Go to the main menu
Skip to content
Go to bottom
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 30, Issue 4 - Dec 2010
Volume 30, Issue 3 - Sep 2010
Volume 30, Issue 2 - Jun 2010
Volume 30, Issue 1 - Mar 2010
Selecting the target year
Isolation of a New Herbicidal Compound Angelicin from Curly Dock (Rumex crispus L.)
Cho, Nam-Kyu ; Lee, Sa-Eun ; Choi, Jung-Sup ; Hwang, Ki-Hwan ; Koo, Suk-Jin ; Wang, Hai-Ying ; Kim, Song-Mun ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 183~190
DOI : 10.5660/KJWS.2010.30.3.183
The objective of this study was to isolate a herbicidally active compound from curly dock (Rumex crispus), a native weed in Korea and to identify its` chemistry. The
value of methanol extracts which is determined by a seed bioassay using rapeseed (Brassica napus) seedlings was
. Activity-directed isolation of ethylacetate extract led to the isolation of ECDA fraction with
. Based on data of GC-MS,
-NMR, the chemical structure of ECDA was determined as 2H-furo[2,3-H]--benzopyran-2-one which is known as angelicin. The
values of angelicin to barnyardgrass (Echinochloa crus-galli), southern crabgrass (Digitaria ciliaris), and indian jointvetch (Aeschynomene indica) were 426, 66 and
, respectively. Our results suggest that angelicin could be used as a lead compound for the development of new herbicides.
Herbicidal Activity of Benzaldehyde in Cajuput (Melaleuca cajeputi) Essential Oil
Lee, Sa-Eun ; Yun, Mi-Sun ; Yeon, Bo-Ram ; Choi, Jung-Sup ; Cho, Nam-Kyu ; Hwang, Ki-Hwan ; Wang, Hai-Ying ; Kim, Song-Mun ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 191~198
DOI : 10.5660/KJWS.2010.30.3.191
The objective of this study was to find herbicidal compounds from seven different plant essential oils such as amyris (Amyris balsamifera), cajuput (Melaleuca cajeputi), geranium (Pelargonium graveolens), lavender (Lavendula spp.), mandarin (Citrus reticulata), pine (Pinus spp.) and rosemary (Rosmarius officinale), and determine their herbicidal activities. The in vitro herbicidal activity of cajuput essential oil was the highest among six essential oils (
) and major chemical components in cajuput essential oil were eucalyptol (37.2%),
-terpineol (11.6%), benzaldehyde (5.2%), linalool (4.1%),
-pinene (2.5%) and
-pinene (2.4%), and their
values were 2,731, 500, 50, 372, 4,363, and
, respectively. Soil application of cajuput essential oil and benzaldehyde did not show any herbicidal activity at 80 kg
. When cajuput essential oil was applied to foliar at 80 kg
, narrow-leaved plants such as sorghum (Sorghum bicolar), barnyardgrass (Echinochloa crus-galli), and southern crabgrass (Digitaria ciliaris) were killed 100%, however, broad-leaved plants indian jointvetch (Aeschynomeme indica), velvet leaf (Abutilon theophrasti), cocklebur (Xanthium strumarium), Japanese morningglory (Calystegia japonica) were not killed, indicating the cajuput essential oil was effective to control narrow-leaved plants. Herbicidal activities of benzaldehyde at 80 kg
, to those plants were 20, 60 and 95%, respectively. Overall data showed that the herbicidal activity of cajuput essential oil was in part due to benzaldehyde.
Selection of Essential Oils Inhibiting Germination and Initial Growth of Rapeseed (Brassica napus L.)
Choi, Sung-Hwan ; Park, Kee-Woong ; Sohn, Young-Geol ; An, Jae-Young ; Lee, Jeung-Joo ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 199~205
DOI : 10.5660/KJWS.2010.30.3.199
This study was conducted to investigate the phytotoxic effects of 19 essential oils on seed germination and initial growth of rapeseed (Brassica napus L.). We found that anise, cinnamon, citronella, clove, geranium, lemongrass, mustard and pine oils completely inhibited germination of rapeseed at
dilute solution. Based on the inhibition rates of rapeseed emergence and initial growth, three essential oils (cinnamon, clove, and geranium) were selected as potential bio-herbicides. Under pre-emergence applications of cinnamon, clove, and geranium oils at 90 kg ai
, rates of rapeseed emergence were 7.1, 25.0, and 3.6% and its initial growth were 22.0, 9.9 and 11.0%, respectively.
