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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Weed Science
Journal Basic Information
Journal DOI :
The Korean Society of Weed Science
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Volume & Issues
Volume 3, Issue 2 - Dec 1983
Volume 3, Issue 1 - Jun 1983
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Integrated Weed Management in Rice in the USA
Smith,Jr., Roy J. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 1~13
Ecological Characteristics of Local Collections of Cyperus serotinus Rottb. and Their Geographical Differentiation
Seong, Ki-Yeong ; Kwon, Yong-Woong ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 14~22
To study ecological characteristics of Cyperus serotinus occuring in Korea its propagules were collected from 6 locations from the northern part to the southern part of Korea (Chuncheon, Suweon, Iri, Jeonju, Gwangju, Milyang) in 1981, cultured and replanted 4 times (May 20, June 5, June 20, July 5) in 1982. They flowered from August 10 to August 29 in the plants planted on May 20 and from August 22 to September 4 in the plants planted on July 5. Plant height, number of tillers and top fresh weight were 85-100cm, 375-1,500 tillers/
, respectively, when they were planted on May 20, and 58-67cm, 300-625 tillers/
, respectively, when they were planted on July S. Weight of seeds and number of rhizomes per plant were 20-50g/
and 20.75-61, respectively, whey, they were planted on May 20, and 5-17.5g/
and 51.5-80.25 when they were planted on July 5. Local collections showed. the same morphological characteristics at the level of species identification, but there existed variations among the local collections. Cyperus serotinus from Chuncheon and Suweon were longer in the length of inflorescence, than those from Gwangju and Milyang and rhizomes from Chuncheon and Suweon were thicker than the others. Each of local collections may be regarded as different ecotype based on the above mentioned differences in morphology, growth and flowering response to the planting date. The results appear to imply that Cyperus serotinus weeds occuring in various locations of Korea are different one another in competitive ability with rice crop.
Ecological Characteristics of Local Collections of Eleocharis kuroguwai Ohwi. and Their Geographical Differentiation
Kwon, Yong-Woong ; Seong, Ki-Yeong ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 23~28
To study ecological characteristics of Eleocharis kuroguwai occuring in Korea its propagules were collected from 6 locations from the northern part to the southern part of Korea (Chuncheon, Suweon, Iri, Jeonju, Gwangiu and Milyang) in 1981, cultured and replanted 3 times (May 20, June 5, June 20) in 1982. They flowered from August 5 to August 27 when they were planted on May 20, and from August 20 to August 27 when they were planted on Tune 20. Plant height, number of tillers and top fresh weight/
were 50-90cm, 500-875, and 175-750g, respectively when they were planted on May 20, and 40-70cm, 250-625, 325-625g, respectively when they were planted on June 20. Number of tubers per plant were 0.98-1.98 when they were planted on May 20, and 1.81-2.87 when they were planted on June 20. Eleocharis kuroguwai from Chuncheon or Suweon was more open in plant type, shorter in plant height, narrower in diameter of pedicel and shorter in inflorescence than those from Iri, Jeonju or Gwangju. Each of the local collections may be regarded as different ecotype, based on the above differences in morphology and responses in growth and flowering to the planting dates. The results appear to imply that Eleocharis kuroguwai weeds occurring in various locations of Korea are different one another in competitive avility with rice crop.
Ecological Characteristics of Digitaria sanguinalis in Temperate Climate
Shin, D.H. ; Kim, K.U. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 29~38
Growth habit, intraspecific competition of Digitaria sanguinalis, and interspecific competition between soybean and D. sanguinalis were evaluated to obtain the basic informations on establishing an effective control measure in upland corps. The earlier planting on April 1 produced approximately 3.5 times higher dry matter than that of the latest planting on July 22 and resulted in the earliest heading on July 8 and the latest heading was observed on September 4 planted on July. 22, but the interval between planting and heading dates was shortened progressively as the planting dates were delayed, showing irregularity of heading within a hill. Tiller numbers per plant were inhibited as densities increased from one to forty. One plant planted per pot produced significantly higher tiller numbers than density of 5 to 40 plants per pot. However, total tiller numbers was the highest in density of 40 plants planted per pot. Regardless of planting densities used, D. sanguinalis at all densities produced the similar dry matter per pot, showing severe intraspecific competition as density increased, but on each plant basis dry weight production was the highest in the lowest density such as one plant planted per pot. Competition between soybean and D. sanguinalis for the entire growing season decreased the total dry weight of soybean by 59.6%. Soybean required the maintenance of a weed free condition, about 3 to 4 weeks immediately after seeding, for obtaining the maximum yield, beyond which soybean crops effectively suppressed the growth of D. sanguinalis.
