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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 11, Issue 3 - Sep 1991
Volume 11, Issue 2 - Jun 1991
Volume 11, Issue 1 - Mar 1991
Selecting the target year
Controlled Release of Oxyfluorfen from the Variously Complexed Formulations IV. Effect of Water Level Depths on the Activity of Selected Formulations
Guh, J.O. ; Chon, S.U. ; Kuk, Y.I. ; Kwon, O.D. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 159~166
Seven oxyfluorfen formulations were tested for control of 8 weed species and rice injury under four different water depths with various ages of rice seedlings. Among formulations tested, rice injury was slight by formulations of Elvan, Coal Slag, Chitosan and Bentonite B under 0 cm or shallow water depths, and by those of Elvan and Coal Slag under deep water conditions. Weed control was high by Bentonite A and B, and Chitosan, and was low by Elvan. Coal Slag and Sand coated oxyfluorfen, if the target weeds of oxyfluorfen are annual species, further development of Elvan, coal slag, chitosan and Bentonite A would be controlled to increase control efficacy or to decrease rice injury.
Controlled Release of Oxyfluorfen from the Variously Complexed Formulations V. Effect of Water Leakage on Injury and Efficacy of Selected Formulations
Guh, J.O. ; Kwon, O.D. ; Kuk, Y.I. ; Chon, S.U. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 167~173
Various formulations of oxyfluorfen were tested to evaluate effect of weed control efficacy and rice injury as affected by different degrees of water leakages. Rice injury was increased with increased water leakages. The formulations of Elvan, Coal slag and Chitosan gave slight injury to rice under all conditions included in terms of visual ratings, plant height and fresh weight production. However, weed control of most formulations was decreased and increased with increased water leakages for annual weeds and perennial weeds, respectively, Annual weeds were controlled greater than 90~ by all treatments, but perennial weed control was relatively low. Scirpus juncoides was the most tolerant annual weed to Oxyfluorfen. Elvan formulation showed somewhat decreased control of barnyardgrass with increased water leakages. The promising formulations of Oxyfluorfen were Chitosan, Coal slag, Bentonite B and Elvan (if the first releasing rate increased), which injured rice slightly and controlled annual weeds excellently regardless of degrees of water leakages.
Effect of Transplanting Depths on Growth of Transplanted Rice by Dithiopyr
Ryang, H.S. ; Han, K.W. ; Moon, Y.H. ; Choi, Y.C. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 174~177
This study was conducted to determine the influence of dithiopyr on growth of transplanted rice with different transplanting depths and the amount of
-dithiopyr adsorpted in the root and shoot of rice plants under paddy soil conditions. The growth rate of transplanted rice was lower in 0 and 0.25cm of transplanting depths with exposed basal stem than in 1 and 2cm of the depths in control plot. In the growth of transplanted rice treated with dithiopyr, plant hight and dry weight were significantly inhibited in 0 and 0.25cm depth plots but not affected.in 0.5, 1, 2 and 4cm depth plots, and roop length were influenced in 0, 0.25 and 4cm depth plots but not in 0.5, 1 and 2cm depth plots. The amount of ratioactivity in shoot and root of rice plants as affected by
-dithiopyr were the highest in 0 and 0.25cm depth plots and decreased in over 0.5cm depth plots. However the extent in amount of distributed radioactivity in the plants among the different transplanting depths was narrow gradually with the growth of plants. Therefore, injury of transplanted rice by dithiopyr is little in over 0.5cm transplanting depth with burried basal stem and the inhibition on rice plants with extreme shallow transplanting such as 0 and 0.25cm depths should be due to more adsorption of dithiopyr.
Competition between Crop and Weed and Weed Control in Dry Direct Seeded Rice
Yeun, K.B. ; Kim, K.U. ; Shin, D.H. ; Lee, I.J. ; Jung, J.W. ; Kim, H.K. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 178~186
This study was conducted to evaluate the major weeds occurred in direct seeded rice and their compition with rice, and to establish the effective weed control method. The important weeds occurring in dry direct seeded rice were Echinochloa crusgalli, Cyperus amuricus, Rorippa islandica, etc. Among them, Echinochloa crusgalli was the most dominant weed species. In view of the Simpson's dominance index, the maximum number of the weeds was observed at 30 days after seeding, showing 0.26, but decreased as the time passed. In other hand, Simpson's dominance index of weed dry weight increased from 0.09 at 15DAS(days after seeding) to 0.28 at 60DAS indicating that particular weed such as barnyardgrass was dominating the fields. The plant height and the tiller number of rice in the dry direct seeded rice were not greatly affected by the time and duration of competition with weeds, but rice yield was greatly influenced by them. The yield reduction was observed when compition between rice and weeds were initiated at 20 to 40 DAS till the harvesting time. The highest weed control efficacy was observed at the treatment of systematic herbicide application such as soil applied Butachlor followed by Mefenacet/Bensulfuron-methyl/Dymron at 30 DAS after seeding, and soil applied Dimepiperate/Bensulfuron-methyl mixture as a preemergence type gave also an excellent control.
Absorption, Translocation and Metabolism of Naproanilide in Rice and Paddy Weeds under Different Temperature Conditions
Park, C.W. ; Pyon, J.Y. ; Kim, Y.W. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 187~194
Absorption and translocation, and metabolism studies using
-naproanilide were conducted to determine selective mode of action of naproanilide in rice and paddy weeds under different temperature conditions. Absorption amount of
-naproanilide was greater in Cyperus serotinus and Sagittaria pygmaea than rice and Echinochloa crusgalli. Especially, absorption of
-naproanilide in C. serotinus was increased twice at 32
and 48 hour exposure conditions.
