Soil fertility characteristics of litchi orchard and integrated effects of specialized fertilizers

The soil fertility characteristics of litchi orchard and its integrated effects of specialized fertilizers were studied．The results show that the soll fertility indices between the soil within the tree circle(tree-circle soil)and that outside the tree circle(bare soil)are much different，the available P and K of the former are increased by 341．27％ and 683．77％ than those of the latter respectively．The medium fertilization treatment can improve the soil fertility indices within tree circles，balance the nutritional status of litchi leaves，and reach the best fruit-setting status．Some suggestions of changing the recipe of the specialized fertilizer for green-food litchi are put forward，that is，the ratios of P and K are appropriately decreased in the specialized fertilizer，especially in the fertilizers for promoting shots and flowers．