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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Weed Science
Journal Basic Information
Journal DOI :
The Korean Society of Weed Science
Editor in Chief :
Volume & Issues
Volume 28, Issue 4 - Dec 2008
Volume 28, Issue 3 - Sep 2008
Volume 28, Issue 2 - Jun 2008
Volume 28, Issue 1 - Mar 2008
Selecting the target year
Weed Control by Weeder Machine in Transplanted Rice Paddy Field for Mechanical Weed Control
Won, Jong-Gun ; Ahn, Deok-Jong ; Kim, Se-Jong ; Park, So-Deuk ; Choi, Chung-Don ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 1~7
This study was carried out to determine the effect of weed control by weeder machine and the number of treatments for mechanical weed control in paddy rice field. As the number of treatment of weeder machine were repeated, the efficacy of weed control was increased. It was 37.3~74.1% for using only one time, 71.5~81.6% for two times and 82.9~95.5% for three times, respectively. The reducing effect of labor hours was 95% for two times and 93% for three times compared to that of hand weeding. In determining the inputting time of the weeder machine after rice transplanting, as the inputting time was delayed, the effect of weed control was reduced and rice yield also decreased, suggesting the higher competition between rice and weeds as the inputting time was delayed. As the result, the most critical inputting time of the weeder machine which can gain more than 70% of weeds control and more than 5.0t ha-1 of rice yield was determined before 20 days after transplanting of rice at least.
Plant Community Change in the Habitat of Humulus japonicus
Park, Jae-Eup ; Lee, In-Yong ; Park, Jin-Young ; Kwon, Oh-Seok ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 8~14
In order for the effective biological control of Rumex obtusifolius on pasture, the potential insect agents have been selected. Gastrophysa atrocyanea and Ostrinia palustralis memnialis were finally selected as control agents, and their basic ecological characteristics and weeding efficacy were investigated. Non-choice test showed that the finally selected two species were suitable candidates for the biological control of R. obtusifolius since they showed negative host specificity against major 38 test crops and plants. Both laboratory and field experiments on weeding efficacy resulted in positive promise of biological control success on R. obtusifolius by practical application of insect agents.
Plant Community Change in the Habitat of Humulus japonicus
Oh, Young-Ju ; Lee, In-Yong ; Park, Jae-Eup ; Oh , Se-Mun ; Kim, Chang-Seog ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 15~19
The effect of Humulus japonicus community on the vegetation change was investigated in the Middle area of Korea. The habitats of Humulus japonicus were classified into bare land, orchard, roadside, edge of upland, streamside, edge of forest and fallow upland. Humulus japonicus in upperstory and understory vegetation showed the highest impotance value among plants. In the upperstory vegetation, the importance values of Artemisia princeps, Conyza canadensis, Erigeron annuus, Chenopodium album var. album and Persicaria perfoliata were 7.5, 6.3, 5.6, 5.0 and 5.0 respectively. While, in the understory vegetation, Stellaria aquatica and Galium spurium var. echinospermon were investigated to have the highest importance value among plants. The importance values of Persicaria thunbergii, Equisetum arvense and Artemisia princeps were 6.8, 6.7 and 6.4 respectively. Species diversity and Evenness were more higher in the upperstory vegetation than the ones in understory vegetation. Understory vegetation showed the higher dominance than the upperstory vegetation except June.
Absorption and Translocation of Penoxsulam in Eleocharis kuroguwai Ohwi. and Cyperus serotinus Rottb
Moon, Byeong-Chul ; Joo, Jeong-Rae ; Park, Tae-Seon ; Park, Jae-Eup ; Park, Sang-Won ; Min, Yi-Ki ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 20~24
Absorption and translocation of penoxsulam on Eleocharis kuroguwai Ohwi., Cyperus serotinus Rottb., and Oryza sativa L. was estimated using 14C-labeled penoxsulam. This study showed highest absorption rate of 14C-penoxsulam in rice, and followed by C. serotinus and E. kuroguwai. E. kuroguwai showed 40% absorption of entire amount of 14C-penoxsulam within 30 minutes after treatment, and its absorption amount until 72 hours was not increased any more. Response of penoxsulam to E. kuroguwai was proved to be absorbed fast in 30 minutes after treatment. The translocation of penoxsulam from leaves of E. kuroguwai and C. serotinus to those each plant part was detected as low amount of 2 to 3% except treated leaf. However, even if translocation rate to other parts of plants was very little, it was ascertained that 14C-penoxsulam was translocated from its treated leaf to tuber and shoot, and root of daughter plant of E. kuroguwai and C. serotinus.
