DIN CEN/TS 17403:2021 肥料. 固体尿素甲醛和亚甲基尿素缓释肥料中冷水不溶性氮和热水不溶性氮的测定以及营养聚合物在100 ℃时pH值为7.5的磷酸盐缓冲溶液中的溶解度的测定; 德文版 CEN/TS 17403-2021
Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with