Effects of pelleting process on fertilizing values of broiler litter
2009
Suppadit, T., National Inst. of Development Administration, Bangkapi, Bangkok 10240 (Thailand). Graduate School of Social and Environmental Development
The effects of pelleting process on broiler litter properties were investigated at the Siriwan Co. Ltd's network farms, Saraburi Province, Thailand. The pelleting process decreased among-set variability in dry matter, electrical conductivity, urea N, K, Na, S, Fe, Cu and Cd contents. On the other hand, this process increased among-set variability in pH, total N, ammonium N, nitrate N and total P. N form contents including total N, ammonium N, nitrate N, organic N and urea N in the pelleted broiler litter that could be estimated accurately through the basis of dry matter content. Additionally, heavy metal (Cd, Ni, Pb and Cr) content was significantly higher in the pelleted form than in the fresh form which was consistent with a reduction in moisture content. The pelleted broiler litter was clearly preferable to the fresh broiler litter in terms of storage, handling, transport and field application. The results highlight a need to optimize the pelleting process with the objective of minimizing variability in pH, total N, ammonium N, nitrate N and total P.
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