Summary
This field study evaluated multiple biological indicators to detect soil quality changes in response to winter cover cropping versus fallow management across commercial and research sites in western Oregon. Over 2 years, microbial biomass carbon and β-glucosidase enzyme activity proved significantly more responsive to cover crop treatment than chemical properties such as total organic carbon or extractable nutrients, suggesting biological measures are superior early indicators of soil management effects. Cotton strip decomposition, despite its practical simplicity, was relatively insensitive to field treatments.
Regional applicability
The study was conducted in western Oregon, not the United Kingdom, limiting direct applicability to UK conditions. However, the methodological framework for identifying responsive biological soil indicators has international relevance, and UK farmers and researchers managing vegetable rotations with cover crops could potentially adapt these indicator frameworks, though local validation would be necessary given differences in soil types, climate, and farming contexts.
Key measures
Microbial biomass carbon (MBC), mineralizable N, soil enzyme activity (arylsulfatase and β-glucosidase), cotton strip decomposition (tensile strength and weight loss), CO2 respiration, total soil carbon, and extractable nutrients
Outcomes reported
The study evaluated multiple soil biological indicators (microbial biomass carbon, soil enzyme activity, cotton strip decomposition, and mineralizable nitrogen) to detect changes in soil quality in response to winter cover crop versus fallow treatments over a 2-year period. Microbial biomass carbon and β-glucosidase activity emerged as the most responsive and least variable indicators of management-induced soil quality changes.
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