Organo-mineral fertilizers - Determination of the chelated micronutrient content and the chelated fraction of micronutrients by treatment with a cation exchange resin; German version CEN/TS 17790:2022
有机矿物肥料.用阳离子交换树脂处理测定螯合微量营养素含量和螯合微量营养素分数;德语版CEN/TS 17790:2022