两种发酵形式有机肥对土壤中微量元素的活化作用

ACTIVATING EFFECT OF TWO KINDS OF FERMENTED ORGANIC FERTILIZERS ON SOME SOIL TRACE ELEMENTS

用好氧、厌氧两种发酵形式的有机肥液处理上海三种不同类型土壤。结果表明:两种有机肥对土壤中的 Cu、Mn、Fe 均有活化作用,对 Zn 的活化作用很弱。好氧液对土壤中 Mn 的活化能力大于厌氧液;而厌氧液对土壤中 Cu、Fe 的活化能力大于好氧液。好氧液对土壤微量元素的活化可能以酸溶作用为主,螯合作用为辅;厌氧液可能以螯合作用为主,氧化还原作用为辅。

Three types of soils with different characters were treated by two solu- tions extracted from anaerobically and aerobically fermented organic fertilizers.It was found that the two solutions had certain activating effect on soil Cu,Mn,Fe and only a little activating effect on soil Zn.The capacity of aerobically fermented organic fertilizer solution for activating soil Mn was bigger than that of anaerobically fermented one ,but the capacity of anaerobically fermented organic fertilizer solution for activating soil Cu and Fe was bigger than that of aerobically fermented one.It is suggested that the mecha- nism of activating soil trace elements by aerobically fermented organic fertilizer solution should involve mainly acidic dissolution and secondarily chelation and that by anaerobi- cally fermented organic fertilizer solution should involve mainly chelation and secondari- ly oxidation-reduction.