• Title/Summary/Keyword: rice weed

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Ecology and Growth of Weeds and Weedy Rice in Direct-seeded Rice Fields (직파재배답(直播栽培沓)에서의 잡초(雜草) 및 적미(赤米) 발생(發生) 생태(生態))

  • Choi, C.D.;Moon, B.C.;Kim, S.C.;Oh, Y.J.
    • Korean Journal of Weed Science
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    • v.15 no.1
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    • pp.39-45
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    • 1995
  • This experiment was carried out at Yeongnam Crop Experiment Station since 1992 to obtain basic information on ecology of weeds and weedy rice in direct-seeded rice fields. Annual grass weeds of Echinochloa sp., Leptochloa sp., Digitaria sp. and Setaria sp.(C4 plant) and weedy rice(C3 plant) were important species in direct seeded rice compared to transplanted rice field. Period of seedling emergence of barnyard grass was varied from 8 days to 20 days depending on seeding date while it was shorter 4 to 6 days than rice. Weed occurrence and the degree of yield loss were varied by cultivation method. In direct seeding method weeds increased 2 to 3 times compared to manual transplanting. The greatest yield loss was recorded in direct seeding(40 to 100%) followed by mechanical transplanting(25 to 35%) and hand transplanting(10 to 20%), in order. Double cropping of rice-barley was reduced weeds about 30% than rice single crop due to alleopathic effect of barley residue or stubble. Weedy rice(red rice) occurrence was closely related with seeding date and tillage methods. Early seeding and reduced tillage enhanced the growth of weedy rice.

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Effect of Molinate Granular Formulations on Weed Control Efficacy and Growth of Rice Plants (Molinate 혼합입제(混合粒劑)의 제형별(劑型別) 살초효과(殺草效果) 및 벼의 생장(生長)에 미치는 영향(影響))

  • Pyon, J.Y.;Kim, M.H.;Oak, H.S.;Park, S.H.
    • Korean Journal of Weed Science
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    • v.7 no.3
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    • pp.316-320
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    • 1987
  • In order to determine effects of molinate mixture granular formulations on release rate and weed control efficacy of herbicides and growth of rice plants, zeolite impregnation, slurry, and sand-coating granules were tested in laboratory and greenhouse. Release rate of molinate and simetryn was faster in sand-coating granule than in zeolite impregnation and slurry type granules. Mixture granular formulations of molinate/simetryn or molinate/simetryn/MCPB showed good weed control efficacy and this trend was more remarkably shown in sand-coating granule. Sand-coating granule more inhibited growth of rice plants compared to zeolite impregnation and slurry type granules.

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Development of Weed Control System in Rice (수도작 잡초방제체계의 전망)

  • Su-Bong Ahn
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.23 no.3
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    • pp.47-54
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    • 1978
  • Weed control is an essential part in rice culture and has been practiced by hand. But the shortage of man power in rural area in recent years has brought about the use of herbicides. The effective use of herbicides in rice has contributed toward improving labor situation and maintaining rice production. The use of herbicides will extend more in the future. The only limitation of present uses of monoherbicides might be the predominant growth of a certain weeds in paddy field, and subsequent effect on ecology system. It is, therefore, wanted to develop a herbicide which will be effective on several kinds of weeds. In the weed control system, ecological and integrated weed control would be necessary in the future. To obtain the most effective weed control, studies on physiological ecotype of weeds and machanism of herbicides and their interactions will be necessary.

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Application of remote-controlled aerial application to control weeds on the Paddy Field using benzobicyclon mixtures (농업용 무인 헬기를 이용한 benzobicyclon 혼합제의 잡초방제 효과)

  • Park, Su Hyuk;Won, Ok Jae;Eom, Min Yong;Han, Sung Min;Hwang, Ki Seon;Seo, Su Jung;Park, Kee Woong
    • Korean Journal of Agricultural Science
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    • v.41 no.2
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    • pp.113-117
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    • 2014
  • This study was conducted to evaluate the efficacy of benzobicyclon mixtures by using Remote-controlled aerial application (RCAA) to control annual and perennial weeds in rice paddy field. Eight annual weed species including Echinochloa crus-galli L. and three perennial weeds were dominated in the experimental field. Application of benzobicyclon mixtures using RCAA was highly effective to control both annual and perennial weed species. When compared with untreated control, no visual injuries were detected at single and double dosage of benzobicyclon mixtures. Finally, rice yield in the benzobicyclon mixtures was as much as that in the hand weeding. This study indicates that benzobicyclon mixtures using RCAA can be applied to control both annual and perennial weed species in rice paddy field.

Yield of Rice, Analysis of Economics and Environmental Impact in Duck-Paddy Rice (오리제초 수도작의 벼 수량, 경제성 및 환경친화성 평가)

  • 손상목;김영호;임경수
    • Korean Journal of Organic Agriculture
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    • v.9 no.3
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    • pp.45-71
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    • 2001
  • The duck-rice forming system is increasingly spread up throughout Korea since 1992. It is discussed the rice field, rice quality, weed and pest management in the duck-rice weeding system compared to conventional farming system. Moreover the optimizing duck population, system management and fertilizer application rate were reported. Energy input and output by duck-rice farming system were carefully compared with those of low input sustainable paddy field and conventional farming paddy field. To find out the environmentally sound function of duck-rice system, the total nitrogen in paddy soil and paddy water, and nitrogen cycle in paddy rice cultivation system were analysed. finally the input and output were calculated, and ecological characteristic were determined in terms of nitrogen balance, labor input, animal input, renewable energy input, turnover of soil organic matter, energy loss, non-renewable indirect and direct energy input. It was concluded duck-rice weeding system could be recommended in terms of net only environmentally sound, but also farmer's income. But there are still some research needs for successful adaption of duck-rice farming to investigate to determine the optimal population of duck in rice paddy field unit, release time of duckling, duck management after release, and strategy for duck marketing and duck processing.

