單項選擇題苗盤入水時,氮、磷、鉀三要素的濃度要求為()

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


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