The effects of chemical fertilizers as additives on the growth of earthworm and the utility of the dung of earthworm

This thesis analyzed the effects of three chemical fertilizers-Ca(H2PO4)2,K2SO4,KCl—functioning as additives on the growth of earthworm and the utility of the dung of earthworm.The trial in this thesis manifested that the three fertilizers could function as additives.According to the study of the growth and breeding of earthworm and the utility of the dung,a generate conclusion was made: 0.75 g·kg-1(P2O5)of Ca(H2PO4)2 was the best added amount,which the best effects on earthworm;0.75 g·kg-1(K2O)of K2SO4 was the best added amount as well;0.50 g·kg-1(K2O)of KCl was the best effects on earthworm.But the overuse of additive was harmful to earthworm.For instance,the amount over 2.0 g·kg-1 of Ca(H2PO4)2,2.0 g·kg-1 of K2SO4 and 0.75 g·kg-1 of KCl were all inducing the amount of survive and breeding of earthworm.As for KCl,2.0 g·kg-1 was the maximums amount that earthworm could bear.The dung of the well-growing earthworms could able to advance the germinating ability of spinach,and at the meantime improve its germination percentage.