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http://dx.doi.org/10.5660/KJWS.2012.32.3.188

Modeling the Competition Effect of Sagittaria trifolia and Monochoria vaginalis Weed Density on Rice in Transplanted Rice Cultivation  

Moon, Byeong-Chul (National Academy of Agricultural Science, RDA)
Kwon, Oh-Do (Jeollanam-do Agricultural Research & Extension Services)
Cho, Seung-Hyun (Jeollabuk-do Agricultural Research & Extension Services)
Lee, Sun-Gye (Chungcheongnam-do Agricultural Research & Extension Services)
Won, Jong-Gun (Gyeongsnagbuk-do Agricultural Research & Extension Services)
Lee, In-Yong (National Academy of Agricultural Science, RDA)
Park, Jae-Eup (National Academy of Agricultural Science, RDA)
Kim, Do-Soon (Seoul National University)
Publication Information
Korean Journal of Weed Science / v.32, no.3, 2012 , pp. 188-194 More about this Journal
Abstract
Field experiments were conducted to investigate the competition relationships of main paddy weeds with transplanted rice grown in paddy conditions. Data were used to predict crop yield as a function of weed density using a rectangular hyperbola model and determine weed economic threshold (ET) levels. The rectangular hyperbola (equation 2) was fitted to rice yield to estimate weed-free rice yield ($Y_o$) and weed competitivity (${\beta}$). Its competitivity for M. vaginalis was 0.0007445, 0.0005713, 0.000988 and 0.0008846 in Daejeon, Suwon, Iksan and Naju, respectively. The competitivity at harvest represented by parameter ${\beta}$ ranged from 0.001611 in Naju to 0.002437 in Iksan for S. trifolia. The ET levels of main paddy weeds in machine transplanted rice cultivation were well estimated based on the herbicides applied and its application cost. Therefore, our results can be used to support decision-making on herbicide application for weed management in transplanted rice cultivation.
Keywords
competition; competitivity; economic threshold (ET); rice; weed density;
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