Influence of Moisture, pH, Depth of Burial and Submerged Conditions on Seed Germination and Seedling Emergence of Major Weed Species in Coconut Plantations of Sri Lanka
Senarathne, S.H.S. ; Sangakkara, U.R. ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 206~214
DOI : 10.5660/KJWS.2010.30.3.206
The laboratory and green house studies evaluated the effect of three different environmental factors on the seed germination, seedling emergence and survival of four major weed species in coconut plantations, Mimosa pudica, Ureana lobata, Panicum maximum and Pennisetum polystachyon. Germination percentage of all the weed species was significantly reduced with increasing soil moisture stress, no germination was observed at -0.9 MPa. Germination of both grass seeds ranged from 8% to 25% and 10% to 45% as moisture stress decreased from -0.4 MPa to 0 MPa, respectively. In contrast, seeds of M. pudica, and U. lobata were moderately tolerant to soil moisture stress and best adapted to moist environment. All the weed species seeds germinated over a wide range of soil pH values with the highest germination occurring at pH 6. In all the species, seedling emergence was declined rapidly with increasing depth with the exception of U. lobata. Seedling emergence significantly declined when the duration of flooding was three days or longer in dicotyledonous weed species and two days or longer in monocotyledonous weeds. This study illustrates the adaptability of these weeds to different environmental conditions which would enable the development of management strategies to reduce their populations below economic threshold levels in coconut plantations.
Shading Effect on Plant Growth and Physiological Activity of Youngia sonchifolia Grown in Plastic House
Chon, Sang-Uk ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 215~224
DOI : 10.5660/KJWS.2010.30.3.215
A greenhouse experiment was conducted to determine the effects of medium components and shade treatment on the growth, contents of total phenolics and flavonoids, and 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging activity of Youngia sonchifolia. Substrates combined with coco peat and perlite (ratio 70:30 or 50:50, v/v) showed higher plant length, leaf area, and fresh weight than single substrate (P<0.05). Shade treatment also significantly reduced plant height, root length, leaf areas, and fresh weight (P<0.05) with increasing of the degree. Shading treatment, however, increased contents of total phenolics [mg ferulic acid equivalents
dry wt.] and total flavonoids [mg naringin equivalents
dry wt.] in shoot parts of Y. sonchifoli, showing 110.2 to 119.2 and 128.3 to 146.7 mg
, respectively. The antioxidant potential of the methanol extracts from the plants dose-dependently increased DPPH free radical scavenging activity, and the activity was higher in shoots (50.2 to 80.8%) than in roots (47.7 to 49.8%), and in shading treatment than in no shade.
Expression Site of Protoporphyrinogen Oxidase Influences on Herbicide Resistance in Transgenic Rice
Jung, Sun-Yo ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 225~232
DOI : 10.5660/KJWS.2010.30.3.225
The effect of Protox expression site on herbicidal resistance was investigated in wild-type and transgenic rice plants imposed by peroxidizing herbicide oxyfluorfen. The transgenic rice systems involved the plastidal expression of Arabidopsis protoporphyrinogen oxidase (Protox; AP line) and the dual expression of Myxococcus xanthus Protox in chloroplasts and mitochondria (TTS line). The oxyfluorfen-treated TTS4 line showed the lower levels of cellular leakage and malonyldialdehyde and the sustained capacity of 5-aminolevulinic acid synthesis, compared to the oxyfluorfen-treated AP and wild-type lines. During oxyfluorfen action, the TTS4 line had greater herbicide resistance than the AP1 line, indicating that the dual expression of M. xanthus Protox in chloroplasts and mitochondria prevented the accumulation of photodynamic protoporphyrin IX more effectively than the expression of Arabidopsis Protox only in chloroplasts. These results suggest that the ectopic expression of Protox in mitochondria greatly contributes to the herbicidal resistance in rice plants.
