Effects of Different Biochar Additions on Soil Physicochemical Properties and Tobacco Growth,Yield,and Output Value in Chongqing Mountainous Region
[Objective]The effects of different biochar additions on the physical and chemical properties of yellow loam soil,tobacco growth,yield,and output value were analysed in the Chongqing mountainous region to provide technical support for the application of biochar in soil conservation and tobacco production.[Methods]Flue-cured tobacco K326 was used as the experimental material.In 2022-2023,a completely random design was adopted for the tobacco field,and seven treatments of biochar addition were established based on the conventional film ridge cultivation and fertilisation methods.The seven biochar treatments were as follows:zero biochar addition(CK),750(T50),1 500(T100),3 000(T200),4 500(T300),6 0 0 0(T400),and 7 500 kg/hm2(T500)of biochar.During the study period,soil physical and chemical properties,tobacco agronomic traits,ground and aboveground dry matter,and yield and output values were measured.[Results]① The application of biochar increased the soil porosity and capillary water capacity.The total porosity and capillary water capacity of soil treated with T400 and T500 were significantly higher than those treated with CK in the second year of the experiment.② Compared with the CK treatment,biochar addition significantly increased the contents of available nitrogen,available phosphorus,and available potassium in the 0-20 cm soil profile,and T300,T400,and T500 treatments significantly increased the organic matter content and pH value in the 0-20 cm soil profile,which could effectively alleviate soil acidification.③ Compared with the CK treatment,the T300,T400,and T500 treatments significantly promoted the growth and biomass accumulation of tobacco and significantly increased the yield and output value of tobacco leaves.Considering the input-output ratio,the T400 treatment was optimal for improving the physical and chemical properties of soil,tobacco yield,and output value.[Conclusion]Adding suitable amounts of biochar to tobacco field soil can improve the physical and chemical properties of soil,increase soil cultivability,promote the growth,development,and dry matter accumulation of tobacco plants,and increase the yield and output value of tobacco leaves.
biocharphysical and chemical properties of soilagronomic traitsyieldChongqing mountains region
万方数据
维普
