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Agriculture

Enhancing Soil-Plant Nitrogen Pool in Paddies Systems Can Mitigate Environmental Pollution

Strategic Insights

— 1 min read

Research from Sichuan Agricultural University reveals that a larger soil-plant nitrogen pool (SPNP) in paddies systems may not inherently improve nitrogen use efficiency (NUE), but can be significantly enhanced through strategic fertilizer practices. By employing the DeNitrification-DeComposition model, researchers evaluated fertilizer practices including single chemical N (SCN), SCN combining with green manure (GM), straw incorporation (SI) or manure fertilizer (MF), with the aim of achieving high NUE under elevated SPNP conditions. Results indicated that combining green manure with SCN at 50-100 kg N ha-1 (GMN50-100) significantly enhanced NUE under elevated SPNP conditions.

Key Takeaways:

  • The DeNitrification-DeComposition model was employed to evaluate fertilizer practices and their impact on nitrogen use efficiency (NUE) in paddies systems.
  • Combining green manure with single chemical N (SCN) at 50-100 kg N ha-1 (GMN50-100) significantly enhanced nitrogen use efficiency (NUE) under elevated SPNP conditions.
  • This practice increased soil organic N by 67% and soil microbial N fixation by 5%, while reducing NH3 volatilization by 20-30 kg N ha-1.
  • The GMN50-100 strategy resulted in superior nitrogen use efficiency compared to other tested practices, including straw incorporation (SI) and manure fertilizer (MF) combined with SCN (SIN and MFN, respectively).
  • The study concluded that the GMN50-100 approach is the most effective strategy for sustaining high nitrogen use efficiency under high SPNP conditions.

Statistics:

  • 67% increase in soil organic N through combining GM with SCN at 50-100 kg N ha-1 (GMN50-100).
  • 5% increase in soil microbial N fixation through GMN50-100.
  • 20-30 kg N ha-1 reduction in NH3 volatilization through GMN50-100.
  • 22% increase in soil organic N through SIN.
  • 20% increase in soil organic N through MFN.

Sources:

  • Nitrogen use efficiency in high soil-plant nitrogen pool: Fertilizer management optimization via the DNDC model in rice fields. Journal of Agriculture and Food Research, 2025, 22():102108.
  • Sichuan Agricultural University.
  • Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611380, People's Republic of China.

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