Algicidal Characteristics of 1-Alkyl-3-Methylimidazolium Chloride Ionic Liquids to Several Fresh-water Algae
Hwang, Hyun-Jin ; Kim, Jae-Deog ; Choi, Jung-Sup ; Kim, Young-Wun ; Kim, Jin-Seog ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 233~242
DOI : 10.5660/KJWS.2010.30.3.233
This study was conducted to know that if ionic liquids can be applicable as control agents of harmful algae in water-ecosystem and to find out problems caused by ionic liquid application. Firstly, the differential selectivity of various fresh-water algal species to several 1-alkyl-3-methylimidazolium chloride ionic liquids was investigated. There was a distinct differential response between alkyl chain lengths from butyl to dodecyl and towards the algal organisms : Generally algicidal activity was increased with increase of chain length and among the algae used in this study, Stephanodiscus hantzschii f. tenuis, Oscillatoria tenuis and Spirulina pratensis were most sensitive to 1-dodecyl-3-methylimidazolium chloride (MAIC12), next was Microcystis aeruginosa, and the others were relatively less sensitive to the chemical. The selectivity degree was about ten to twenty times based on the
(Effective concentration required for 80% growth inhibition). Secondly, an activity persistence of ionic liquids was investigated in natural mimic condition (using water bottle containing soil-sediments under the greenhouse condition). At the application of
of 1-octyl-3-methylimidazolium chloride (MAIC8), the algal growth did not occur at all until 6 days after treatment(DAT) and observed a only little growth at 9 DAT. But the algae grew rapidly after 9 DAT. So at 20 DAT, total chlorophylls was
and the growth was inhibited by 58.2% compared to untreatment. On the other hand, MAIC12 also had a similar persistence pattern to MAIC8, showing nearly 5 times more activity than MAIC8. At 20 days after
application of MAIC12, that is, total chlorophylls was
and the growth was inhibited by 55.2% compared to untreatment. In summary, 1-alkyl-3-methylimidazolium chloride ionic liquids is likely to be applicable for selective control of harmful algae as potent compounds having long lasting activity. However, the difficulty of degradation seems to be a limiting factor in an eco-friendly application of the compounds.
Effects of Winter Cover Crop-Minor Cereal Cropping System on Weed Occurrences and Crop Growth
Kang, Myung-Hoon ; Jeon, Seung-Ho ; Lee, Se-Hun ; Yoon, Seong-Tak ; Hwang, Jae-Bok ; Kim, Seok-Hyun ; Shim, Sang-In ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 243~251
DOI : 10.5660/KJWS.2010.30.3.243
The study was conducted to evaluate the weed suppressing effects of two winter cover crops, Chinese milk vetch (CMV) and rye, in minor cereal fields in 2009. The suppressing activities of cover crops were due to the allelopathy of cover crops during weed emerging periods and competitive activity during vegetative growth of weeds. Weed suppression by cover crops were changed from 26.5 g
, 0.1 g
and 0.2 g
in control, rye field and CMV field, respectively, on June 22 to 428.6 g
, 1 g
and 403.9 g
in control, rye field and CMV field, respectively, on July 22. The weed dry weights were further changed to 656.3 g
, 607.8 g
and 511.8 g
in control, rye field and CMV field, respectively, on August 22. The suppressing effect of cover crops also observed in minor cereals. Plant height and dry weight of sorghum was reduced to 68.7% and 33.6% of handweeding, respectively, on August 5. The reduction was recovered to 82.7% and 55.6% of control, respectively, on August 26. In addition, heading date of minor cereals was delayed by 7 days with rye.
Effect of Seeding Methods to the Growing Alopecurus aequalis var. amurensis in Wheat Field of Rice-wheat Cropping System
Kim, Sun ; Ahn, Seung-Hyeon ; Im, Il-Bin ; Cheong, Young-Keun ; Kim, Si-Ju ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 252~257
DOI : 10.5660/KJWS.2010.30.3.252
The experiments were carried out to develop ecological weed control system in wheat field of rice-wheat cropping system. The results were, depression effect on water foxtail by wheat seeding method decreased the seeding after doing soil rotary by 85% compared with the no practices. The occurrence of Water foxtail was 40 piece
on October 16, 29 piece
on October 26, and 4 piece
when surveying based on the standard of seeding the wheat at 15kg
which decreased as the seeding time got later. According to the wheat seeding quantity 29 piece
occurred at 150kg
, and 8-11 piece
decreasingly at more than 200 kg
of wheat seedlings based on seeding on October 26. As a result of summarizing the above results, crushing the soil by use of rotary before seeding wheat against the end of October, and seeding by increasing the seedling quantity (200 kg
) it is judged that the competition damage by weeds including water foxtail can be reduced without any use of herbicide.
