[Effect of Nitrification Inhibitors on Soil Nitrogen Dynamics and Microbial Community Structure in Aerated Paddy...

Area of Science:

• Agricultural Science
• Soil Science
• Microbiology

Context:

• Paddy soils face nitrogen loss challenges, particularly under irrigation.
• Aerated irrigation and nitrification inhibitors are potential solutions to enhance nitrogen use efficiency.

Purpose:

• To investigate the effects of micro-nano bubble water aeration irrigation combined with nitrification inhibitors on nitrogen dynamics and soil microbial communities in paddy fields.
• To analyze the impact on soil chemical properties and bacterial community structure.

Summary:

• Micro-nano bubble aeration irrigation (MB) and MB with nitrification inhibitors (MBNI) increased soil dissolved oxygen, redox potential, pH, and ammonium-nitrogen (NH4+-N) compared to conventional flooding (CF).
• MBNI treatment increased soil pH and altered nitrogen forms (NH4+-N and NO3--N) dynamics post-fertilization.
• Both MB and MBNI treatments enhanced soil bacterial diversity and richness, increasing Proteobacteria and Nitrospirota abundance while decreasing Bacteroidota. MBNI specifically reduced bacterial diversity compared to MB.

Impact:

• Combined application of nitrification inhibitors and aerated irrigation optimizes soil nitrogen supply and inorganic nitrogen content.
• This integrated approach improves soil chemical properties and influences microbial community structure, enhancing overall soil health.
• Findings provide insights for sustainable paddy soil management and improved rice cultivation practices.