Effect of Sterilization Methods on Soil Nutrients of Red Soil Paddy and Rice Growth

In order to explore the sterilization ways for the influence of soil nutrient and rice growth, different sterilization methods of moist heat, chloroform fumigation and ⁶⁰Co gamma ray were used with non-sterilization treatment as control to study the effect of sterilization methods on the sterilization effect and nutrients, and rice as experiment material, studied the effect of sterilization methods on rice growth. The results showed that the optimal dose of irradiation method for sterilization effect is 15 kGy, and the other three kinds of sterilization achieved 100% in sterilization rate, The sterilization significantly reduced the total nitrogen, available nitrogen and pH in the soil, meanwhile, and significantly improved the available phosphorus and organic matter content in soil with no significant effect on soil available K content, The chloroform fumigation obviously improved the content of soil organic matter and available potassium, significantly reduced the total nitrogen, available nitrogen, available phosphorus content and pH value in soil. The irradiated sterilization significantly increased the content of soil available phosphorus and available potassium, and significantly reduced the content of total nitrogen, available nitrogen and available phosphorus in soil which has no significant influence on soil organic matter and pH value. Red paddy soil is the complex high buffer environment, and different sterilization methods will have different effect on the soil corresponding sterilization effect. The three sterilization methods all significantly increased the rice plant height. The fresh weight of seeding, the fresh weight of root and the total fresh weight of rice were all significantly increased by the two sterilization methods except sterilization. The finding of this experiment could provide the foundation for choosing the mode of sterilization. with minimum interference for different test purpose. (authors)