Pot experiment was conducted to study the effects of three controlled release fertilizers(CRFs)on growth of calla in comparison with common compound fertilizer and to investigate leaching loss rate of nutrients in CRF by measuring nutrients content in leachate.The results indicated that the plant height

growth potential and chlorophyll content in CRF treatments were better than those in common compound fertilizer treatments and control.Changes of pH of leachate were always smooth during the whole growth season of calla because controlled release compound fertilizer could release nutrients slowly

which could reduce the leaching loss rate of N

P

K effectively

provide sufficient nutrients for the flowering of calla

and thus keep balance of the growth of calla.