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http://dx.doi.org/10.5660/KJWS.2011.31.4.348

Rice Yield Loss and Economic Threshold Levels by Densities of Scirpus planiculmis and Lindernia dubia in Wet-Seeded Rice Paddy Fields  

Kwon, Oh-Do (Jeonnam Agricultural Research and Extension Service)
An, Kyu-Nam (Jeonnam Agricultural Research and Extension Service)
Lee, Yeen (Jeonnam Agricultural Research and Extension Service)
Shin, Seo-Ho (Jeonnam Agricultural Research and Extension Service)
Park, Heung-Gyu (Jeonnam Agricultural Research and Extension Service)
Shin, Hae-Ryoung (Jeonnam Agricultural Research and Extension Service)
Moon, Byeong-Cheol (Department of Agro-Food Safety, National Academy of Agricultural Science, RDA)
Kuk, Yong-In (Department of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Publication Information
Korean Journal of Weed Science / v.31, no.4, 2011 , pp. 348-354 More about this Journal
Abstract
This study was conducted to find the levels of reduction in rice yield and to determine economic threshold levels as affected by densities of Scirpus planiculmis and Lindernia dubia in wet seeding rice cultivation. In wet seeding rice cultivation, yield of rice in densities of S. planiculmis (192 per $m^2$) and L. dubia (384 per $m^2$) was reduced by 43 and 22%, respectively. Relationship between rice yield and densities of weeds were predicted with these equations of Y=531.3kg/(1+0.003931x), $r^2$=0.964 for S. planiculmis and Y=547.0kg/(1+0.000792x), $r^2$=0.922 for L. dubia. According to Cousens' method, economic threshold densities of S. planiculmis and L. dubia were calculated by 7.2 and 34.9 per $m^2$, respectively. This result indicated that yield of rice in wet seeding rice cultivation could be reduced by over economic threshold densities of S. planiculmis and L. dubia.
Keywords
economic threshold; Lindernia dubia; Scirpus planiculmis; weed density; yield;
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