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Effect of 3 Kinds of Organic Fertilizers on the Concentrations of Dissolved Organic Carbon in Clay Soil under Flooded Conditions

Using pot experiment to study the effect of three organic fertilizers of chicken manure compost (CM), activated sludge (AS) and cassava residue compost (CR) on the concentrations of dissolved organic carbon (DOC) in clay soil under flooded conditions. The results showed that the regular patterns of the concentrations of DOC are basically the same in clay soils on applying three kinds of organic fertilizers and no applying fertilizers under flooded conditions. They were all showed as a “down-up-down” trend. The three kinds of organic fertilizers could effectively increase the concentrations of DOC in clay soils. And the concentrations of DOC gradually increased with increasing of the added proportion of organic fertilizers in clay soils, which respectively increased 1.34% ~ 52.64%, 4.58% ~ 149.98% and 2.64% ~ 72.45% in the treatments on 1%~3% addition amount of CM, AS and CR. It indicated that the improving effect of three kinds of organic fertilizers on the concentrations of DOC showed as AS>CR>CM in clay soils under flooded conditions.