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<p>Nitrogen (N) fertilizer management in agricultural field affects soil N budget. As N stabilizer, nitrification inhibitor (NI) and urease inhibitor (UI) were widely used to reduce N loss. In this study, a two-year field experiment was conducted to investigate the efficiency of separated and integrated use of dicyandiamide (DCD) and 3,4-dimethyl pyrazole phosphate (DMPP), as well as UI (NBPT) along with N fertilizer UAN on N loss in Louisiana subtropical cornfield (Check, UAN, UAN + DCD, UAN + DMPP, UAN + DMPP×2, UAN + NBPT, and UAN + DCD + NBPT). Specifically, N loss were determined by indicators of nitrous oxide (N<sub>2</sub>O) gas emission, corn yield, N use efficiency (NUE), and ratio of NH<sub>4</sub><sup>+</sup> to (NO<sub>3</sub><sup>−</sup> + NO<sub>2</sub><sup>−</sup>). Results show that all N stabilizers reduced the N<sub>2</sub>O comparing to UAN only, with efficiency order of DMPP×2 &gt; NBPT + DCD &gt; DCD &gt; DMPP &gt; NBPT. In addition, N<sub>2</sub>O emission showed response to N stabilizers with same the trend in morning and night but significantly (<i>p</i> &lt; 0.05) higher emission in morning than night. More, DMPP, DMPP×2, and NBPT + DCD significantly (<i>p</i> &lt; 0.05) increased NUE. Further, DMPP×2 and DCD + NBPT show significant (<i>p</i> &lt; 0.05) positive correlations with NH<sub>4</sub><sup>+</sup> while negative correlation with NO<sub>3</sub><sup>−</sup> + NO<sub>2</sub><sup>−</sup> in soil. Overall, combination applications of DCD + NBPT was suggested in Louisiana cornfield with high efficiency on reducing N loss through N<sub>2</sub>O, improving fertilizer recovery, and reducing the conversion of NH<sub>4</sub><sup>+</sup>-N to NO<sub>3</sub><sup>−</sup>/NO<sub>2</sub><sup>−</sup> -N.</p>

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Evaluation of nitrogen behavior according to combination of nitrogen stabilizers in subtropical cornfield

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Zhuo Wei,
  • Shurun Yao,
  • Jim J. Wang,
  • Scott M. Pensky,
  • Yili Meng,
  • Syam Dodla,
  • Jong-Hwan Park

摘要

Nitrogen (N) fertilizer management in agricultural field affects soil N budget. As N stabilizer, nitrification inhibitor (NI) and urease inhibitor (UI) were widely used to reduce N loss. In this study, a two-year field experiment was conducted to investigate the efficiency of separated and integrated use of dicyandiamide (DCD) and 3,4-dimethyl pyrazole phosphate (DMPP), as well as UI (NBPT) along with N fertilizer UAN on N loss in Louisiana subtropical cornfield (Check, UAN, UAN + DCD, UAN + DMPP, UAN + DMPP×2, UAN + NBPT, and UAN + DCD + NBPT). Specifically, N loss were determined by indicators of nitrous oxide (N2O) gas emission, corn yield, N use efficiency (NUE), and ratio of NH4+ to (NO3− + NO2−). Results show that all N stabilizers reduced the N2O comparing to UAN only, with efficiency order of DMPP×2 > NBPT + DCD > DCD > DMPP > NBPT. In addition, N2O emission showed response to N stabilizers with same the trend in morning and night but significantly (p < 0.05) higher emission in morning than night. More, DMPP, DMPP×2, and NBPT + DCD significantly (p < 0.05) increased NUE. Further, DMPP×2 and DCD + NBPT show significant (p < 0.05) positive correlations with NH4+ while negative correlation with NO3− + NO2− in soil. Overall, combination applications of DCD + NBPT was suggested in Louisiana cornfield with high efficiency on reducing N loss through N2O, improving fertilizer recovery, and reducing the conversion of NH4+-N to NO3−/NO2− -N.