Interspecific Competition of Paddy Rice Isogenic Lines in Plant Type with Some Perennial Weeds
Kim, I.K. ; Guh, J.O. ; Kwon, S.L. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 39~49
By use of three paddy rice lines as the near-isogenic in plant type (Broom, Open, and Spread type in tillering angle), the interspecific competition patterns of rice plants with three important weed species (Cyperus serotinus, Eleocharis kuroguwai, and Potamogeton distinctus) under the three densities of weed standing (0.25 and 50 percent of the rice plants), were observed. Under the experimented conditions, paddy yields were varied more significantly with weed competition descriptions than with plant types of paddy rice. And spread typed rice was more competitive to the detected weed species, however, the broom and spread typed rice were to Potamogeton SP, among others. The result of the clustering analysis of crop-weed competition patterns, estimated by 1-Q mode correlation coefficients, indicated that the first-order component affecting the competition patterns of crop-weed was rather the plant types of rice than either weed species or weed standing densities.
Response of Weed Population to Long-term Fertilizer Application
Ku, Y.C. ; Oh, Y.J. ; Lee, J.H. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 50~56
A study was conducted to evaluate the weed population as affected by repeated application of fertilizers for 15 years (nonfertilized, PK, NK, NPK, NPK+Compost, NPK+Straw and NPK+lime). Alopecurus aequalis authority did not grow at all without P application and lime reduced the population of A. aequalis. Total number of weeds were the largest at 5-10cm soil layer and increased by application of compost and straw. Monochoria vaginalis dominated in NPK+compost and NP plot. Scirpus hotarui dominated in NPK+straw. Both Eleocharis kuroguwai and Potamogeton distinctus dominated in nonfertilized plot. Numbers of M. vaginalis and S. hotarui were larger low pH 6 while that of E. kuroguwai and P. distinctus at pH 6 to pH 7. Incidence of M. vaginalis and S. hotorui was great at pH's lower than 6, while E. kuroguwai and P. distinctus favored pH's ranging from 6 to 7.
Differential Weed Competition of Two Rice Cultivars under Various Cropping Patterns
Guh, J.O. ; Kwon, S.L. ; Heu, S.M. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 57~68
To estimate the possible amount of weed-crop competitions under the various cropping patterns of two rice cultivars of different type, comparisons between weedy check and weed-free plots in plant height, tillering number, and plant weight were investigated. Fluctuations in Importance Value, competition value, and net productivities were used to discuss the crop-weed competition, respectively. As a result, differences in dominant weed species, competitive crop variety, most effective cropping pattern, and crop yielding characteristics under the different weed competitions were investigated, respectively.
Study on the Behaviour of Mixtures of Herbicides in Transplanted Lowland Rice Field
Kim, S.C. ; Choi, C.D. ; Lee, S.K. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 69~74
The behaviour of mixtures of herbicides was determined to obtain the basic informations about effective herbicide use, enhancing herbicidal efficacy and reducing the chemical cost. Fourteen herbicides with 91 mixed combinations were evaluated by Limpel et al method at the Echinochloa crus galli Beauv-Monochuria vaginalis Presl.-Scirpus hotarui Ohwi (importance values of these weeds were 63%, 16% and 10%, respectively) community type. Thirty eight mixed combinations showed the antagonistic response. Among these 14 mixed combinations including chlormethoxynil + naproanilide mixture were greater than 11% in antagonistic effect. On the other hand, 40 mixed combinations including chlormethoxynil + SW751 mixture showed additive response (
). For synergistic response, 13 mixed combinations were belonged to this group. Particularly, 3 mixed combinations, chlormethoxynil + butachlor, chlormethoxynil + bifenox and nitrofen + ACN/MCPB/nitrofen mixtures were greater than 11% in synergistic effects. The mixture of thiobencarb + oxyfluorfen was analyzed by isobole technique. This mixture showed the synergistic response and the interaction index was approximately 2. The most optimum mixtur for inducing 90%n weed suppression was 0.012 kg ai/ha for oxyfluorfen and 0.45 kg ai/ha for thiobencarb.
