Long-term straw mulching with nitrogen fertilization increases nutrient and microbial determinants of soil quality in a maize–wheat rotation on China's Loess Plateau

Summary

This field study from China's Loess Plateau examined how combining straw mulching with nitrogen fertilisation affects soil quality in a maize–wheat rotation over an extended period. The research integrated both chemical nutrient analyses and microbial assessments to characterise soil health outcomes. Long-term straw retention combined with strategic nitrogen application appears to enhance multiple soil quality determinants, though the magnitude and mechanisms require review of the full results.

Regional applicability

Findings from the Loess Plateau may have limited direct applicability to UK cereal systems, which differ in climate, soil type, and existing fertility status; however, the approach of combining organic residue retention with nutrient management is relevant to UK soil conservation and carbon sequestration policy. UK conditions generally support higher baseline microbial activity and organic matter, necessitating locally adapted trials.

Key measures

Soil nutrient concentrations (likely nitrogen, phosphorus, potassium), soil microbial biomass, microbial community structure, soil organic matter, soil quality indices

Outcomes reported

The study measured soil nutrient concentrations, microbial community composition, and soil quality indices under long-term straw mulching combined with nitrogen fertilisation in a maize–wheat rotation system. Outcomes included assessment of how these management practices influence both chemical and biological soil properties.

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