Abstract: The effects of citrus peels addition on soil physical and chemical properties and enzyme activities were explored under the condition of reductive soil disinfestation, so as to provide theoretical basis for effective utilization of abundant citrus peels resources in agricultural production. A soil culture experiment was conducted and citrus peels was selected as organic material in reductive soil disinfestation. Three citrus peels addition levels(0, 0.25%, 0.50%)were designed, and the soil mixed with citrus peels were covered with film after the water content reaches saturation. Kept it for 40 days at room temperature. The changes of soil physical and chemical properties and related enzyme activities were studied, and the correlation between soil physical and chemical properties and enzyme activities was analyzed. The results showed that compared with pre-sterilization, the contents of alkaline hydrolysable nitrogen, available phosphorus and organic matter of sterilized soil increased significantly, and the pH value increased significantly. Under the condition of RSD, the contents of alkali hydrolyzed nitrogen, available phosphorus and organic matter of soil treated with 0.25% citrus peels application were 1.10, 1.22, 1.11 times of those treated without citrus peel application respectively. In addition, soil urease and phosphatase activities were significantly enhanced compared with those before RSD. Under the condition of RSD, the urease activities of the treatment adding 0.25% citrus peels and phosphatase activities of the treatment adding 0.50% citrus peels were 1.69, 1.46 times of those without citrus peels respectively. Before RSD, urease activity was significantly negatively correlated with pH, however, after RSD, urease activity and pH changed into a positive correlation. Meanwhile, urease activity was also positively correlated with the organic matter contents of soil added citrus peels and phosphatase activity of soil added 0.50% citrus peels could significantly positively correlated with the content of available phosphorus. Therefore, adding 0.25% citrus peels could significantly improve the soil alkali hydrolyzed nitrogen and available phosphorus level, while the pH and available potassium significantly increased by adding 0.50% citrus peels could significantly increase the soil pH and enhance the soil potassium supply level, meanwhile, it promoted the accumulation of soil organic matter on some degree. It is beneficial to improve soil fertility by adding citrus peels, when soil was reductive disinfested.

Key words: Citrus peels, Reductive soil disinfestation, Soil physical and chemical properties, Enzyme activities, Correlation

CLC Number: 

• S38