Nutrient absorption and yield of rape under coupled application of phosphate rock and sulfur

The results of two field experiments on paddy soil from quaternary red clay treated with phosphate rock(PR) and elemental sulfur(ES) indicate that Gafas phosphate rock (GPR),Kunyang phosphate rock(KPR) and single supper phosphate(SSP) applications respectively increase rape grain yield by 22.2～23.2,13.7～ 13.9 and 21.2 folds as comparison with CK.GPR and KPR mixed with ES enhance the increasing effects of PR on yield.KPR,GPR and SSP application respectively increases P absorption of rape by 6.7,15.8,and 13.8 folds,whereas GPR and KPR mixed with ES increases P absorption by 69.2% and 11.4%.Application of GPR,KPR and SSP or their combination with PR and ES increases available S content in plowed layers,but does not increase available P.