Abstract: The effects of adding additives of urea and alfalfa on Allation (All) during manure composting were studied. The results showed, adding additives could raise All contents significantly, ranging from 10.5%~22.5%, and slow down the decline of All contents in later composting stage. The changes of protein and nucleic acid affect All accumulation. Pathway analysis showed that the direct action of protein was great, Its direct action coefficient was over 0. 9, while that of nucleic acid was slight, its direct action coefficient was below 0. 05. Indirect action of protein and nucleic acid was little. The main role of additives raising All content is due to improving the microorganism activities and promoting All biosynthesis.

Key words: Manure composting, Allation, Urea, Alfalfa