坡缕石包膜对尿素氮行为的影响

采用静态吸收和土柱淋溶试验方法,分析对比了3种不同用量坡缕石包膜尿素与普通尿素施入土壤后对尿素氮行为的影响,结果表明:在土壤中施用坡缕石包膜尿素较普通尿素减少10.38%～26.24%的氨挥发损失,减少5.88%～27.74%的氮素(NO3--N+NH4+-N)淋溶损失,20%的坡缕石包膜尿素能显著提高土柱土壤NH4+-N含量,3种坡缕石包膜尿素都能极显著提高土柱土壤NO3--N含量.坡缕石包膜后能减少尿素氨的挥发,降低NH4+-N和NO3--N的淋失,提高土壤NH4+-N和NO3--N含量,以20%的坡缕石包膜尿素的综合生态效应最好.

Effect of palygorskite coating on various forms of nitrogen urea

Static absorption and soil column leaching methods were used to study and analyze the difference of N form between from applied urea coated with three different thicknesses of palygorskite and uncoated urea. The results show that coating urea with palygorskite decreases ammonia volatilization by 10.38%~26.24% compared with uncoated urea. Coating also reduces N (NO₃^--N+N+NH₄⁺) leaching by 5.88%~27.74%. With 20% palygorskite coating treatment, urea significantly increases the NH₄⁺-N in column soil. The three different palygorskite coatings lead to a significant increase in NO₃^--N in column soil. Urea coated with palygorskite decreases ammonia volatilization and N (NO₃^--N+NH₄⁺-N) leaching, increases NH₄⁺-N and NO₃^--N in the soil. More importantly, palygorskite coating of 20% induces optimal ecological conditions.