1d50c736_ustainable_agriculture_systems__Other_Benefits_or_Issues
[Technique] Cover crops and mulches [Contribution to Weed Control] Crops such as rye or wheat sown over winter before planting a spring crop shade out weeds and have an allelopathic effect, ie they excrete chemicals which prevent weed seed germination [Other Benefits or Issues] 
Protect soil against erosion, provide habitats for benefical organisms, may have a fertilizer value if leguminous
Integrated weed management in no-till systems | Paraquat herbicide for non-selective weed control in no-till and other sustainable agriculture systems
Other Benefits or Issues