Effects of Applied of Organic-Compound Fertilizer on the Weed Control and Rice Growth Condition in the Transplanting Rice Cultivation
An, Xue-Hua ; Zhao, Xue-Ping ; Lee, Sang-Bok ; Im, Il-Bin ; An, Wen-Hao ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 258~265
DOI : 10.5660/KJWS.2010.30.3.258
The effects of organic-compound fertilizer on weed control and rice growth in the transplanting rice cultivation were researched in this article. The results showed that the growth of transplanted rice was promoted (the increased rate was 10.3~27.2%), but the plant number for Echinochloa crus-galli was controlled (the inhibition rate was 50.3~89.2%), besides, small amount of organic-compound fertilizer in controlling Aneilema keisak was highly effective when the transplanted rice was treated with 125~250 kg
organic-compound fertilizer. Moreover, E. crus-galli, Monochoria vaginalis and A. keisak were inhibited largely by increasing the water depth (1~5 cm), whereas Eleocharis kuroguwai and other sedges weeds were not effected by water depth. Compared with the temperature of
, the plant occurrence of E. crus-galli and M. vaginalis at high temperature was inhibited (the inhibition rate were 75.4~92.2% and 49.5%~81.6%, respectively). When the transplanted rice was treated with the above organic-compound fertilizer after 10day, the inhibition rate of plant occurrence for E. crus-galli and M. vaginalis was 33.7% and 23.3%, respectively. Similarly, in the later period of rice growth, the plant height and the numbers of tiller grew slowly in conventional soil in comparison with the soil treated with organic-compound fertilizer. It has been found that the rice yield in experimental soil was decreased by 4%. This result in the field experiment showed that organic material contents in conventional soil were lower than that in soil which used the organic-compound fertilizer. Weed control in experimental soil showed 60.5% lower effects than that in conventional soil.
Weeding Effect of Using Soybean Cake and Cultivating Weeder Together in Rice Bran Farming
Ahn, Seung-Hyun ; Kim, Sun ; Im, Il-Bin ; Moon, Youn-Ho ; Cha, Young-Lok ; Bark, Surn-Teh ; Koo, Bon-Cheo ; Suh, Sae-Jung ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 266~271
DOI : 10.5660/KJWS.2010.30.3.266
This study was conducted to improve weeding effect by rice bran farming technique. In the weeding effect experiment by application timing control of rice bran and soybean cake, weeding efficacy was the highest at the treatment of conventional application of rice bran. The treatment of soybean cake with rice bran was unfavorable, but Echinochloa crus-galli occurred little at the treatment of soybean cake at 5 days after transplanting, so it is thought that further study about inhibitor of early E. crus-galli occurrence in soybean cake is necessary. Cultivating weeder was effective at the treatments of rice bran and soybean cake together, of which weed occurrence was more than conventional rice bran, and precise experiments about cultivating weeding time and method will be necessary.
Effect of Various Organic Materials on Weed Control in Environment-friendly Rice Paddy Fields
Kwon, Oh-Do ; Park, Heung-Gyu ; An, Kyu-Nam ; Lee, Yeen ; Shin, Seo-Ho ; Shin, Gil-Ho ; Shin, Hae-Ryoung ; Kuk, Yong-In ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 272~281
DOI : 10.5660/KJWS.2010.30.3.272
The objective of this research was to find out the weed management techniques in environment-friendly rice paddy fields through the study on herbicidal effects and problems of various organic materials. This experiment was conducted under different conditions of weed species and weed densities in environment-friendly rice paddy fields. There was no difference in weedy efficacy on golden apple snail (GAS), paper mulching (PM), and machine weeding (MW) between low and high weed densities. However, the effect of weed control in rice bran (RB) and effective microorganism (EM) + molasses was higher in high weed density than in low weed density. In general, the effect of weed control as affected by various organic materials was in the order of GAS (97-100%) > PM (93-98%) > RB (15-80%) > EM (7-31%). GAS provided excellent control of all weed species tested except for Persicaria hydropiper. PM gave acceptable control of the weed species except for Echinochloa crus-galli, Ludwigia prostrata, and Eleocharis kuroguwai. However, MW gave fair control (70% biomass reduction) of all weed species tested. BR followed by MW or EM followed by MW treatments had similar effect on weed control compared to each treatment alone. However, BR followed by GAS or EM followed by GAS provided 100% control of weed species tested. The level of rice foliar injury caused by various organic materials was in the order of GAS and MW (10-20%) > RB (10-15%) > PM and EM (5-7%). Typical symptoms of organic materials are wilting, inhibition of growth, missing hill, and reduction of tiller. Cost for weed control of GAS, RB, EM, and PM were 2.1, 3.1, 2.3, and 13.2 times higher than that of the herbicide. These data indicate that GAS was the best method for weed management in environmentfriendly rice paddy fields. Further study is required to elucidate the mechanisms underlying the rice injury as affected by GAS.
