单项选择题

A.氮素50mg/kg-100mg/kg;磷素35mg/kg-50mg/kg;钾素50mg/kg-150mg/kg
B.氮素100mg/kg-150mg/kg;磷素50mg/kg-100mg/kg;钾素50mg/kg-150mg/kg
C.氮素15mg/kg;磷素50mg/kg;钾素50mg/kg
D.氮素50mg/kg-100mg/kg;磷素50mg/kg-100mg/kg;钾素100mg/kg-200mg/kg