Weed Competition in Transplanted Sweet Peppers

Two field experiments were conducted in 1983-84 at the Fortuna Research and Development Center, Puerto Rico, to determine the economic threshold of pigweed (Amaranthus dubius), jungle rice (Echinochloa colonum) and horse purslane (Trianthema portulacastrum) and their critical period of competition in drip irrigated peppers (Capsicum annuum L. var. Cubanelle). Pepper seedlings were 42 days old at transplanting. In the economic threshold study, weed populations were adjusted to 0, 2, 5, 10, 20, 40, 80 or 120 plants/m2. In the critical period study, weeds were allowed to grow for 0, 12, 24, 36, 48 or 60 days after transplanting and were kept free until harvest. The economic threshold was found to be 2 to 5 plants/m2 for pigweed; 5 to 10 plants/m2 for jungle rice; and 20 plants/m2 for horse purslane. The critical period of weed competition ranged from 24 to 36 days.

Issue Date:
Oct 21 1984
Publication Type:
Conference Paper/ Presentation
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 Record created 2017-08-09, last modified 2020-10-28

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