant the interaction between zinc and phosphous,but DAP could decrease the amount of zinc adsorbed by plant and weaken the interaction between zinc and phosphate.Therefore,the zinc fertilizer applied togather with MAP is more beneficial than with DAP in the loessial soils deficient in zinc and phosphorus.