Purpose To gain knowledge of the effect of coal powder application on controlling phosphorus loss through runoff caused by manure application, and to provide scientific basis and technical reference for the research and development of technology applicable to small farmers to control agricultural non-point source pollution.
Method Farmland runoff simulation experiment was carried out under natural rainfall regime and three treatments were designed, that was non-fertilizer, pig manure only, pig manure plus pulverized coal. During the culture, the volume, concentrations and loss load of phosphorus in various forms of runoff were tested to study effects of pig manure application mixed with pulverized coal on phosphorus loss through runoff and the growth of plants.
Result Compared with pig manure application only, pig manure application mixed with pulverized coal could reduce the amount of runoff produced during the rainfall, and significantly lowered the concentration and loss load of different phosphorus species. The concentrations of total phosphorus (TP), total dissolved phosphorus (TDP), particle phosphorus (PP), dissolved inorganic phosphorus (DIP), dissolved organic phosphorus (DOP) in surface runoff were reduced by 22.54%, 16.84%, 27.84%, 22.54% and 5.10%, while loss load reduced by 26.6%, 19.6%, 32.0%, 23.2% and 14.5%. The addition of pulverized coal had a negative effect on the growth of pakchoi of the first two crops, but a better promotion effect was observed starting from the third crops.
Conclusion The addition of pulverized coal could effectively reduce the risk of phosphorus loss through runoff caused by pig manure application in farmland, which yet may produce a bad effect on the plant growth during a time.
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