| the effects of cover crop on weed control in collard (brassica olerecea var acephala) and lettuce (lactuca sativa l.). | leafy vegetables are not very competitive and weed interference can cause considerable yield losses in collard (brassica olerecea var acephala) and lettuce (lactuca sativa l.). currently there are no pre or post emergence herbicides registered for weed control in these vegetables in turkey. for this reason, alternative weed control strategies need to be developed. cover crop residue could represent an alternative method of weed management in these crops. field studies were conducted in 2004 at t ... | 2006 | 17390812 |