Effect of biodegradation of added corn stalk on soil microbial biomass
1991
Prapai Chairoj | Bunharn Tangcham | Wisit Cholitkul (Department of Agriculture, Bangkok (Thailand). Soil Science Div.)
Effect of biodegradation of added corn stalk on soil microbial biomass by measuring soil biomass carbon, kinds of soil microorganism and nitrogen mineralization was studied in Pak Chong soil (Oxic Paleustults; clayey, kaolinitic) mixed with corn stalk powder, corn stalk powder+N fertilizer, N fertilizer and control which were incubated at 30+-1 deg C for 0 day, 2, 4, 6, 8, 10 and 20 weeks. Easily decomposable organic carbon of corn stalk was decomposed within 2 weeks of incubation and the remaining more difficult decomposable part was decomposed thereafter. Biodegradation of corn stalk was enhanced by N-fertilizer application. Soil biomass carbon increased by corn stalk application in the following order: corn stalk, corn stalk+N fertilizerN fertilizercontrol. Larger number of aerobic bacteria than actinomycetes and fungi was also observed. N-fertilizer application increased efficiency of corn stalk application in increasing soil microbial biomass. In addition, negative effect of nitrogen mineralization was observed by corn stalk application during rapid biodegradation of corn stalk.
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