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<p>Saltwater intrusion is a serious issue to the agriculture in Tran De district, Soc Trang province, Vietnam, by reducing soil nutrient availability and crop yield. Hence, finding a promising biofertilizer candidate to remediate salinized soil and improve crop yield is an essential strategy for sustainable agriculture. Therefore, a field trial was conducted to evaluate the efficacy of nitrogen-fixing purple non-sulfur bacteria (PNSB) on improving soil quality, N uptake, growth, and rice yield in saline soil in Tran De-Soc Trang. A field experiment was conducted using a randomized complete block design with four treatments: (i) full recommended fertilization (FRF), (ii) 75% nitrogen plus a mixed inoculant of <i>Rhodobacter sphaeroides</i> S01 and S06 (M-PNSB), (iii) 50% nitrogen plus M-PNSB, and (iv) farmer’s fertilization formula (FFF). Application of M-PNSB increased soil pH and ammonium content while reducing electrical conductivity and sodium concentration. Consequently, nitrogen uptake increased, sodium uptake decreased, and rice plants exhibited lower proline accumulation, indicating reduced salt stress. Plant height, panicle number, and grain filling rate improved, leading to 5.26–5.45% higher yield compared with the FRF and FFF treatments. The results demonstrate that the M-PNSB biofertilizer can mitigate salinity stress and enhance rice productivity while reducing nitrogen fertilizer demand. Further studies should explore the underlying biochemical and molecular mechanisms to optimize large-scale application in saline paddy fields.</p>

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Effects of Rhodobacter sphaeroides on nitrogen uptake, growth, and yield of rice in saline soil

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Nguyen Hoang Anh,
  • Nguyen Duc Trong,
  • Le Thi My Thu,
  • Tran Trong Khoi Nguyen,
  • Ngo Ly Cam Tu,
  • Le Thanh Quang,
  • Do Thi Xuan,
  • Nguyen Quoc Khuong

摘要

Saltwater intrusion is a serious issue to the agriculture in Tran De district, Soc Trang province, Vietnam, by reducing soil nutrient availability and crop yield. Hence, finding a promising biofertilizer candidate to remediate salinized soil and improve crop yield is an essential strategy for sustainable agriculture. Therefore, a field trial was conducted to evaluate the efficacy of nitrogen-fixing purple non-sulfur bacteria (PNSB) on improving soil quality, N uptake, growth, and rice yield in saline soil in Tran De-Soc Trang. A field experiment was conducted using a randomized complete block design with four treatments: (i) full recommended fertilization (FRF), (ii) 75% nitrogen plus a mixed inoculant of Rhodobacter sphaeroides S01 and S06 (M-PNSB), (iii) 50% nitrogen plus M-PNSB, and (iv) farmer’s fertilization formula (FFF). Application of M-PNSB increased soil pH and ammonium content while reducing electrical conductivity and sodium concentration. Consequently, nitrogen uptake increased, sodium uptake decreased, and rice plants exhibited lower proline accumulation, indicating reduced salt stress. Plant height, panicle number, and grain filling rate improved, leading to 5.26–5.45% higher yield compared with the FRF and FFF treatments. The results demonstrate that the M-PNSB biofertilizer can mitigate salinity stress and enhance rice productivity while reducing nitrogen fertilizer demand. Further studies should explore the underlying biochemical and molecular mechanisms to optimize large-scale application in saline paddy fields.