Emission of Carbon Dioxide Influenced by Different Water Levels from Soil Incubated Organic Residues

We studied the influence of different organic residues and water levels on decomposition rate and carbon sequestration in soil. Organic residues (rice straw, rice root, cow dung, and poultry litter) including control were tested under moistened and flooding systems. An experiment was laid out as a complete randomized design at 25°C for 120 days. Higher CO(2)-C (265.45 mg) emission was observed in moistened condition than in flooding condition from 7 to 120 days. Among the organic residues, poultry litter produced the highest CO(2)-C emission. Poultry litter with soil mixture increased 121% cumulative CO(2)-C compared to control. On average, about 38% of added poultry litter C was mineralized to CO(2)-C. Maximum CO(2)-C was found in 7 days after incubation and thereafter CO(2)-C emission was decreased with the increase of time. Control produced the lowest CO(2)-C (158.23 mg). Poultry litter produced maximum cumulative CO(2)-C (349.91 mg). Maximum organic carbon was obtained in cow dung which followed by other organic residues. Organic residues along with flooding condition decreased cumulative CO(2)-C, k value and increased organic C in soil. Maximum k value was found in poultry litter and control. Incorpored rice straw increased organic carbon and decreased k value (0.003 g d(−1)) in soil. In conclusion, rice straw and poultry litter were suitable for improving soil carbon.