Impacts of straw returning and N application on NH4+-N loss, microbially reducible Fe(III) and bacterial community composition in saline-alkaline paddy soils

Summary

This 2021 field study investigated how straw incorporation and nitrogen fertiliser application influence nitrogen loss, iron biogeochemistry, and soil bacterial diversity in saline-alkaline paddy soils—an important but challenging agroecosystem. The work suggests that management of organic matter input and nitrogen dosage can modulate both nutrient retention and soil microbial function, with implications for nutrient-use efficiency and soil health in alkaline rice production systems. The findings contribute to understanding how agronomic practices reshape soil microbial communities in a way that may affect nitrogen cycling and greenhouse gas emissions.

UK applicability

Direct applicability to UK farming is limited, as saline-alkaline paddy soils are not prevalent in British agriculture. However, the mechanistic insights into how organic matter incorporation and nitrogen management alter soil microbial community structure and nutrient cycling may inform research on improving nitrogen-use efficiency and reducing ammonia loss in UK arable and horticultural systems under different soil conditions.

Key measures

NH₄⁺-N loss; microbially reducible Fe(III); bacterial community composition (likely 16S rRNA gene sequencing or culture-based methods); soil chemical and physical properties under different straw and nitrogen treatments

Outcomes reported

The study examined how straw returning and nitrogen application rates affected ammonium nitrogen loss, microbially reducible iron(III) concentrations, and bacterial community structure in saline-alkaline paddy soils. As suggested by the title, the research quantified changes in soil microbial populations and nutrient cycling under these management practices.

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