Keywords Spinach;Oxalate;Nitrogen level;Nitrate/ammonium ratio;Pattern of nitrogen supply;Nitrate;Glycolate oxidase;Ascorbate;Oxalate oxidase;

• 菠菜;草酸;硝酸盐;供氮水平;硝/铵比;供氮方式;乙醇酸氧化酶;抗坏血酸;草酸氧化酶;