Weedy Control Efficacy and Injury of Rice Plant by Golden Apple Snail(Pomacea canaliculata) in Environment-friendly Rice Paddy Fields
Kwon, Oh-Do ; Park, Heung-Gyu ; An, Kyu-Nam ; Lee, Yeen ; Shin, Seo-Ho ; Shin, Gil-Ho ; Shin, Hae-Ryoung ; Kuk, Yong-In ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 282~290
DOI : 10.5660/KJWS.2010.30.3.282
The objective of this research was to discover the best method for weed management in environment-friendly rice paddy fields through the study on the effect of weed control and injury levels of rice plants as affected by size, input time, and input amount of golden apple snail (GAS). The efficacy of weed control as affected by GAS when applied at 5, 10, and 15 days after transplanting (DAT) was 98, 89, and 58%, respectively. The efficacy of weed control had declined as late the input time of GAS. On the other hand, the efficacy of weed control as affected by rice bran followed by GAS treatment was higher than by GAS treatment alone. Weed species such as Persicaria hydropiper, Echinochloa crus-galli, Scirpus juncoides, and Monochoria vaginalis were not completely controlled by GAS when applied late. Input amount and time of adult GAS (70 days after hatching) for effective weed control were 3 kg
at 5 DAT, 6-7 kg
at 10 DAT, and 7 kg
at 15 DAT. Input time and amount of young GAS (35 days after hatching) for effective weed control were 0 day after harrow (DAH) and 1 kg
, respectively. The young GAS when applied 0 DAH at 1 kg
provided 100% control of P. hydropiper, E. crus-galli, S. juncoides, M. vaginalis, Ludwigia prostrata, Eleocharis kuroguwai, Sagittaria trifolia and Cyperus difformis. The rice foliar injury caused by adult (3 kg
) and young (1 kg
) GAS were 5-7% and 1% respectively. There was no significant difference in rice injury by size and input amount of GAS on plant height and number of tiller. These data indicate that the young GAS when applied 1 kg
at 0 day after harrow was the best method for weed management in environment-friendly rice paddy fields.
Response of the Resistant Biotype of Echinochloa oryzoides to ACCase and ALS inhibitors, and Effect of Alternative Herbicides
Park, Tae-Seon ; Ku, Bon-Il ; Kang, Sin-Koo ; Choi, Min-Kyu ; Park, Hong-Kyu ; Lee, Kyong-Bo ; Ko, Jae-Kwon ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 291~299
DOI : 10.5660/KJWS.2010.30.3.291
Cyhalofop-butyl and penoxsulam, known for respective acetyl CoA carboxylase (ACCase) and acetolactate synthase (ALS) inhibitor, have been widely using as a post-emergence foliar application for many years in wet-seeded rice field in Korea. Since 2009, control of Echinochloa oryzoides with cyhalofop-butyl and penoxsulam was no longer satisfactory. Greenhouse and experiment in rice field were conducted to confirm E. oryzoides resistance to ACCase and ALS inhibitors and to compare herbicide treatments for control of the resistant E. oryzoides to ACCase and ALS inhibitors. Three resistant E. oryzoides to ACCase and ALS inhibitors accessions were tested for levels of resistance to cyhalofop-butyl and penoxsulam, base on survival rate. Iksan and Kimje accessions were not any affected to the survival by treatment with recommended doses of two herbicides tested. Buan accession displayed an intermediate response of 62 and 72% survival at recommended doses of cyhalofop-butyl and penoxsulam, respectively. Survival rates to herbicides mixed with ACCase and ALS inhibitors at 3.5 leaf stage of E. oryzoides was over 80%. Benzobicyclon+fentrazamide+bensulfuron SC, benzobicyclon+mefenacet+bensulfuron SC, benzobicyclone +cafenstrole+pyrazosulfuron-ethyl GR controlled effectively by 2 leaf stage of resistant E. oryzoides to ACCase and ALS inhibitors. In the field experiment, single treatment of benzobicyclon+ fentrazamide+bensulfuron SC and benzobicyclon+mefenacet+bensulfuron SC failed to control E. oryzoides, but squential treatment of benzobicyclon+thiobencarb SE and benzobicyclon+ mefenacet+ bensulfuron SC controlled effectively it in rice infant seedling culture with machine. Our results suggest that resistant E. oryzoides to ACCase and ALS inhibitors had not developed multiple resistance to herbicides with different modes of action. In particular, cafenstrole, fentrazamide, mefenacet were effective control measures.
