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Which tillage system leaves 15-30% residue cover on the soil surface?

Which tillage system leaves 15-30% residue cover on the soil surface? Correct Answer Reduced till.

tillage systems that leaves less than 30% crop residue after planting are not considered as conservation tillage (Examples of Conservation tillage: Mulch-till, Ridge-till, no-till) .Reduced till systems leaves 15-30% residue cover after planting or 560 to 1120 kg per ha of small grain residues equivalent throughout the critical wind erosion period. Conventional-till systems leaves less than 15% residue cover after planting, or less than 560 kg per ha of small grain residue equivalent throughout the critical wind erosion period. E.g.: Plowing. 

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