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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 26, Issue 4 - 00 2006
Volume 26, Issue 3 - 00 2006
Volume 26, Issue 2 - 00 2006
Volume 26, Issue 1 - 00 2006
Selecting the target year
Changes in Weed Population as Influenced by Different Transplanting Dates of Rice Seedlings in Paddy Field
Kim, Hyeong-Gon ; Seong, Rak-Chun ; Sim, Sang-In ; Gang, Byeong-Hwa ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 123~128
Changes in weed occurrence by shifting of transplanting date were examined to know the relationship between the growth and development of rice and altered feature of weed vegetation and density. Rice seedlings were transplanted from April 30 to June 19 with a 10-day interval in 2005. The experimental field was used for rice production for several years with reduced herbicide application under organic farming system. Total fourteen weed species were observed in the fields. Weed vegetation was consisted of two grasses, two sedges, and ten broadleaves. Major weeds were Echinochloa spp., Alopecurus aequaris, Eleocharis kuroguwai, Scirpus juncoides, Aeschynomene indica, Polygonum hydropiper, Ludwigia prostrata, Rotala indica, Bidens tripartita, Monochoria vaginalis, Sagittaria trifolia, Potamogeton distinctus, Aneilema keisak, and Lindernia procumbens. The number of occurred weeds was greater in early transplanting timings than conventional or delayed transplanting timings. Days to the maximum weed number was around 60 days in early transplanted plots, however, the duration was shortened to around 50 days by delayed transplanting. Total weed dry weight was decreased as the transplanting was delayed, however, the dry weight of Echinochloa spp., the most dominant species, was increased as the transplanting was delayed. Under delayed transplanting, phase transition from log phase to stationary phase in weed biomass was earlier than that of early or conventional transplanting. There was steady increase in weed dry weight after maximum tillering stage although the increase in weed number was slight or not noticeable.
Control of Weedy Rice in the Wet Direct Seeded Rice Paddy Field
Im, Il-Bin ; Gang, Jong-Guk ; Kim, Seon ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 129~135
This study was conducted to inquiry the occurrence characteristics and effective control system of weedy rice in the wet direct seeded rice paddy fields. The germination of weedy rice collected on soil surface burned rice straw was low less than them collected on soil exposed. The germination period of weedy rice were 13∼15 days on 15 , 7∼9 days on 20 , 5.5 days on 25∼30 . The 80% of weedy rice in soil were distributed on inside 5cm from surface. The emergence of weedy rice dropped on fall was about 91.4%. The weedy rice in wet direct seeded rice paddy field was controlled about 88∼91% on the system of non-plowing after harvest followed by irrigation on early May and non-selective herbicide application. The emergence of weedy rice in wet direct seeded rice paddy field reduced about 50∼85% on rice yield.
Variation Factors and Safening Effect of Crop Injury of Herbicide Propisochlor against Barley
Hwang, Cheol-Hwan ; Ma, Sang-Yong ; Han, Seong-Su ; No, Seok-Cho ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 136~147
This study was investigated the variation factors and the safening effect of crop injury of herbicide propisochlor against barley. Germination of naked barley (Hordeum vulgare L. cv. Saessalbori) and hulled barley (Hordeum vulgare L. cv. Olbori) and malting barley (Hordeum distichum L. cv. Sacheon 6) were inhibited 20% of untreated control at 4.0 kg ai ha-1. Naked barley and hulled barley were more sensitive to propisochlor, 4.0 kg ai ha-1, than malting barley in terms of shoot growth determined with plant height and dry weight of shoot. Rainfall at 1 day after propisochlor treatment more influenced to shoot growth of naked barley than those at 5 days after propisochlor treatment did. At 5 days after herbicide treatment, retardation of shoot growth was increased under 15 mm of rainfall than under 5 mm of rainfall. Germination of naked barley was not inhibited by 1.0 to 2.0 kg ai ha-1 of propisochlor applied under soil water content from 40 to 80%. There were no significant differences in germination or shoot growth of naked barley grown under 10, 15 and 20 after treatment of propisochlor. Germination was highly inhibited by propisochlor applied under 0 cm and 5 cm of seed-covering soil thickness than by that applied under 1 and 3 cm of seed-covering soil thickness. Growth inhibition of naked barley by propisochlor at 0.25 to 1.0 kg ai ha-1 was not reduced by combinations of methbenzthiazuron at 0.5 to 2.0 kg ai ha-1 or pendimethalin at 0.4 to 1.6 kg ai ha-1. Combinations with fenclorim at 0.5 to 3.0 kg ai ha-1 did not affect to barley inhibition by propisochlor at more than 1kg ai ha-1, but the growth retardation by propisochlor at 0.5 kg ai ha-1 was slightly recovered by combinations with fenclorim at 0.2 and 0.3 kg ai ha-1. Combinations with oxabertrinil at 0.5 to 3.0 kg ai ha-1 did not enhanced the inhibition by propisochlor at more than 0.5 kg ai ha-1.
