“non-protein nitrogen”的概念、定义、翻译、参考文献-科学参考

单词	non-protein nitrogen
释义	non-protein nitrogen Encyclopedia 农学非蛋白氮释 non-protein nitrogen; NPN非蛋白质氮粗蛋白质中除了真蛋白质外，其他游离氨基酸、肽、酰胺、生物碱、有机碱、氨、尿素、尿酸和硝酸盐等含氮化合物的统称。
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