Weed Population Distribution and Change of Dominant Weed Species in Paddy Field of Gyeonggi Region
2007
Park, J.S. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Kim, H.D. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea) | Han, S.W. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea) | Lee, J.H. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea) | Jang, J.H. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea)
The survey of weed occurrence in paddy field was carried out to investigate the dominance of weed species and weed occurrence on 330 fields of Gyeonggi Region in 2005. Weed occurrence examined based on weed dry weight per ㎡ decreased to 2.83g in 2005 from 3.06g in 2000, 5.95g in 1995 and 19.32g in 1991. Occurrence ratio of annual weeds to perennial weeds was changed to 45.2 : 54.8% in 2005 from 49.7 : 50.3% in 2000. The weed species observed include 3 species of grasses, 4 species of sedges, and 10 species of broadleaf and other weeds. The most dominant weed species was Eleocharis kuroguwai, followed by Echinochloa crus-galli, Sagittaria trifolia, Bidens tripartita, Monochoria vaginalis and Aeschynomene indica. Weed species that showed the similar dominance value compared to the survey performed in 2000 were E. kuroguwai and S. trifolia, but occurrence of M. vaginalis and B. tripartita increased, and occurrence of E. curs-galli decreased. Donimant weed species in normal paddy soil and wet paddy soil was E. kuroguwai, in poorly drained soil was E. crus-galli and in saline soil was S. planiculmis, In the analysis of weed occurrence by transplanting time, E. kuroguwai, S. trifolia and E. curs-galli wee the most dominant weed species at mid to late May transplanting, and E. kuroguwai, S. planiculmis and S. trifolia at early June transplanting. Herbicide application time per year did not differ from that in 2000. However the punctual application of herbicide increased to 86% from 77% in 2000.
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