Growth Inhibition and Re-growth of Dwarf Arrowhead by Bensulfuron-methyl
Kim, Seong-Eun ; ; Ryu, Jae-Hwan ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 148~154
Growth inhibition and re-growth of dwarf arrowhead (Sagittaria pygmaea Miq.) as affected by the application of bensulfuron-methyl were investigated in a growth chamber. Bensulfuron-methyl did not affect sprouting of dwarf arrowhead tubers. Growth of dwarf arrowhead treated with bensulfuron-methyl ceased at the 2- to 3-leaf stage and thereafter remained in a growth-ceased state. When bensulfuron-methyl was applied at 17 and 51 g ha-1, growth cessation of dwarf arrowhead lasted for 30 and 80 days, respectively. No weedy natures of the growth-ceased plant were observed. During the period of the growth cessation, photosynthetic activity as determined by 14C-assimilation decreased, whereas slight increase in respiration was observed. Tetrazolium test indicated that the tubers of the growth-ceased plants were biologically viable. After re-growth, dwarf arrowhead was capable of producing normal offshoots and new tubers. The new tuber detached from the parent plant, however, was capable of sprouting, and kept in normal growth.
Effect of Densities of Echinochlor crus-galli and Monochoria vaginalis in Wet Seeding andTransplanting Rice Cultivation on Rice Yield and Rice Quality, and Economic Threshold Levels of the Weeds
Gwon, O-Do ; Kim, Han-Yong ; Mun, Byeong-Cheol ; Guk, Yong-In ; Kim, Jong-Guk ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 155~167
This study was conducted to find the levels of reduction of rice yield and rice quality as affected by densities of Echinochloa crus-galli and Monochoria vaginalis in wet seeding and transplanting rice cultivation and to determine economic threshold levels of the weeds. In wet seeding, the yield of rice in densities (5 to 100 plants m-2) of E. crus-galli and M. vaginalis was reduced by 11 to 74% and 1 to 12%, respectively. Head rice was obviously reduced by increasing densities of occurrence of E. crus-galli, and immature rice and damaged kernel were increased with densities of occurrence of E. crus-galli. However, there were no significant differences between the quality of rice and the densities of M. vaginalis. The competitiveness of E. crus-galli was 25-fold higher than that of M. vaginalis, when regressions for prediction of rice yield loss on densities of E. crus-galli and M. vaginalis were done. Economic threshold densities of E. crus-galli and M. vaginalis calculated by Cousens' method(1985) were 0.9 and 22 per m2, respectively. This result means that the yield of rice in wet seeding can be reduced by more than the economic threshold densities of E. crus-galli and M. vaginalis. On the other hand, in transplanted rice cultivation, the yield of rice in densities of E. crus-galli (96 m-2) and M. vaginalis (576 m-2) was reduced by 60%서 언
Uptake and Photodecomposition of Paraquat on the Leaf Surface of Setaria viridis and Erigeron annuus
Sin, Seong-Hyu ; Gwon, Yong-Ung ; Park, Sang-Won ; Kim, Do-Sun ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 168~179
This study was conducted to investigate the uptake of foliar-applied 14C-ring-labelled paraquat and its photodecomposition on the leaf surface of weeds under outdoor radiation condition. During the periods of this study, UV-C, UV-B and daily total radiations were measured from 9 AM to 6 PM. Photodecomposition of the paraquat on a glass plate under outdoor radiation condition was also measured as a reference to the photodecomposition of foliar-sprayed paraquat. Erigeron annuus and Setaria viridis treated with 10 l droplets of 14C-paraquat on their leaf surfaces right after foliar spray of commercial paraquat (24.5% L) were placed under outdoor radiation condition for 20 days, and the amount of 14C-paraquat present in the leaf was measured periodically. During the periods of this study, average photoperiod was about 6 hours with 8.62 MJ m-2 of average daily radiation, 53.13 KJ m-2 of average daily UV-C, and 90.04 J m-2. Photodecomposition of the paraquat on the glass was about 80 % of the treated dose during the first 10 days and less than 6% of it was decomposed during the following 10 days. The washable paraquat by water and chloroform was about 23.8, 12.6, and 5.3% of the treated dose on the leaf surface of E. annuus, and about 30.3, 28.7, and 21.2% on the leaf surface of S. viridis, at 3, 6, and 24 hours after treatment, respectively. The paraquat was absorbed rapidly into the leaf tissue of E. annuus with its maximum of 85.9% reached at 6 hours after treatment, while it was absorbed relatively slowly with its maximum of 50.5% of the treated dose reached at 3 days after treatment. Based on the washable and absorbed paraquat, the amount of photodecomposed paraquat was estimated; 42 and 41% of the treated dosephotodecomposed until 3 days after treatment and additional 2 and 3% between 3 and 20 days after treatment in E. annuus and S. viridis, respectively.
