Effects of Co-application of Tobacco Stalk Biochar and Urea on the Physicochemical Properties of Acidic Red Soil and Crop Growth
In order to investigate the effects of co-application of biochar and urea on crop growth,2％of tobacco stalk biochar was added to acidic red soil.Urea was added at 20,40 mg·kg-1,and 60 mg·kg-1(calculated by N,labeled as T1,T2,and T3),with no addition as the control(CK).Brassica rapa var.chinensis,a widely con-sumed vegetable,was selected as the experimental crop.After 80 days of growth,the crops were harvested,and soil samples were collected for analysis of physicochemical properties and urease activity.The results showed that the crop yield significantly increased with the increasing of N application amount(P＜0.05).Compared with CK,the crop yield under T1,T2,and T3 treatments increased by 53％,75％,and 103％,respectively.Mo-reover,the content of available nitrogen in the soil and electrical conductivity were significantly increased,while pH was decreased under urea application(P＜0.05).Multiple regression analysis indicated that the content of available nitrogen in the soil was the key factor affecting crop yield(R2=51.1％),and the nitrogen content in the plant leaves was increased under urea application(P＜0.05).Therefore,the addition of nitrogen to biochar-amended acid red soil is an effective measure to promote crop growth and yield.
Tobacco stalk biocharAmmonium nitrogenNitrate nitrogenCrop yieldAcid red soil
万方数据
维普
