Tillage and Crop Management Effects on Air, Water and Soil Quality in California

Summary

This paper reviews conservation tillage as a management practice adopted globally, with particular focus on California systems. It synthesises documented benefits including reduced erosion, improved water infiltration and storage, increased soil organic matter, and enhanced environmental quality, whilst discussing variable definitions and adoption rates across regions. The paper contextualises the role of conservation tillage and cover crops within production systems seeking to balance productivity with environmental stewardship.

Regional applicability

The study is grounded in California conditions and United States adoption rates (circa 20% in 2001–2002). Findings are regionally applicable to California production systems, though conservation tillage benefits (erosion reduction, improved infiltration, increased organic matter) are widely transferable to United Kingdom arable and horticulture systems, particularly given UK soil erosion and water management pressures. UK definitions and adoption thresholds may differ from the 40% reduction in equipment passes noted for California.

Key measures

Soil loss from water and wind erosion; water infiltration; soil water storage; soil organic matter; labour, fuel and equipment use; cropping intensity; soil tilth; water and air quality

Outcomes reported

The study examines documented effects of conservation tillage on soil erosion, water infiltration, soil water storage, soil organic matter, and environmental quality (water and air). It reviews conservation tillage definitions and adoption rates globally and in California, particularly including winter cover crops in low-residue tomato systems.

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