不同耕作方式改良保山植烟土壤肥力的适宜性分析OA

In order to solve the problems of soil layer thinning and fertility reduction caused by long-term single shallow rotary tillage in main tobacco-growing areas of Baoshan,Yunnan,this study investigated the impact of rotary tillage and deep tillage on soil to evaluate the feasibility of deep tillage measures in improving the fertility of tobacco growing soil in Baoshan.Four treatments were set up,including rotary tillage(20 cm)(Q),deep tillage in 2021 and rotary tillage in other two years(S1),rotary tillage in 2022 and deep tillage in other two years(SG),and three-year continuous deep ploughing treatment(SL).The effects of different tillage methods and tillage years on soil fertility of tobacco planting by characterizing soil physical structure,soil chemical composition and soil microbial composition were explored.The results showed that:(1)The S1 treatment significantly increased the total porosity of the soil layer of 0-20 cm,and significantly increased the gravel content in the soil layer of 20-40 cm.(2)Deep tillage treatments had a significant effect on the soil chemical properties of 0-20 and 20-40 cm soil layers,which showed that the soil pH of 0-20 cm soil layer was significantly increased by 0.11-0.22,and the organic matter content and total nitrogen content of S1 treatment were the highest in 0-20 cm soil layer,and the total nitrogen content was significantly increased in both 0-20 and 20-40 cm soil layer,with an increase of 10.8%and 16.5%,respectively.(3)The soil microbiological properties of the 0-20 and 20-40 cm soil layer were significantly affected by the deep tillage treatment,which showed that the microbial biomass carbon content was significantly increased by each deep tillage treatment.The activities of soil sucrase,urease and cellulase in the 0-20 and 20-40 cm soil layers under different tillage methods were the highest in the S1 treatment,which were significantly higher than those in other treatments.The comprehensive scores of principal component analysis showed that the highest scores were all S1 treatments,and the comprehensive scores of SG treatment and SL treatment in the two soil layers were negative.A single deep tillage treatment in the mountainous and hilly areas of Yunnan province could improve the soil fertility quality after a period of time,but continuous deep tillage couldn't improve the soil quality,and it was necessary to consider the input of organic materials at the same time as deep ploughing to achieve nutrient supply in the later stage.