Competitive Effect of Ammannia coccinea Rottb on Growth and Yield of Rice in Paddy Field
Shen, Xiang-Ri ; Kim, Do-Soon ; Pyon, Jong-Yeong ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 25~31
To estimate the critical period of competition between the Ammannia coccinea and rice, A. coccinea was weeded by each two weeks until 14 weeks after emergence in one set. In the other set, respective plots were weeded out and A. coccinea was remained to grow and compete with rice after controlling by 2-week interval until 14 WAE. Gompertz model was used to analyze the linear change of yield affected by different treatments and critical period of weed competition by A. coccinea. From 2 WAE to 4 WAE, number of A. coccinea increased from 126 to 640 plant m-2. Although it kept increasing until harvest, it seems like that the group emerged in the first 4 weeks took the most role of competition with rice in paddy field. Until 6 WAE, dry weight of A. coccinea was 76.5 g m-2 and it increased more than 3 times to 241.3 g m-2 in the two weeks afterward. Generally, longer the competition periods, more the yield decreased by A. coccinea. In comparison with control, yield of rice was to 4,127 kg ha-1 (21% decreased) after 14-week competition period. Response to the sharply increasing biomass of A. coccinea 6 WAE, rice yield decreased significantly to low level from 8 weeks of competition. As weed-free maintenance period of A. coccinea increased rice yields was increased. A. coccinea emerged at 8 weeks after emergence had less competition on the rice yield. Rice yields were constant after 8 weeks weed-free periods comparing with those with shorter weed-free periods. This study indicates that the critical period of A. coccinea competition with rice is between 39 and 60 days after transplanting.
Weed Emergence in Upland Field of Summer Crop Cultivation in Honam Area
Im, Il-Bin ; Kim , Sun ; Ahn, Seng-Hyen ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 32~41
In order to get basic information for an effective control method of weed in upland fields, a weed survey was conducted in the southwest region of Korea in 2002. A total of 102 species of 29 families was collected in the upland fields of all summer crops, and grasses were 25% in dominance. In the soybean fields, 43 species of 20 families was collected, and grasses weeds 30% in dominance. The dominance indexes were high in the order of Digitaria ciliaris, Portulaca oleracea and Cyperus amuricus. In the sesame fields, 38 species of 18 families was collected, and the dominance of Portulaca oleracea was 26%. The dominance indexes were high in the order of Portulaca oleracea, Digitaria ciliaris and Cyperus amuricus. In the red pepper fields, 48 species of 15 families was collected, and the dominance of Digitaria ciliaris was 30%. The dominance indexes were high in the order of Digitaria ciliaris, Portulaca oleracea and Cyperus amuricus. In the ginger fields, 90 species of 26 families was collected, and grasses were most dominated as 23%.
A Taxonomic Study in Early Stage on the Genus Conyza and Erigeron (Asteraceae) Weeds of Korea
Kim, Chang-Seok ; Chung, Young-Jae ; Oh , Young-Ju ; Oh, Se-Mun ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 42~51
This study was conducted to make the easy identification methods in early growing stages to seven taxa of the genus Conyza (Conyza conadensis, C. sumatrensis, C. bonariensis, C. parva) and Erigeron (Erigeron annuus, E. strigosus, E. philadelphicus) weeds in korea.In the rosette stage, the hair on petiole and leaf blade were very useful characters for identification of the seven taxa. The length of hair on the petiole of E. strigosus was within 1mm long, while the others were 2∼3mm long. All over the petiole of C. sumatrensis and C. bonariensis were covered with dense hair. In genus Erigeron, only E. philadelphicus was covered with dense hair below part of the petiole.In the bolting stage, distribution pattern, texture, color of hair on stem were very useful characters. The hair patterns on stem were four types as fallows：1) entirely uniform hair of stem, 2) sparsely hair of upward stem and densely hair of downward stem, 3) densely hair of downward stem and densely strigose on the vertical striations, 4) sparsely or densely hair of downward stem and glabrous or shortly sparse hair of upward stem. The stem of E. philadelphicus had hollowed pith, while others were filled solidly with white cancellate tissue. The forms of cauline leaf such as leaf margin and leaf base could be divided into two group; same shape and difference shape by the form of upper and lower leaf. Therefore morphological characters of cauline leaf were very useful characters for identify.
