Summary
Cover crops are becoming widely integrated into many farms as tools for improving sustainability. However, the decisions by growers for planting follow several objectives/criteria, many of which overlap. This review orders these sowing rationales into a practical framework for land management guidance. Prioritised by cover crop performance objectives, the optimal species and their environmental requirements are discussed. A key consideration of this review is that cover crops are used as part of a rotation strategy. Here, farmers’ primary objectives are to maintain or enhance biomass not of the cover plants themselves but for the following commercial crop. For example, a large cover crop biomass may be beneficial for reducing field-nutrient losses but are counterproductive if nutrient immo
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