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| Effects of liquid fertilizer on NH3 volatilization and N2O emissions in drip-irrigated cotton fields |
| Received:January 15, 2020 |
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| KeyWord:liquid fertilizer;drip-irrigated cotton fields;NH3 volatilization;N2O emissions;enzymatic activity;seed cotton yield |
| Author Name | Affiliation | E-mail | | WANG Fang-bin | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | LIU Kai | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | YIN Xing | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | LIAO Huan | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | SUN Jia-lin | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | MIN Wei | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | | | HOU Zhen-an | Department of Resources and Environmental Science/Key Laboratory of Oasis Ecological Agriculture of Xinjiang Corps, Shihezi University, Shihezi 832003, China | hzatyl@163.com |
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| Abstract: |
| It is of great importance for agricultural green production to study the effects of liquid fertilizer on nitrogen loss in drip irrigation cotton fields. The experiment consisted of five treatments:no nitrogen fertilizer(N0), 300 kg N·hm-2(TN300)conventional fertilizer, 240 kg N·hm-2(TN240)conventional fertilizer, 300 kg N·hm-2(LN300)liquid fertilizer, and 240 kg N·hm-2(LN240)liquid fertilizer. The results showed that application of nitrogen fertilizer significantly increased soil NH3 volatilization and N2O emissions in drip irrigation cotton fields, and the total losses of NH3 volatilization in each nitrogen treatment were 1.7~3.8 times higher than in the N0 treatment. The cumulative N2O emissions were 1.8~2.7 times higher than in the N0 treatment. The LN300 treatment reduced the NH3 volatilization loss by 42.4% and the N2O emissions by 14.1% compared to the TN300 treatment at the conventional nitrogen application level; at the same nitrogen reduction level, the LN240 treatment reduced NH3 volatilization losses and N2O emissions by 29.5% and 18.9%, respectively. With the same amount of nitrogen fertilizer input, the application of liquid fertilizer significantly reduced the contents of NO3--N and NH4+-N in the soil, and the activities of UR and denitrifying enzymes in the soil were also significantly decreased. Correlation analysis showed that the total amount of soil NH3 volatilization and N2O emissions were significantly positively correlated with 0~20 cm soil NH4+-N content, NO3--N content, UR activity, and NR activity, but not with soil nitrite reductase, hydroxylamine reductase, Ni R activity, or Hy R activity. Compared to applying nitrogen with conventional fertilizers, the seed cotton yields of the TN240, LN300, and LN240 treatments increased by 12.6%, 9.1%, and 24.5%, respectively, and seed cotton yield increased by 10.6% in the LN240 treatment compared to the TN240 treatment. In summary, the application of 240 kg·hm-2 nitrogen to liquid fertilizer can significantly reduce nitrogen losses in drip irrigation cotton fields and can increase cotton yield, making it a recommended fertilization measure. |
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