Abstract
This study was conducted to predict the yield response of red pepper and to determine the economic weed threshold levels for red pepper cultivation field from competition with the most serious weeds, Amaranthus patulus and Digitaria ciliaris in Youngyang of Korea. Crop yield as a function of weed density was predicted by using a rectangular hyperbola, and their economic threshold levels were determined by using the equation developed by (1987). The red pepper yield loss models of weeds were predicted as y=304.7/(1+0.063x), R 2 =0.967 in D. ciliaris and y=281.3/(1+0.1723x), R 2 =0.952 in A. patulus. Economic thresholds calculated using Cousens equation were negatively related with the competitiveness of weed. Economic thresholds of each weed were calculated as 18.2 plant 100m -2 in D ciliaris, and 7.2 plant 100 m -2 in A. patulus.
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