Effects of Pig Manure Application on Farmland Soil Fertility and its Characteristic Heavy Metals
The feed, pig manure and farmland soil surrounding a large-scale pig farm in Huaiyuan County, Bengbu City, Anhui Province, were sampled and analyzed in this paper to discuss the impacts of pig manure on farmland soil fertility and the pollution risk of its characteristic heavy metals. The changes in related indexes of the farmland soil with pig manure were studied, while the farmland soil without pig manure was used as a control. The results showed that the physical and chemical properties and fertility of the soil could be improved by applying pig manure. The organic matter, electrical conductivity and pH of the soil with pig manure were significantly higher than that of the control, and the soil enzyme activities were also in-creased by pig manure application. Due to the use of additives in pig feed, the content of copper and zinc in pig manure was 1.96 times and 1.31 times that of EU organic farming standard, respectively. Therefore, the application of pig manure would significantly increase the content of copper and zinc in soil, and even make it reach the level of light pollution. Through curve regression analysis, when the application amount of pig manure is controlled below 15.58 t · hm-2, it will not cause heavy metal pollution in the soil.
pig manuresoil fertilitycharacteristic heavy metalspollution risk assessment
国家科技期刊平台
NSTL
万方数据
