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（F U）、腐植酸尿素（H A U）、脱盐液尿素（T U）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...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（F U）、腐植酸尿素（H A U）、脱盐液尿素（T U）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。展开更多
Technologies for reducing corn leaf burn caused by foliar spray of urea-ammonium nitrate (UAN) during the early growing season are limited. A field experiment was carried out to evaluate the effects of humic acid on c...Technologies for reducing corn leaf burn caused by foliar spray of urea-ammonium nitrate (UAN) during the early growing season are limited. A field experiment was carried out to evaluate the effects of humic acid on corn leaf burn caused by foliar spray of undiluted UAN solution on corn canopy at Jackson, TN in 2018. Thirteen treatments of the mixtures of UAN and humic acid were evaluated at V6 of corn with different UAN application rates and different UAN/humic acid ratios. Leaf burn during 1 2, 3, 4, 5, 6, 7, and 14 days after UAN foliar spray significantly differed between with or without humic acid addition. The addition of humic acid to UAN significantly reduced leaf burn at each UAN application rate (15, 25, and 35 gal/acre). The reduction of leaf burn was enhanced as the humic acid/UAN ratio went up from 10% to 30%. Leaf burn due to foliar application of UAN became severer with higher UAN rates. The linear regression of leaf burn 14 days after application with humic acid/UAN ratio was highly significant and negative. However, the linear regression of leaf burn 14 days after application with the UAN application rate was highly significant and positive. In conclusion, adding humic acid to foliar-applied UAN is beneficial for reducing corn leaf burn during the early growing season.展开更多
文摘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（F U）、腐植酸尿素（H A U）、脱盐液尿素（T U）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。
文摘Technologies for reducing corn leaf burn caused by foliar spray of urea-ammonium nitrate (UAN) during the early growing season are limited. A field experiment was carried out to evaluate the effects of humic acid on corn leaf burn caused by foliar spray of undiluted UAN solution on corn canopy at Jackson, TN in 2018. Thirteen treatments of the mixtures of UAN and humic acid were evaluated at V6 of corn with different UAN application rates and different UAN/humic acid ratios. Leaf burn during 1 2, 3, 4, 5, 6, 7, and 14 days after UAN foliar spray significantly differed between with or without humic acid addition. The addition of humic acid to UAN significantly reduced leaf burn at each UAN application rate (15, 25, and 35 gal/acre). The reduction of leaf burn was enhanced as the humic acid/UAN ratio went up from 10% to 30%. Leaf burn due to foliar application of UAN became severer with higher UAN rates. The linear regression of leaf burn 14 days after application with humic acid/UAN ratio was highly significant and negative. However, the linear regression of leaf burn 14 days after application with the UAN application rate was highly significant and positive. In conclusion, adding humic acid to foliar-applied UAN is beneficial for reducing corn leaf burn during the early growing season.
