Conservation Tillage

Rows within a crop field
"Any tillage and planting system that covers [an area of] soil surface with crop residue, after planting, to reduce soil erosion... Two key factors influencing crop residue are (1) the type of crop, which establishes the initial residue amount and its fragility, and (2) the type of tillage operations prior to and including planting." From: Agricultural Chemicals and Production Technology: Glossary.
Conservation Tillage

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Mulch Tillage

No Tillage and Strip Tillage

Ridge Tillage