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Black polyethylene mulch and weed control strategies were evaluated for potential use by small acreage herb producers. In both 1988 and 1989, the mulch greatly increased fresh and dry weight yields of basil  (Ocimum basilicum  L.) and rosemary  (Rosmarinus officinalis  L.). Parsley  (Petroselinum crispum  Nym.) yield did not respond to the mulch. Preplant application of napropamide provided weed control for 2 weeks, but was subsequently not effective on a heavy infestation of purslane  (Portulaca oleracea  L.). Hand-hoed and glyphosate-treated plots (both with and without plastic) produced equivalent yields. Chemical names used:  N, N  -diethyl-2(1-napthalenoxy)-propanamide (napropamide);  N-  (phosphonomethyl) glycine (glyphosate).

The Effects of Black Plastic Mulch and Weed Control Strategies on Herb Yield