Effects of Large-Scale Composting Processes on Maturity and Humifi cation of Cattle Manure

TANI Masayuki, LI Xiangzhen, KATO Taku, MIYATAKE Fumihito, FUJITAKE Nobuhide, KOIKE Masanori

doi:10.11449/sasj.42.1_8

There are two major methods of composting: natural piling and mechanically induced mixing. Chemical properties and optical characteristics of humic substances extracted from two types of cattle manures, which had been produced by piling and mixing methods, respectively, were compared to investigate the effects of composting processes on humifi cation of cattle manure. Both cattle manures showed mostly same degree of maturity after composting, judging from C/N ratio, easily decomposable organic matter, and germination test, however, completely different degree of humifi cation. Humic acids extracted from the cattle manure composted by the piling method were classifi ed into moderately humifi ed B-type, which characterized by dark color and developed functional groups. The cattle manure composted by the mechanically mixing method contained the immature Rp-type humic acids, which characterized by lignin-like structures. Mobile humic substances extracted by water, which would affect plant growth more directly than stable humic substances extracted by NaOH solution, were also different among the composted manures. The water-extractable fulvic acids increased during the piling processes, however, decreased during the mixing processes. The differences in characteristics of humic substances in the composted cattle manure should be taken into consideration to evaluate their effects upon fi eld application.

Effects of Large-Scale Composting Processes on Maturity and Humifi cation of Cattle Manure

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