Studies on Controlling Mixed Annual and Perennial Weeds in Paddy Fields - On the Herbicidal Properties of Perfluidone -
Ryang, H.S. ; Han, S.S. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 75~99
The herbicidal properties of perfluidone [1,1,1-trifluoro-N-2-methyl-4-(phenylsulponyl) phenyl methanesulfonamide] were investigated in pots and paddy fields. At the rate of 2.0kg prod./10a, perfluidone did not cause any injury to the 4 leaf stage (LS) rice seedlings. Although the crop injury increased with increasing the application rate, the injury caused by 16kg prod. perfluidone/10a gave rise to only 30% yield reduction. The crop injury was greatest when perfluidone was applied 2 days before transplanting and decreased as the application time delayed. Perfluidone showed greater crop injury to the 3 LS seedlings, at more than 7cm water depth, and at high temperature than to the 4 LS seedlings, at 3-5cm water depth, and at low temperature. Indica and indica
japonica rice varieties were generally more sensitive to perfluidone than japonica rice variety. Perfluidone effectively controlled most of annual weeds and such perennial weeds as Sagittaria pygmaea MIQ., Potamogeton distinctus A. BENN, Cyperus serotinus ROTTB, Scirpus maritimus L., Eleocharis kuroguwai OHWL, and Scirpus hotarui OHWL, whereas Sagittaria trifolia L. and Polygonum hydropiper SPACH. were tolerent to perfluidone. The weeding effect decreased with increasing the leaching amount of water and the overflowing of irrigated water within 24 hours after the herbicide application. When the application time was done later than 8 days after transplanting, the perennial weeds were shown at deeper soil layers, and the standing water was deeper than 7cm, the effect tended to decrease. However, there was no difference in the weeding effect between soil types. Downward movement of perfluidone in flooded soil ranged from 2 to 8cm deep. The movement increased with increasing the leaching amount of water and the application rate and at a sandy loam soil which possessed less adsorptive capacity. Residual effect of perfluidone was found at 35 to 80 days after application, which varied such factors as Soil types. Increase in the leaching amount of water resulted in decrease in the period of the residual effect. The period was shorter at non-sterilized soil than at sterilized soil. The 0.75kg ai perfluidone + 1.5kg ai SL-49 (1,3-dimethyl-6-(2,4-dichlor-benzoyl)-5-phenacyloxy-pyrazole)/ha and 1.5kg ai perfluidone + 1.05kg ai bifenox (2,4-dichlorophenyl-3-methoxy carbonyl-4-nitro phenyl ether)/ha showed less crop injury than 1.5kg ai/ha perfluidone alone. However, the weeding effect of the former was similar to that of the later.
Response of Barley Cultivars to Butachlor, Terbutryn, and Methabenzthiazuron
Pyon, Jong-Yeong ; Kim, Tae-Hoon ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 100~104
Responses of barley cultivars including 8 covered barley cultivars and 8 naked barley cultivars to butachlor, terbutryn, and methabenzthiazuron were evaluated by determinating crop injury, dry weight and chlorophyll content of barley seedlings. Most barley cultivars were tolerant to butachlor at 1478 ai/10a (recommended rate) but Olbori, Dongbori, and Gangbori were slightly sensitive to butachlor at 294g ai/10a. Sensitivity to terbutryn was generally greater in naked barley cultivars than hulled barley cultivars. Dongbori, Buhobori, and Bunong of hulled barley and Bangsa #6, Kwangseung, Nonsangwa # 1-6, and Iri #4 of naked barley were highly sensitive to terbutryn at 350g ai/10a (double dosage). Most barley cultivars were relatively tolerant to methabenzthiazuron except Iri #4. Dry weight of barley seedlings was not reduced by butachlor, terbutryn, and methabenzthiazuron at recommended rate. However, terbutryn at 350g ai/l0a greatly reduced dry weight of all barley cultivars, especially naked barley cultivars. Chlorophyll content of Owealbori, Dongbori #1, Jogangbori, Bangsa #6, Backdong, and Kwangseung was slightly reduced by butachlor. Terbutryn at 175g ai/10a reduced chlorophyll content of Owealbori, Olbori, and Nonsangwa #1-6 and all cultivars were greatly reduced by terbutryn at 350g ai/10a. Methabenzthiazuron slightly reduced chlorophyll content of Jogangbori, Dongbori #1, Owealbori, Backdong, Kwangseung, and Nonsangwa # 1-6.
Studies on the Selection of Effective Herbicides in Polyethylene Film Mulching Culture of Garlic (Allium sativum L.)
Jung, J.W. ; Youn, K.B. ; Jo, J.T. ; Song, Y.J. ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 105~110
In order to select the effective herbicides on polyethylene film mulching culture of galic (Allium sativum L) for weed control in early and low temperature condition, several experiments were conducted at the Chungbuk Provincial Office of Rural Development from 1978 to 1982. The dominated weed in the open field was Chenopodium album (98.1%), and there were many Rvrippa globosas (39.7%), and Dtgitaria sanguinalis (34.3%) in the polyethylene film mulching culture. Effective herbicides in polyethylene film culture were alachlor EC, pendimethalin EC, oxyfluorfen EC, and acifluorfen EC. After the 15th May, metabenzthiazuron WP and prometryne WP for the gramineous weeds were effective. There was a little chemical injury on acifluorfen EC application, but not another influence on the yield. With the effective herbicides application in the polyethylene film mulching culture, yield (22-23%) and profits (26.84) to the nonmuiching culture were increased. Increase of yield (20%) and profits (56%) in black opaque polyethylene film mulching culture compared with the conventional culture was possible.
Report on " The Fifth International Congress of Pesticide Chemistry " Held at Kyoto
Kim, Kil-Ung ;
Korean Journal of Weed Science, volume 3, issue 1, 1983, Pages 111~115