Interactive effects of enhanced-efficiency N fertilizers and fulvic acid on ammonia volatilization and inorganic N leaching in saline soil
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View abstract on PubMed
Summary
This summary is machine-generated.Enhanced-efficiency fertilizers like controlled-release urea (CRU) and stabilized urea (SU) can reduce nitrogen losses in saline soils. Combining SU with fulvic acid (FA) shows promise for improving nitrogen management in these challenging environments.
Area Of Science
- Soil Science
- Agronomy
- Environmental Science
Background
- Saline soils suffer from poor nutrient retention, leading to significant nitrogen (N) losses via ammonia (NH3) volatilization and N leaching.
- Enhanced-efficiency fertilizers (EEFs) like controlled-release urea (CRU) and stabilized urea (SU), along with fulvic acid (FA), are known to mitigate N losses in non-saline soils.
- The combined effects of EEFs and FA on nitrogen dynamics in saline soils are not well understood.
Purpose Of The Study
- To investigate the impact of different N fertilizer types (conventional urea [CU], CRU, SU) and application strategies (full vs. basal substitution) with or without FA.
- To assess the effects on ammonia volatilization, inorganic N leaching, and plant N utilization in a coastal saline soil.
- To provide insights for optimizing nitrogen management in coastal saline agricultural systems.
Main Methods
- Field study comparing CU, CRU, and SU treatments with varying FA application rates and substitution strategies.
- Quantification of ammonia (NH3) volatilization and inorganic nitrogen (N) leaching losses.
- Measurement of plant N uptake, N use efficiency, and agronomic efficiency.
Main Results
- CRU significantly reduced NH3 emissions compared to CU, while SU (full substitution) increased volatilization, potentially due to nitrification inhibitor effects in saline conditions.
- FA application moderated NH3 volatilization effects of both CRU and SU.
- All tested amendments (CRU, SU, FA) effectively reduced inorganic N leaching, with SU showing the greatest reduction.
- CRU and SU individually improved N use and agronomic efficiencies; FA enhanced SU's efficacy but suppressed CRU's.
Conclusions
- Controlled-release urea (CRU) without FA supplementation is effective in reducing nitrogen losses in saline soils.
- Stabilized urea (SU) as a basal fertilizer combined with FA demonstrates superior performance in mitigating N losses and enhancing crop productivity.
- These findings offer valuable strategies for sustainable nitrogen management in coastal saline agricultural lands.
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