Rice straw produced the second highest organic carbon in soil due to organic residue decomposition constant rate was lower than other organic residues because selleck Erlotinib rice straw contains high C:N ratio with high amount of nonlabile organic carbon such as lignin. Farmer’s believe that burning process of rice straw is inexpensive and effective in removing fungus, while replacing macro- and micronutrients in the soil. However, burning also increases particulate matter in the air which creates environmental pollution, thus, alternative uses are being sought. Incorporation of rice straw provides a very sustainable alternative to conventional burning practices, because it builds soil profile and adds organic matter, nutrients, and beneficial microorganisms to the soil. Rice straw incorporation into the soil at the rate of 5.

0t ha?1 did not affect early rice growth stage or rice yield [5]. Mixing of organic residues with soil significantly increased SOC levels compared to controls. Generally, rice straw contains half of carbon, which increases SOC upon mineralization. Rice straw with soil found that the SOC content was enhanced. The significant amount of SOC was obtained in rice straw treated pot [13]. This may be due to nonlabile C and flooding system for unfavorable condition for microbial decomposition. The low microbial activities at higher C:N ratio with nonlabile C content led to slow decomposition of rice straw resulting, thereby, in higher stability of organic carbon in soil.

CO2-C emission rates were higher in the first week, but after day 14, it declined and these results were more or less consistent with previous works reported that incubated maize straw with soil together with N addition and found that initially rates were higher but declined after 10 days [13]. Enhanced cumulative CO2-C production observed in poultry litter treated pot because poultry litter is a fine particle which favors bacterial activity for the decomposition. As a result, poultry litter produced the significant amount of soil AV-951 organic carbon. Poultry litter at 0, 6, and 12.7Mg ha?1 y?1 doses increased significant amounts of carbon sequestration in soil at 0�C15cm depth [14]. So, poultry litter may be a good source of organic residue instead of farmyard manure in Bangladesh in near future because poultry farms are increasing day by day. Rice root was used in this study to compare the efficiency with other organic residues for carbon sequestration in soil. Results revealed that rice root increased carbon content in soil over control. Researchers would get some ideas about the contribution of rice root for carbon sequestration in soil. Degradation constant (k) value is good indicator to select effective carbon sequesters in soil and reduce environmental pollution.