Summary
This 2023 field study, published in Agriculture, Ecosystems & Environment, investigates how sustained organic fertilization enhances sweet potato production by increasing potassium availability through expansion of soil aggregate structures. The research suggests that organic management builds soil physical properties that sequester and make accessible larger pools of potassium, with corresponding improvements in crop nutrient uptake and yield. The findings contribute to understanding of how organic farming systems improve nutrient cycling through soil structural development rather than soluble nutrient inputs alone.
UK applicability
Sweet potato cultivation is limited in the United Kingdom; however, the mechanisms identified—organic matter's role in soil aggregation and nutrient availability—are broadly applicable to UK vegetable and arable systems. The findings may inform organic management practices for potassium-demanding UK crops, though local soil types and climates would require separate validation.
Key measures
Soil aggregate size fractions, potassium stocks in aggregates, plant potassium uptake, sweet potato yield, soil physical and chemical properties over extended organic management
Outcomes reported
The study examined how long-term organic fertilization affects soil potassium stocks (particularly within soil aggregates) and its relationship to sweet potato potassium uptake and crop yield. The research measured changes in soil aggregate-associated potassium fractions and corresponding impacts on plant performance.
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