Decomposition of 14-C labeled rice straw in three submerged soils under controlled laboratory conditions
1988
Capistrano, R.F.
Results showed that the pattern of gas production over time is characterized by either an immediate or delayed peak of evolution followed by a second peak which was observed even under sterile condition. The order of 14-C labeled rice straw decomposition in San ManuelMaahasLuisiana. Among the five experimental conditions performed, the order of total gas evolution is, 120% moisture content + air 60% moisture content + airsubmerged + N2 gas submerged + N2 gas + N-P-K submerged and sterilized + air. Drying produced significant amount of gases evolved. Carbon dioxide constitutes the greatest proportion of the total gases evolved compared to methane. The second peak of gas evolution over time was observed to be caused solely by CO2. After the first peak, the amount of CH4 declined assymptotically. Addition of fertilizer under submerged and strict anaerobic atmosphere may have enhanced or trigerred the second peak of CO2 production, but this may also be attributed to intermolecular rearrangement and hydrolysis which release CO2 as in the case of submerge and sterilization experiment. San Manuel soil consistently produced the greatest amount of organic acids. This is followed by Maahas and least by Luisiana. The quantity of organic acids produced is in the order butyric acidpropionic acidacetic acid. Vanillic acid was also detected, but it did not produce radioactive trace.
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