Differential Tolerance of Rice Cultivars to Mesotrione-Contained Herbicides
Kim, Sang-Yeol ; Lee, Ji-Yoon ; Yeo, Un-Sang ; Oh, Seong-Hwan ; Park, Sung-Tae ; Lee, Jong-Hee ; Jeong, Kuk-Hyun ; Cho, Jun-Hyeon ; Song, You-Chun ; Kang, Hang-Won ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 300~307
DOI : 10.5660/KJWS.2010.30.3.300
Greenhouse experiment was conducted to evaluate tolerance of six rice cultivars, three Indica
Japonica rice (long grain, cv. Dasanbyeo, Segejinmi and Hanareumbyeo) and three Japonica rice (short grain, Nampyung, Ilpumbyeo and Junamjosaeng) cultivars, to mesotrione+pretilachlor (MP) and bensulfuron-methyl+mesotrione+pretilachlor+pyriftalid (BMPP) in transplanting rice. Two herbicides were applied at 90 g and 180 g a.i.
to three to four leaf stage rice at 5 and 15 days after transplanting, respectively. Related study was also conducted to compare
Japonica and Japonica rice cultivars at different MP rates. Response to two herbicides varied with respect to rice cultivars and herbicide rates. All Indica
Japonica rice cultivars exhibited susceptible to both MP and BMPP as reflected by increased visual injury, shorter plant height and higher plant dry matter reduction when compared with nontreated rice cutlivars. The degree of foliar chlorosis by MP at 90 g a.i.
was 5~6 at 7 days after treatment(DAT) but it was decreased to 3~6 at 14DAT. The degree of leaf chlorosis treated with 180 g a.i.
MP was 6~7 at 7DAT and it was also decreased to 3~8 at 14 DAT. The plant hight of Indica
Japonica rices was inhibited by 18~43% at application of 90 g a.i.
MP and 30~50% at 180 g a.i.
MP. The dry matter reduction was greater than that of plant height inhibition, showing 46~73% at 90 g a.i.
MP and 65~82% at 180 g a.i.
MP. Similar leaf chlorosis injury and growth inhibition of rice cultivars was observed in the BMPP treatment. The injury and growth inhibition by MP and BMPP increased with increase in herbicide rate from 90 g a.i.
to 180 g a.i.
. However, most of the Japonica cultivars are tolerant to MP and BMPP at both rates. There was no visible leaf chlorosis but plant height and dry matter production were slightly reduced at 180 g a.i.
. Based on
value determined in reduction of shoot dry weight for MP, the Indica
Japonica rice showed 12.9 fold lower compared with the Japonica rice. The result indicates that rice cultivars vary in tolerance to herbicides of MP and BMPP and Indica
Japonica rices were more susceptible than the Japonica rices to the MP and BMPP.
Suggestion of Abbreviation for Korean Weeds Name
Lee, In-Yong ; Kim, Chang-Seog ; Moon, Byung-Chul ; Park, Jae-Eup ; Oh, Se-Mun ;
Korean Journal of Weed Science, volume 30, issue 3, 2010, Pages 308~321
DOI : 10.5660/KJWS.2010.30.3.308
To increase of weed researches, abbreviations for Korean weeds name(tentatively named `KSWS code`, the Korean Society Weed Science code) of 433 species belonging to 68 families in arable land were suggested in this paper. The KSWS code was derived from Bayer code or/and modified. The KSWS code was composed of alphabetic 5 characters, namely 3 characters in generic name and 2 characters in specific name. And variable species`s KSWS code was 1 characters in generic name and 1 characters in variable name.