• Title/Summary/Keyword: 광엽잡초

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Floristic Composition and Community Dynamics Along the Nakdong River (낙동강변(洛東江邊)의 잡초식생(雜草植生)에 관(關)한 연구(硏究))

  • Kim, K.U.;Kwon, S.T.;Back, K.W.;Kim, J.H.;Kim, H.Y.
    • Korean Journal of Weed Science
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    • v.10 no.2
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    • pp.67-74
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    • 1990

  • Weed species investigated along the Nakdong River on September, 1989 were 105 species in 29 families. Vegetation analysis along the Nakdong River using a two dimensional ordination diagram showed the existence of six plant community types, namely, Humulus japonicum, Persicaria thunbergii, Artemisia capillaris, Persicaria blumei-Setaria viridis-Digitaria sanguinalis and Phragmites communis. Especially the largest community type, Phragmites communis had dominant weed species such as Humulus japonocum, Arundinella hirta, Persicaria thunbergii, Setaria viridis, Sasola collina and Persicaria perfoliata.

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Characterization of Weed Occurrence in Protected Culture(P.E. house, P.E. tunnel, P.E. mulching) (시설재배지(施設栽培地)(P.E. 하우스, P.E. 턴넬, P.E. 멀칭)에서의 잡초발생특성(雜草發生特性))

  • Woo, I.S.;Pyon, J.Y.
    • Korean Journal of Weed Science
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    • v.8 no.3
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    • pp.317-323
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    • 1988

  • This survey was conducted to know characterization of weed occurrence under protected culture conditions at Yousong in 1985. Chenopodium album, Polygonum hydropiper, Portulaca oleracea and Digitaria sanguinalis were dominated in outdoor, whereas Capsella bursa-pastoris, C. album, D. sanguinalis and P. oleracea were dominant in polyethylene house. More weeds emerged in mulching plots and dry weight of weeds was greater in non-mulching plots. Summer broadleaf weeds and summer grasses were abundant in outdoor, whereas non-mulching plots in polyethylene house was dominated by winter broadleaf weeds, and mulching plots in polyethylene house were dominated by winter grasses and winter broadleaf weeds in early stage and summer grasses and summer broadleaf weeds in late stage. Simpson index was high in polyethylene house and Shannon's diversity index, maximum diversity for the Shannon diversity index were lower than eveness using the Shannon diversity index and this trend was more remarkable in mulching and mulching in tunnel than in non-mulching under polyethylene house condition. Shannon diversity index, maximum diversity for the Shannon diversity index were high in mulching or tunnel, and Simpson index was high in non-mulching in outdoor condition. Interspecific competition was more severe than intraspecific competition in both conditions.

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Statuses and Perspectives of Herbicides Development Against Herbicide-Resistant Weeds in Paddy Field of Korea (논 제초제 저항성 잡초 발생에 따른 제초제 개발 현황과 방향)

  • Park, Tae-Seon
    • The Korean Journal of Pesticide Science
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    • v.12 no.1
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    • pp.1-8
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    • 2008

  • The widespread and diverse sulfonylurea (SU) resistance problem has found in Korea, where one-shot-treatment herbicides such as pylazosulfuron/molinate and bensulfuron/molinate have been used continuously since 1989. The SU-resistant weeds of 7 annual weeds and 3 perennial weeds as of 2008 have confirmed in paddy fields in Korea. An effective management to SU-resistant weeds requires an integrated approach toward the weed control system, in particular, as to the drastic changes of herbicides development. Recent trend of new paddy herbicides in Japan has been developing to maximize the management of SU-resistant weeds. In the future, it is expected that the development of paddy herbicides in Korea is likely to be shifted toward the new "one-shot-treatment" included with herbicides of over 3-ways to maximize the control of resistant weeds. Bromobutide and carfentrazone are effective against sedges and broad-leaved weeds, respectively, and benzobicyclone and pyrimisulfam are effective against sedges and broad-leaved weeds.

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Weed Flora Changes in Lowland Rice Field in Gangweon Province (강원지역(江原地域) 지대별(地帶別) 논잡초(雜草) 분포(分布))

  • Kim, K.S.;Kim, J.R.;Ko, J.H.;Sa, J.G.;Chang, J.S.;Kim, D.Y.
    • Korean Journal of Weed Science
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    • v.14 no.4
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    • pp.258-264
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    • 1994

  • The weed survey in lowland rice field in 1992 was conducted to identify weed population change as affected by different elevation, soil type and cultivation pattern at Gangweon province. There were more perennial weeds in plain and east coastal area while more annual weeds in mid alpine and alpine area. Meanwhile, perennial weed species was more dominant at ordinary and sandy soil but annual weed species was more dominant at poorly drained soil. In general, hand and machine(30 day old seedling) transplanting would result in higher dominant weed species of perennial while there was more annual weed species in machine (10 day old seedling) transplanting and dry seeding, respectively. Also, annual weed species was more predominant at spring plowing time compared to autumn plowing time. Particularly, there was change in dominant weed species with time. In 1971 annual weed species was more predominant but perennial weed species was highly dominant in 1981 and 1992.

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Herbicidal Effects and Crop Selectivity of Sorgoleone, a Sorghum Root Exudate under Greenhouse and Field Conditions (온실과 포장조건에서 수수 추출물 Sorgoleone의 제초활성 및 작물 선택성)

  • Uddin, Md. Romij;Won, Ok-Jae;Pyon, Jong-Yeong
    • Korean Journal of Weed Science
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    • v.30 no.4
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    • pp.412-420
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    • 2010

  • Weeds are known to cause enormous losses due to their interference in agro ecosystems. Because of environmental and human health concerns, worldwide efforts are being made to reduce the heavy reliance on synthetic herbicides that are used to control weeds. In this regard phytotoxicity of allelochemical sorgoleone, which is a major component of the hydrophobic root exudates of Sorghum bicolor was evaluated in different weed species and also its crop selectivity in greenhouse and field conditions. Sorgoleone strongly inhibited the growth of different weeds by pre-emergence and post-emergence applications both in greenhouse and field conditions. Post-emergence application of sorgoleone on 21-day-old weed seedlings had a greater inhibitory effect than the pre-emergence application. Again, broadleaf weed species were more susceptible than grass species to the application of sorgoleone at both stages of growth. Growth of broadleaf weed species was suppressed by greater than 80% for most of the weed species except a few species and among them the species Rumex japonicus and Galium spurium were completely suppressed at $200{\mu}g\;ml^{-1}$ sorgoleone. Like greenhouse trial, sorgoleone was more effective for broadleaf weed species followed by sedge and grass weed species in the field condition. The growth inhibition of weeds was slightly lower in field condition compared to greenhouse condition. The crop species like rice, barley, wheat, corn, perilla, tomato, soybean and Chinese cabbage were tolerant to sorgoleone while lettuce and cucumber were slightly susceptible to sorgoleone. Consequently, sorgoleone may be applied to control weeds in organic farms without affecting the growth of crop.

  • https://doi.org/10.5660/KJWS.2010.30.4.412 인용 PDF KSCI