Labeling of Poultry Manure with ^15N

概要

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The objectives of this study were to produce ^15N-labeled poultry manure compost, evaluate the uniformity of ^15N labeling of poultry manure and investigate the ^15N recovery derived from ^15N-labeled feed during the production of ^15N-labeled poultry manure compost. Eight chicken layers were fed with ^15N-labeled feed containing 2.57 atom% ^15N excess for 22 d, and then with unlabeled feed for 6 d. The feces were collected during a period of 28 d. The collected fresh feces were respectively dried, smashed, and all the collected feces were mixed thoroughly. The ^15N abundance of the prepared ^15N-labeled poultry feces (abb. PLPF) was 1.69 atom% ^15N excess. The recovery of ^15N derived from ^15N-labeled feed was 41.2% after feeding to chicken layers. The ^15N abundance in the major fractions of the PLPF separated by the method of Yonebayashi and Hattori (Soil. Sci. Plant Nutr., 26, 469-481, 1980), was not significantly different except for the amide-N fraction. Since the rate of amide-N fraction to total manure N was very low, it was considered that the PLPF obtained by this method would be suitable for studying the dynamics of manure N used as soil amendment. The recovery of ^15N derived from ^15N-labeled feed was 12.1% after composting. About 70% of total manure N was lost during composting. The major N loss from poultry manure during composting was due to ammonia volatilization.
社団法人日本土壌肥料学会の論文