Promotion Action of 5-Aminolevulinc Acid on Growth of Various Plant Species
An, Seol-Hwa ; Kim, Seong-Eun ; Lee, Gwan-Hwi ; Choe, Jeong-Seop ; Hwang, Gi-Jun ; Jeon, Jae-Cheol ; Jo, Gwang-Min ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 180~186
Promotion actions of 5-aminolevulinic acid (ALA) on plant growth of radish (Raphanus sativus), soybean (Glycine max), maize (Zea mays), and rice (Oryza sativa) were investigated. Fresh shoot weight of the test plants increased in ranges of 4 to 40% with relatively low concentrations (0.06 to 0.6 mM for radish, soybean, and maize; 0.06 to 0.60 M for rice) of ALA, whereas with relatively high concentrations (1.80 to 6.00 mM for radish, soybean, and maize; 60 to 600 M for rice) of ALA, the growth of the four plant species was inhibited in range of 30 to 70%. Among the four plant species, rice was the most susceptible. In rice, the root treatment of ALA affected more than the foliar treatment. The growth of rice seedlings, young roots and leaves, was promoted with 0.06 to 0.6 M of ALA application, but it was inhibited with increasing the ALA concentrations treated. When 0.1 to 1.0 mM of ALA was treated to radish, soybean, and maize, and 0.2 to 1.0 M of ALA was applied to rice, chlorophyll synthesis in the plants was improved, but no difference was found among the plant species. The ALA application in relatively low concentrations tended to inhibit the chlorophyll biosynthesis of the plants during the greening stage. In addition, when 0.6 mM (0.6 M for rice) of ALA was treated with plant nutrients to the plants, chlorophyll contents were markedly increased as comparing with ALA treated alone.
Growth Inhibiting Mode of Action of 5-Aminolevulinc Acid in Various Crops
An, Seol-Hwa ; Kim, Seong-Eun ; Lee, Jin-Ho ; Choe, Jeong-Seop ; Hwang, Gi-Jun ; Jeon, Jae-Cheol ; Jo, Gwang-Min ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 187~194
Inhibiting actions of 5-aminolevulinic acid (ALA) on plant growth of radish (Raphanus sativus), soybean (Glycine max), maize (Zea mays), and rice (Oryza sativa) were investigated. When the plants were exposed to light after treating 6.0 mM (0.6 mM for rice) of ALA, both malondialdehyde (MDA) production and electrolyte leakage from leaf disks of the plants increased. However, chlorophyll contents deceased with increasing the periods of light exposure as comparing with the untreated control. Effect of ALA treatment on accumulation of porphyrin in the plants was investigated by experiment of light exposure for 4 h after incubation in dark condition for 12 h. When 6.0 mM of ALA was treated to the plants, accumulations of Proto IX and PChlide increased as 4.0 to 20.6 and 1.4 to 2.2 times, respectively. After exposing with light for 4 h, however, Proto IX and PChlide in the plants were accumulated as 1.5 to 2.1 and 0.7 to 1.3 times, respectively, higher than those without ALA treatment. Therefore, these results indicated that treatment of ALA in the plants inhibits its growth. After treating ALA in the plants, PChlide, byproduct of prophyrin, was increasingly accumulated in the plants, and then its photodynamic action produced reactive oxygen species that increased lipid peroxidation by massive accumulation of Proto IX. The chain-reaction of lipid peroxidation resulted in destroying plant cell membranes, and also inhibited chlorophyll synthesis of the plants.
Report on the 45th Annual Meeting of the Weed Science Society of Japan
Lee, In-Yong ; ; Choe, Yong-Seok ; Im, Eun-Sang ; Yun, Cheol-Su ;
Korean Journal of Weed Science, volume 26, issue 2, 2006, Pages 195~202