缺氮、磷、钾、钙、镁对芥蓝硝酸盐积累、硝酸还原酶和过氧化物酶活性的影响

• EFFECT OF N,P,K,Ca AND Mg DEFICIENCY ON NITRATE ACCUMULATION,NITRATE REDUCTASE AND PEROXIDASE ACTIVITY IN CHINESE KALE