Effect of Inhibition on Weed Occurrence by Soil-surface Hardness Materials
Park, Nam-II ; Lee, In-Yong ; Park, Jae-Eup ; Lee , Young-Kee ; Ji , Seung-Hwan ; Lee, Yong-Ki ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 52~60
This study was conducted to selection of soil-surface hardness materials and establishment of theirs using techniques in upland field for 2 years (2005 2006). The soil-surface hardness materials were selected 3 types[carboxy methyl cellulose (CMC), water glass (Wg), polyvinyl acetate (PVAc)], and optimum concentration of each materials was decided. Soil hardness by treated with PVAc+Wg and PVAc+Wg+CMC plots among soil-surface hardness materials 2.3∼3.2 times harder than untreated plot, but the degree of soil hardness decreased by passing of time. The inhibition rate of weed emergence of CMC fb. Wg was over 80% in 2005 year and PVAc+Wg+CMC plot was over 90% in 2006 year in open field. In 2006 year the inhibition rate of weed emergence was similar to pendimethalin EC plot, but the inhibition rate of weed emergence was rapidly down from 40 50 days after treatment. Because of affected heavy rain fall in cultivated period. Otherwise, the inhibition rate of weed emergence of planted rose, in greenhouse condition was higher than the open field after lasted 40 days. There were not the phytotoxicity for the tested crops such as soybean, red pepper, chinese cabbage and rose by the soil-surface hardness materials.
Effects of Alone- or Mixute-treatment of Essential Oils on Upland Weeds and Crops
Choi, Sung-Hwan ; Gu, Hong-Mo ; An, Jae-Young ; Nam, Jin-Sun ; Kim, Hyeong-Hwan ; Chun, In-Kyu ; Lee, Jeung-Joo ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 61~68
This study was conducted in a greenhouse and upland field to characterize herbicidal activity and phytotoxicity of essential oils. Anise (Pimpinella anisum), castor (Ricinus communis), clove (Syzygium aromaticum), linseed (Linum usitatissimum), peppermint (Mentha piperita), pine (Pinus spp.), rosemary (Rosmarinus officirnalis), thyme (Thymus vulgaris), turpentine (Pinus spp.) and wintergreen (Gaultheria fragrantissima) oils were applied as aqueous emulsions plus a nonionic surfactant to upland weeds and crops. Herbicidal activities of clove oil (CLO), anise oil (ANI), pine oil (PIN) and wintergreen oil (WIN) were the highest. They caused browning among tested ten essential oils were highly effective. When the total amount of essential oils in the mixtures of CLO( 120)+PIN( 80)：20.8g -1, CLO( 120)+PIN( 80)+ANI( 80)：33.3g -1 and CLO( 120)+ PIN( 80)+ANI( 80)+WIN( 80)：45.8g -1 were foliar-treated to large crabgrass and common lambsquarters grown under the upland condition, synergistic interactions were observed. Herbicidal activities of combination essential oils were 78.5, 92.5 and 100%. The herbicidal symptoms were browning, bleaching and desiccation in plant leaves. Consequently, the mixture of essential oils (3 and/or 4 way) has a synergistic interaction.
Germination Characteristics and Weeding Effect of Exotic Weed Xantium strumarium var. glabratum Occurred in Grassland
So, Jae-Sung ; Lee, In-Yong ; Park, Jae-Eup ; Lee, Yong-Ki ; Oh, Jin-Bo ;
Korean Journal of Weed Science, volume 28, issue 1, 2008, Pages 69~74
This study conducted to control exotic weeds, Xantium strumarium var. glabratum. by several herbicides and to investigate on germination X. strumarium var. glabratum is aggressively colonizing in grassland of Jeju island. The optimum temperature for germination of X. strumarium var. glabratum occurred at constant temperature of 30 and 33 . This weed was more effectively controlled by dichlobenil GR, dicamba SL, mecoprop SL, and the combination of pendimethalin EC and mecoprop SL. Determined optimum timings of herbicide applications as follows; dichlobenil GR was soil treated on late February to early March in pasture path or non cultivated land. And the other herbicides(foliar herbicides) were treated from late June to mid July when this weed plant height were 30∼60cm.