Context

The application of nitrogenous fertilizer synergist to coordinate nitrogen transformation process in soil may be an efficient strategy to increase nitrogen use efficiency and decrease environmental pollution. However, there are few reports on the application effects of UAN synergistic nitrification and urease inhibitors under the integration of water and fertilizer.

Objective

This study aimed to explore effects of urea ammonium nitrate solution (UAN) combined with urease and nitrification inhibitors on yield and nitrogen efficiency of summer maize and its ecological effects under the fertigation, and to provide scientific basis for the efficient utilization of UAN.

Methods

The experimental treatments were as follows: no inhibitor treatment (U), nitrification inhibitor treatment (U-D), urease inhibitor treatment (U-N), and the combination of nitrification and urease inhibitors treatment (U-D+N).

Results

Results showed that UAN combined with urease or nitrification inhibitors could significantly reduce the cumulative emission of N₂O, and then significantly decreased the N₂O warming potential (GWP_N2O) and N₂O greenhouse gas intensity (GHGI_N2O). Compared with U treatment, the cumulative N₂O emissions of U-D+N, U-N, and U-D treatments was reduced by 45.7 %, 25.3 % and 35.8 %, respectively. The GWP_N2O of U-D+N, U-N and U-D treatments decreased by 45.7 %, 25.3 % and 35.7 %, while GHGI_N2O decreased by 50.9 %, 30.3 % and 38.9 % on average, respectively, compared to those of U treatment. Application of urease inhibitors significantly reduced NH₃ volatilization. The cumulative NH₃ volatilization of U-N and U-D+N treatments was reduced by 30.7 % and 23.4 %, while U-D treament was significantly increased by 12.3 %, respectively, compared to that of the U treatment. In addition, UAN combined with urease or nitrification inhibitor could significantly increase the contents of NO₃^--N and NH₄^--N in the 0–20 cm soil layer, and significantly reduced the leaching of NO₃^--N to the deep soil. The total nitrogen accumulation, grain nitrogen content, nitrogen transport efficiency and post-anthesis assimilation of summer maize were significantly increased, which were beneficial to the improvement of grain yield and economic benefits.

Conclusions

under the fertigation, the synergistic application of UAN with urease and nitrification inhibitors were beneficial to reduce greenhouse gas emissions and ammonia volatilization, improved the nitrogen use efficiency, and then improved the yield and economic benefits of summer maize.

Significance

Under the fertigation, UAN combined with urease and nitrification inhibitors were beneficial to emission reduction, high yield, and high efficiency.

中文翻译：

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尿素硝酸铵溶液联合脲酶和硝化抑制剂共同减缓NH3和N2O排放，提高夏玉米灌溉施肥氮素利用效率

语境

应用氮肥增效剂协调土壤中的氮素转化过程可能是提高氮素利用效率和减少环境污染的有效策略。但关于水肥一体化下UAN协同硝化脲酶抑制剂的应用效果报道较少。

客观的

【摘要】：目的探讨尿素硝酸铵溶液(urea ammonium nitrate solution,UAN)联合脲酶和硝化抑制剂对灌溉施肥下夏玉米产量和氮素效率的影响及其生态效应,为UAN的高效利用提供科学依据。

方法

实验处理如下：无抑制剂处理（U）、硝化抑制剂处理（UD）、脲酶抑制剂处理（UN）、硝化和脲酶抑制剂联合处理（U-D+N）。

结果

结果表明，UAN与脲酶或硝化抑制剂联用可显着降低N ₂ O的累积排放量，进而显着降低N ₂ O升温潜能值（GWP _N2O）和N ₂ O温室气体强度（GHGI _N2O）。与U处理相比，U-D+N、UN和UD处理的N ₂ O累计排放量分别降低了45.7%、25.3%和35.8%。U-D+N、UN和UD处理的GWP _N2O分别下降了45.7%、25.3%和35.7%，而GHGI _N2O与 U 处理相比，平均分别降低了 50.9%、30.3% 和 38.9%。脲酶抑制剂的应用显着降低了NH ₃的挥发。与U处理相比，UN和U-D+N处理的累积NH _{3挥发减少了30.7%和23.4%，而UD处理分别显着增加了12.3%。}此外，UAN与脲酶或硝化抑制剂联用可显着提高0~20 cm土层NO ₃ ^- -N和NH ₄ ^- -N的含量，显着降低NO ₃ ^{-的淋溶。}-N 去深土。夏玉米总氮积累量、籽粒氮含量、氮素运输效率和花后同化作用显着提高，有利于提高籽粒产量和经济效益。

结论

灌溉施肥条件下，UAN与脲酶、硝化抑制剂协同施用，有利于减少温室气体排放和氨挥发，提高氮素利用效率，进而提高夏玉米产量和经济效益。

意义

灌溉施肥条件下，UAN与脲酶和硝化抑制剂结合使用，有利于减排、高产、高效。