Organic matter evolution and microbial activity in a vineyard soil after four years of inter-row cover crop management

Summary

This four-year field study in central Italy examined how two inter-row vineyard management strategies—annual Egyptian clover cover crop and permanent spontaneous meadow—affected soil organic matter dynamics and microbial function compared to long-term uncultivated control soil. The annual legume cover crop produced significantly higher topsoil humic acid content (indicating stabilised organic carbon) and elevated microbial biomass and respiration, whilst the permanent meadow accumulated greater total organic carbon. Both management approaches enhanced enzyme activities related to carbon and nitrogen cycling, suggesting that even short-term (4-year) cover cropping can improve soil biological function in vineyards.

UK applicability

Findings may have limited direct applicability to UK viticulture given differences in climate, soil type, and the suitability of Egyptian clover to UK conditions; however, the study's demonstration that legume-based inter-row management can build stable soil organic matter and enhance microbial activity is relevant to UK vineyard operators and soil health practitioners exploring conservation agriculture approaches.

Key measures

Total and extractable organic carbon; humic and fulvic acids; microbial biomass carbon; soil respiration; β-glucosidase activity; nitrogen-cycling enzyme activity; phosphatase activity; measurements at 0–20 cm and 20–40 cm soil depths

Outcomes reported

The study measured soil organic carbon fractions (total, extractable, humic and fulvic acids), microbial biomass carbon, soil respiration, and enzyme activities (β-glucosidase, nitrogen-cycling enzymes, phosphatase) across two soil depths over four years of cover crop management. Results indicated that inter-row cover cropping strategies increased topsoil organic carbon content and altered microbial activity relative to uncultivated control soil.

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