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GIS application on weed control of Eleocharis kuroguwai in lowland rice field in Korea (GIS를 이용한 논 잡초 올방개의 방제연구)

  • ;;S.P.Kam
    • Spatial Information Research
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    • v.3 no.1
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    • pp.47-53
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    • 1995
  • The weed survey in lowland rice fields through Korea was conducted in 1992 to determine a change of the weed communities based on different regions, soil types, planting methods, and cultural practices. GIS was applied to identify a spatial analysis of predominant weed species in specific region. On behalf of vegetatine analysis such as absolute and relative density, absolute and relative frequency, importance value, and summed dominance ratio(SDR), there was highly dominant with a perennial weed species, Eleocharis kuroguwai Ohwi over whole country. However, in particular it was most predominant at southem area of Gyunggi province in Korea. Thus, rice farmers of this area have to introduce a specific comperhensive control strategy against this predominant weed species.

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The Realities and Problems of the Dissemination of Efficient Weed Control Methods (잡초방제 기술보급실태와 문제점)

  • Hee-Young Kang;Tea-Ha Jeon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.23 no.3
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    • pp.12-15
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    • 1978
  • The agriculture in Korea has been gradually changed from a labor-intensive type to a labor-saving one which aims to maximize productivity of labor. Herbicides have been utilized in rice farming since 1955. The consumption of herbicides rapidly increased during the last decade. However, the technology of weed control with herbicides has not been developed yet. For the dissemination of efficient weed control methods in farming, both research and extension activities on herbicide utilization should be strengthened. Appropriate research and guidance units on weed control should be established as early as possible, in order to provide the necessary technical information.

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Influence of Controlled-release Fertilizer Levels on Rice Growth, Weed Control and Nitrogen Efficiency in Paper Mulching Transplanting (벼 종이멀칭이앙 시 완효성비료 수준이 벼 생육, 잡초방제 및 질소효율에 미치는 영향)

  • Jeon, Weon-Tai;Yang, Won-Ha;Roh, Sug-Won;Kim, Min-Tae
    • Korean Journal of Soil Science and Fertilizer
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    • v.39 no.6
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    • pp.345-350
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    • 2006
  • Recently we have interest on rice products developed by environment-friendly management. The technology of paper mulching was practised without herbicide in machine transplanting cultivation of paddy. A field experiment was conducted on Gangseo series (coarse loamy, mixed, nonacid, mesic family of Aquic Fluventic Eutrochrepts) at the National Institute of Crop Science (NICS), RDA, Suwon, Gyeonggi province, Republic of Korea in 2004. This experiment was carried out to evaluate rice growth, weed control and nitrogen efficiency by the different controlled-release fertilizer levels in paper mulching transplanting. Treatments consisted of conventional fertilization, controlled-release fertilizer (100%, 80%, 60%) compared with nitrogen amount ($110kg\;ha^{-1}$) of conventional fertilization and no nitrogen plot. Mulching paper consisted of recycled paper which was coated with biodegradable plastics. There were no differences between conventional rice transplanting and paper mulching on missing hills. Weed occurrence and control were diverse and low as fertilizer amount increased. Plant height and tiller number per hill increased as fertilizer amount decreased. There were no difference between controlled-release fertilizer 80% and conventional fertilization plot on rice growth traits. Leaf color and $NH_4{^+}-N$ in soil had similar trends. There was no difference in yield between controlled-release fertilizer 80% and conventional fertilization plot. Agronomic nitrogen-use efficiency was high as fertilizer amount decreased. Therefore, these results suggested controlled-release fertilizer 80% should be optimum amount under paper mulching transplanting of rice considering weed control, rice growth and nitrogen efficiency.

GIS Application in Weed Management System - 1. Regional and Yearly Shifts in Weed Population (GIS 이용 잡초관리체계 연구 - 1. 우리 나라 논 잡초 발생밀도의 지역 및 연차변화)

  • Park, Kwang-Ho
    • Korean Journal of Weed Science
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    • v.18 no.4
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    • pp.356-363
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    • 1998
  • In general weed vegetation analysis has been applied to the study of weed population shift. However, it is a limited tool for understanding a problem region and a specific weed species in a certain area. Recently GIS may be used as an important tool to solve this target or to conduct specific field analysis which enables to introduce a reasonable management strategy. Thus, the GIS study was carried out to understand an integrated weed population changes between 1981 and 1992 in Korea. The nationwide weed survey was performed through the whole rice paddy fields in 1981 and 1992. Weed occurrence was totally different over whole country based on these data. In 1981 a region with high weed occurrence was at western and central areas of Korea in terms of weed population density but this was changed into western and southern area in 1992. In both years there were high weed population density at Taean, Seosan county of Chungnam province in Korea. Thus, this particular area may be needed to introduce a special strategy to reduce weed population density and/or to control problem weed species.

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