A high C:N ratio containing organic CGP057148B residue slows the rate of residue breakdown because lignin content was higher than other easily decomposable compounds. The rate of decomposition of organic materials composition is in the following order sugars, starches, and proteins > hemicelluloses > cellulose > fats, waxes > lignin. On the other hand, it is especially important where the C:N ratio of organic material is high and thus, decomposition is slowed by a lack of nitrogen. In this regard, decomposition constant rate of rice straw was the lowest among the tested organic materials. This delay may help to reduce nutrient loss and better synchronize nutrient availability and crop demand [15]. Secondly, good aeration is an important factor for the proper activity of microorganisms involved in the decomposition of organic matter.

Under anaerobic conditions fungi and actinomycetes are almost suppressed and only a few bacteria take part in anaerobic decomposition. The rate of decomposition is markedly retarded in anaerobic condition. Some researchers claimed that aerobic condition 65 percent of the total organic matter decomposes during six months, while under anaerobic conditions only 47 percent organic matter can be decomposed during the same period. Thirdly, decomposition constant depends on the content of labile and nonlabile C. In this regard, cow dung and poultry litter produced 0.005 and 0.008gd?1 C, respectively. Cow dung produced the lowest CO2-C due to nonlabile carbon and sequestrated maximum organic carbon in soil. The highest CO2-C was produced in poultry litter treated pots.

Poultry litter is a fine material that is why microorganisms decompose it easily. On the other hand, control treatment produced the highest k value. From this result, it may be concluded that arable land without vegetation or Brefeldin_A crops increased CO2-C emission through oxidation process for enhancing environmental pollution. Based on these discussions, organic residues along with flooding condition improved soil organic carbon, and reduced environmental pollution.Interaction results revealed that mixing of organic residues with soil and different levels of water significantly affected rates and cumulative CO2-C emission, apparent carbon balance, uncounted carbon and decomposition constant rate of organic residues (Tables (Tables22 and and3).3). MC �� soil increased 13% emission carbon over MC �� soil. FC �� soil + poultry litter treated pot produced 100% more CO2-C over FC �� Soil. Organic residues in combination with water level produced the maximum CO2-C rate and cumulative CO2-C over soil alone with water level. Maximum residue organic carbon content (1.11g) was observed in FC �� soil + rice straw and FC �� soil + cow dung treated pot.