-naproanilide in roots was translocated to shoots very little in rice and E. crusgalli, but S. pygmaea somewhat greater translocation than the other species. In C. serotinus and S. pygmaea, susceptible weeds, metabolic rates of naproanilide into phytotoxic NOP (2-(2-naphthoxy)-propionic acid) and NOPM (methyl 2-(2-naphthoxy) propionate) were significantly greater than in rice and E. crugalli, tolerant species. Consequently, differential uptake by roots and the difference in activation metabolism of naproanilide among species may explain the possible mechanism of selectivity.
Responses of Rice Cultivars to Glufosinate-ammonium
Hong, S.Y. ; Kim, K.U. ; Shin, D.H. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 195~204
This study was conducted to determine physiological responses rice cultivars to glufosinate-ammonium. Changes of total protein content, protein population, glutamine synthetase activity, accumulated ammonia content and free amino acid composition were examined in both tolerant and susceptible rice cultivars. Tamjinbyeo and Fukei 126 showed relatively tolerant response to glufosinate-ammonium while Namyeongbyeo, Palgongbyeo and Youngdugbyeo were susceptible to it. Total protein content of two tolerant cultivars was 93.2 of the untreated control in average but three susceptible cultivars showed 76.5 of the untreated control in average, showing 16.7 difference. Protein profiles of the tolerant cultivars seemed to be not affected by glufosinate-ammonium treatment. However, in susceptible cultivar like Namyeongbyeo, 10ppm of glufosinate-ammonium application resulted in decrease of band density or disapperance of spot density in near 20kD and in between 45kD and 66kD on 2D-PAGE. Glutamine synthetase activity in susceptible cultivars was markedly inhibited by glufosinate-ammonium treatment, accompanying remarkable increase of ammonia content by three times greater than tolerant cultivars, and markedly increase of glutamic acid, showing 430% of the untreated control.
Development of Freezing Resistance of Eleocharis kuroguwai Tuber
Shin, H.S. ; Chun, J.C. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 205~210
The freezing resistance of Eleocharis kuroguqai was evaluated in artifical and natural freezing conditions in relation to tuber size, depth of tuber burial and soil moisture conditions. Osmotic potential of immature and mature tuber of E. kuroguqai before hardening was -12.1 and -23.5 bar, respectively, but decreased to -61. 0 and -67.1 bar after 120-day hardening period. Percent survival of E. kuroguqai tubers during the winter period was 13% and 67% in dry and moist moisture conditions at burial of 5cm depth, but all tubers were survived in the three moisture conditions employed when buried at 25cm depth. Greater decrease of osmotic potential was observed in tubers buried at 5cm depth than tubers buried at 25cm depth, resulting in greater freezing resistance in the former. Large tuber was more susceptable to freezing temperatures than small tuber.
Studies on the Allelopathic Effects of the Several Weeds
Shim, S.I. ; Sonn, J.K. ; Lee, S.G. ; Kang, B.H. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 211~218
The allelopathic potentials of several Korean weeds were inverstigated in the greenhouse and laboratory. Aqueouse extracts and plant litters of several weeds were tested at different dilutions for allelopathic effect on germination and Barley growth of crop species. Among the several species of weeds. Portulaca oleracea and Chenopodium album had the highest allelopathic effect to the four species to 30%, while the extract of Portulaca oleracea increased those to 4.7% on an average when compare with control plant. In greenhouse experiment Portulaca oleracea highly reduced the emergence rate indices of barley, soybean. radish and corn to 30, 49, 36 and 68% that of control plant, respectively. Plant height and dry weight of indicate plants were reduced by the residues of Portulaca oleracea and Chenopodium album.
Germination and Emergence of Major Upland Weeds I. Effects of Media and Low Temperature on Germination of Weeds
Woo, I.S. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 219~223
Effects of media and low temperature on germination of weeds were examined to get basic information for establishing weed control methods. Soil and agar(0.4%) was good media for germination of weeds at laboratory. Germination was improved by placing weed seeds at 5
low temperature for 10-20 days. Germination was improved by storing weed seeds in water absorbed gauge and in vinylbag at 5
low temperature for 30-40 days. Germination was increased by burial of weed seeds at 10cm of soil depth for 30-60 days.
Germination and Emergence of Major Upland Weeds II. Effects of Soil Depth, pH and Fertilization on Emergence of Weeds
Woo, I.S. ;
Korean Journal of Weed Science, volume 11, issue 3, 1991, Pages 224~228
This study was carried to know factors affecting emergence of major upland weeds in soil in order to get basic information on weed control methods. Firthy eight percent of weed seeds were distributed within soil surface to 10cm in soil and 2% of weed seeds were observed in 40~50cm soil layer in field. As planting depth was deeper, emergence of weeds became poor. However Capsella bursa-pastoris can emerge at soil surface. Amaranthus retroflexus, Amaranthus lividus, Porturaca oleracea, Chenopodium album, Solanum nigrum upto 3cm, Eleusine indica, Echinochloa crus-galli, Setaria viridis, Digitaria sanguinalis upto 7cm. Emergence of weeds was very poor in very acid soil but good in soil pH 5.5~6.0. However emergence of weed was not affected by pH 3.5~4.0 or above. Emergence of E. indica, C. bursa-pastoris, A. retroflexus, A. lividus, C. album, E. crus-galli, Solanum nigrum, and S. viridis was good in loam soil and P. oleranea, D. sanguinalis in sandy loam soil. Emergence of weed seeds was not affected by fertilization.