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<p>Urease inhibitors such as <i>N</i>-(<i>n</i>-butyl) thiophosphoric triamide (NBPT) reduce ammonia volatilization from urea, though their effects on crop yield remain variable. Micronutrients such as boron (B), zinc (Zn), nickel (Ni), and molybdenum (Mo) can inhibit urease while serving as plant nutrients, which potentially increase crop yield. Our goal was to investigate under field conditions, the potential of urea coated with B, Zn, Ni, or Mo, combined or not with NBPT, in improving the nutritional status, grain yield, and N recovery of maize&#xa0;(<i>Zea mays</i> L.). Two experiments were carried out, one in clayey soil and another in sandy soil, with <sup>15</sup>N-labeled urea used in selected treatments. Foliar Zn and Ni were not altered, whereas B and Mo contents increased with respective coatings. In sandy soil, all N fertilizers increased the foliar N contents, a result that did not occur in clayey soil. In clayey soil, under Ur-NBPT, N recovery efficiency by plants was improved by 59%, resulting in higher yield than other N sources. In contrast, no recovery differences were observed in sandy soil. Overall, Ur + B and Ur-NBPT + B provided the highest yield increases in maize, attributed to the low B content in sandy soil and the increased B content in leaves. Most N uptake was soil-derived, accounting for 59% in the clayey soil and 67% in the sandy soil. Coating urea with the specific limiting micronutrient (B) was effective in enhancing maize yield in sandy soil, where N was not the only limiting factor due to low B availability.</p>

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Field evaluation of coated urea with NBPT and micronutrients: 15N recovery and maize yield in contrasting soils

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Bruno Maia Abdo Rahmen Cassim,
  • Eduardo Mariano,
  • Izaias Pinheiro Lisboa,
  • Clelber Vieira Prestes,
  • Celso Rafael Macon,
  • Lucas Hiroshi Suguiura,
  • Marcelo Augusto Batista,
  • Rafael Otto

摘要

Urease inhibitors such as N-(n-butyl) thiophosphoric triamide (NBPT) reduce ammonia volatilization from urea, though their effects on crop yield remain variable. Micronutrients such as boron (B), zinc (Zn), nickel (Ni), and molybdenum (Mo) can inhibit urease while serving as plant nutrients, which potentially increase crop yield. Our goal was to investigate under field conditions, the potential of urea coated with B, Zn, Ni, or Mo, combined or not with NBPT, in improving the nutritional status, grain yield, and N recovery of maize (Zea mays L.). Two experiments were carried out, one in clayey soil and another in sandy soil, with 15N-labeled urea used in selected treatments. Foliar Zn and Ni were not altered, whereas B and Mo contents increased with respective coatings. In sandy soil, all N fertilizers increased the foliar N contents, a result that did not occur in clayey soil. In clayey soil, under Ur-NBPT, N recovery efficiency by plants was improved by 59%, resulting in higher yield than other N sources. In contrast, no recovery differences were observed in sandy soil. Overall, Ur + B and Ur-NBPT + B provided the highest yield increases in maize, attributed to the low B content in sandy soil and the increased B content in leaves. Most N uptake was soil-derived, accounting for 59% in the clayey soil and 67% in the sandy soil. Coating urea with the specific limiting micronutrient (B) was effective in enhancing maize yield in sandy soil, where N was not the only limiting factor due to low B availability.