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在１００℃、６ｍｏｌ／Ｌ的硫酸作用下，含硬质粗蛋白很高的羽肠粉经１０ｈ水解可制得氨基酸态氮含量为５．２ｍｇ／ｍＬ的氨基酸。其水解液中的酸可用氧化钙中和至微酸性（ｐＨ＝２～４）。过滤后的滤液经稀释做为农作物叶面喷施的有机液体肥，而剩余的滤渣亦可做缺硫土壤用的固体肥料。
At 100 ℃, under the action of 6mol / L sulfuric acid, the amino acids with the amino acid nitrogen content of 5.2mg / mL can be obtained after 10h hydrolysis of the sauerkraut powder containing high hard crude protein. The acid in the hydrolyzate can be neutralized with calcium oxide to slightly acidic (pH = 2-4). The filtered filtrate is diluted as organic liquid fertilizer applied foliar crop, and the remaining residue can also be used as solid fertilizer for sulfur-deficiency soil.