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This NSC-330507 finding may rule out negative influence of flooding condition on microbial activity due to anaerobic conditions. Researchers reported that mineralization of organic residues highly depended on water levels of soil in incubation [6]. Other researchers claimed that CO2-C evolution increased up to 60�C80% while, suppressed at 100% moisture level. As a result, flooding condition yielded more SOC than moistened condition [7].Effect of organic residues on carbon dioxide emission rate is presented (Figure 3). Carbon dioxide emission results were statistically significant at all the studied durations.Figure 3Rate of decomposition from different organic residues.Organic residue with mixture of soil was significantly increased carbon dioxide emission over soil alone.

Poultry litter produced the highest CO2-C evolution from 7 to 120 days after incubation. The second highest CO2-C emission was obtained from soil + rice root treated pot. Control treatment performed the lowest CO2-C emission during entire period of incubation study. Maximum carbon dioxide emission (0.042mg d?1g?1 soil) was found in poultry litter mixed with soil at 14 days after incubation, and the lowest carbon dioxide emission (0.017mg d?1g?1 soil) was found in only soil treated pot. Carbon dioxide emission was decreased with the increase of time. The lowest carbon dioxide emission was found in 120 days after incubation for all the organic residues including control. Similar trend was found in cumulative carbon dioxide emission from different organic residues (Figure 5).Figure 5Cumulative CO2-C evolution from different organic residues.

Cumulative CO2-C evolution was increased with the increase of time. Mixing of organic residues with soil significantly increased cumulative CO2-C. It brought roughly a 121% increase in cumulative CO2-C production in poultry litter treated pot compared to control. All the studied organic residues, the cumulative CO2-C showed linear trend with significant variation during entire incubation period. In this study, on average about 38% C was mineralized to CO2-C in poultry litter treated pots. The percent of carbon mineralized 39.21, 77.13, 42.14, and 114.82 from rice straw, rice root, cow dung, and poultry litter, respectively, over control. The cumulative CO2-C emission was 1.39, 1.77, 1.27, and 2.21 times higher in rice straw, rice root, cow dung, and poultry litter, respectively, over control.

The CO2-C emission trend increased in the order poultry litter > rice root > rice straw > cow dung. The lowest cumulative CO2-C evolution was found in 7 days after incubation, and the maximum CO2-C evolution was obtained from 120 days after incubation. Total input and output carbon, uncounted carbon Brefeldin_A and carbon degradation constant rate results are presented (Table 3).

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