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通过向普通尿素中添加风化煤粉、腐植酸钾和脱盐液,利用熔融造粒工艺制备出普通尿素(U)、风化煤尿素(FU)、腐植酸尿素(HAU)、脱盐液尿素(TU)3个增值尿素试验产品,在25℃条件下,进行土壤培养试验,研究了增值尿素的氨挥发特征及其对土壤微生物量碳、脲酶活性的影响。结果表明,与普通尿素相比,各增值尿素氨挥发累积量降低29.52%~39.78%,延迟了氨挥发的峰值;各增值尿素处理,在培养的前7天内土壤的脲酶活性降低,延缓了尿素态氮在土壤的转化速率;延缓了土壤微生物量碳峰值出现时间;风化煤和腐植酸尿素处理在整个培养期内表现处理了较好的稳定性,减少氨挥发效果明显。
By adding weathered pulverized coal, potassium humate and desalting solution to ordinary urea, ordinary urea (U), weathering coal urea (FU), humic acid urea (HAU) and desalting liquid urea (TU) Three value-added urea test products were tested under soil conditions at 25 ℃ to study the ammonia volatilization of added urea and its effect on soil microbial biomass carbon and urease activity. The results showed that compared with ordinary urea, the cumulative ammonia volatilization decreased by 29.52% -39.78%, which delayed the peak of ammonia volatilization. When urea was added, the soil urease activity was decreased and urea was delayed in the first seven days Nitrogen in the soil conversion rate; slowed the appearance of soil microbial biomass carbon peak time; weathered coal and humic acid urea treatment throughout the cultivation period to deal with a better stability, reduce ammonia volatilization effect.