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<p>The cultivation of Persian clover (<i>Trifolium resupinatum</i> L.) is an alternative to minimize the use of nitrogen (N) fertilizers in irrigated rice (<i>Oryza sativa</i> L.) and achieve economic and environmental sustainability in floodplain areas. The present study aims to evaluate the effect of chemical termination times of Persian clover on the dry matter (DM) yield of Persian clover and irrigated rice and nutrient availability in the soil solution. The experiment was conducted in a greenhouse in 2019/2020 and 2020/2021, in a completely randomized experimental design. Factor 1 consisted of Persian clover termination intervals (45, 30, 15, and 0&#xa0;days before rice sowing), factor 2 consisted of N rates (0 and 150&#xa0;kg N ha<sup>−1</sup>) supplemented with urea (46% N), and two fallow treatments without Persian clover were included for comparison. Dry matter production, nutrient concentrations in clover and rice, soil solution nutrients, dissolved organic carbon (DOC), and N-ammonium and N-nitrate were measured. Clover DM increased by 1.7% for each day that termination was delayed toward rice sowing, with the highest DM observed when clover was terminated at sowing (C0) and the lowest when terminated 45&#xa0;days before sowing (C45). DOC, N-ammonium, and N-nitrate in the soil solution were 83.2, 79.8, and 57.4% higher, respectively, in plots previously cultivated with Persian clover than in the fallow treatments. These results indicate that terminating clover at rice sowing enhances dry matter production and nutrient availability, supporting improved performance of the subsequent irrigated rice crop.</p>

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Reducing the interval between termination of a legume cover crop (Persian clover) and rice sowing increases soil mineral nitrogen and plant development

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月18日

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  • Cristiano Weinert,
  • Ezequiel Helbig Pasa,
  • Verônica Lemos Vargas,
  • Sidnei Deuner,
  • Júlia Peralta Ferreira,
  • Rogério Oliveira de Sousa,
  • Filipe Selau Carlos

摘要

The cultivation of Persian clover (Trifolium resupinatum L.) is an alternative to minimize the use of nitrogen (N) fertilizers in irrigated rice (Oryza sativa L.) and achieve economic and environmental sustainability in floodplain areas. The present study aims to evaluate the effect of chemical termination times of Persian clover on the dry matter (DM) yield of Persian clover and irrigated rice and nutrient availability in the soil solution. The experiment was conducted in a greenhouse in 2019/2020 and 2020/2021, in a completely randomized experimental design. Factor 1 consisted of Persian clover termination intervals (45, 30, 15, and 0 days before rice sowing), factor 2 consisted of N rates (0 and 150 kg N ha−1) supplemented with urea (46% N), and two fallow treatments without Persian clover were included for comparison. Dry matter production, nutrient concentrations in clover and rice, soil solution nutrients, dissolved organic carbon (DOC), and N-ammonium and N-nitrate were measured. Clover DM increased by 1.7% for each day that termination was delayed toward rice sowing, with the highest DM observed when clover was terminated at sowing (C0) and the lowest when terminated 45 days before sowing (C45). DOC, N-ammonium, and N-nitrate in the soil solution were 83.2, 79.8, and 57.4% higher, respectively, in plots previously cultivated with Persian clover than in the fallow treatments. These results indicate that terminating clover at rice sowing enhances dry matter production and nutrient availability, supporting improved performance of the subsequent irrigated rice crop.