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 13, Issue 4 - Dec 1993
Volume 13, Issue 2 - Jun 1993
Volume 13, Issue 1 - Mar 1993
Selecting the target year
Absorption, Translocation and Metabolism of Bensulfuron in Rice and Cyperus serotinus Rottb.
Kwon, C.S. ; Pyon, J.Y. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 75~80
Root absorption, translocation and metabolism studies of
-bensulfuron in rice and Cyperus serotinus Rottb. were conducted to determine their selective mode of action. Rice absorbed a greater amount of bensulfron than Cyperus serotinus. The translocation rates of bensulfuron from roots into shoots were much faster in Cyperus serotinus than rice plants. The metabolic rate of bensulfuron was very fast in rice plants, but slow in Cyperus serotinus and therefore, the amount of parent bensulfuron remained in the shoots after 12 hours absorption was greater in Cyperus serotinus than rice. In conclusion, this studies indicated that Cyperus serotinus was susceptible to bensulfuron because of the slower metabolic rate and fast translocation rate, but tolerance of rice might be caused by faster metabolic rate in plants.
Biorational Screening System Using Cyanobacteria(Anacystis nidulans
) for Searching the Photosynthetic Electron Transport Inhibitors
Hwang, I.T. ; Hong, K.S. ; Cho, K.Y. ; Yoshida, S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 81~88
For searching the photosynthetic electron transport(PET) inhibitors, bio-rational screening system using thylakoid membranes extracted from wild and mutant cyanobacteria(Anacystis nidulans
) was developed. Generally, thylakoid membrane was more sensitive to the tested herbicides than the chloroplast from spinach in the Hill reaction. Higher resistant characteristics appeared in mutant D-5, Di-22 to diuron and mutant G-264 to atrazine as compared to wild type. To test the reaction of thylakoid membrane to herbicides, diuron and atrazine were applied simultaneously. Diuron and atrazine competed each other for binding with substituted amino acids, while diuron and dinoseb were non-competitive, and inhibiting activity was increased. Conclusively, bio-rational screening system using cyanobacteria was proved to be fast and efficient screening method for the development of PET inhibitors.
The Effect of Newly Synthesized Compounds on the Photosynthetic Electron Transport of Cyanobacteria (Anacystis nidulans
Hwang, I.T. ; Kim, J.S. ; Cho, K.Y. ; Yoneyama, K. ; Yoshida, S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 89~95
The Inhibiting activity of newly synthesized phenol (E-series) and triazine (T-series) derivatives was evaluated by using thylakoid membranes extracted from cyanobacteria (Anacystis nidulans
). There were no significant differences between phenol derivatives and dinoseb to the thylakoid membrane extracted from wild type in the Hill reaction. However, a phenol derivative, E-24 which has no -Cl at phenyl ring, did not show any activity. The longer the length of R substituents was in phenol derivatives, the lower inhibiting activity was in the Hill reaction. Triazine derivatives, T-27, T-28, T-40, T-41, T-47 and T-48 were also compared with diuron and atrazine. Among triazine compounds, T-27 and T-28 showed 10 and 30 times activity as high as atrazine to wild type, respectively. Other triazine derivatives, T-40, T-41, T-47 and T-48 showed low inhibiting activity to wild and mutant type. A structural difference of T-27 and T-28 from T-40, T-41, T-47 and T-48 was the presented of -C-NH-. Both T-27 and T-28 were very closely associated with serine, an amino acid located at the 264th position of D1 protein because of the resistant ratio(R/S) to mutant G-264 were higher than that of atrazine.
Fresh-water Algae Occurred in Paddy Rice Fields - VI. Ecology of Suspensible Green Algae and Soil-flakes and Their Chemical Control
Lee, H.K. ; Park, J.E. ; Ryu, G.H. ; Lee, J.O. ; Park, Y.S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 96~103
The experiments on the ecological characteristics of the suspensible green algae and the algae causing soil-flakes and shier chemical control were conducted in 1992. The unicellular green algae which were dominated by Chlamydomonas sp. largely occurred when phosphorus was applied, but which were reduced by nitrogen application. The filamentous green algae which were dominated by Klebsormidium sp. largely occurred when phosphorus was applied, and which much more increased when nitrogen or potassium was combined with phosphorus. The suspensible green algae which were dominated by Klebsormidium sp. were controlled by 60-70% when simazine 10g ai/10a and propanil 105g ai/10a were applied. The dark blue soil-flakes largely occurred at nitrogen application, and which much more increased when nitrogen was combined with phosphorus. The dark brown soil-flakes largely occurred at phosphorus application, but no more increased even if nitrogen or potassium was combined with phosphorus. The dark blue soil-flakes which were dominated by Oscillatoria sp. much more increased at the temperature conditions of
. The applications of bensulfuron/mefenacet/dymron, piperophos/dimethametryn and bensulfuron/dimepiperate controlled 70-90% of the dark blue soil-flakes.
Prediction Model of Weed Population in Paddy Fields - I. Practical Approach to Development of Prediction Model
Lee, H.K. ; Lee, I.Y. ; Ryu, G.H. ; Lee, J.O. ; Park, Y.S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 104~113
The experiment was conducted in 1992 to find out the approach to the development of prediction model of weed population in paddy fields. The weed seeds of 88% over were separated from the soil by using
50% solution with specific gravity 1.34. The weed seeds which were floated on the solution due to the difference of specific gravity between soil particles and the seeds were effectively withdrawn by using a vaccum pump attached with an aspirator. The seeds withdrawn together with solution were taken by filtering with a nylon net of
mesh. The pressing method was more efficient and practical for the viability test of weed seeds separated from the soil compared with the germination test and the TTC test. For the prediction of weed population by the number of weed seedlings emerged at the sampled soil, the sampling method of 0-10cm deep at 5-6 sites per field was applicable. At the prediction method by the number of seedlings emerged, the smaller the seed sizes, the lower the prediction coefficients of weed species. It was considered that the prediction method by the number of seedlings emerged was more practical than the prediction method by the number of seeds separated from sampled soil, in relation to similarities to weed population, time and expenses required for examining, technical difficulties and applicability of weed species.
Weed Occurrence and Competitive Characteristic under Different Cultivation types of Rice(Oyriza sativa L.) - 3. Difference in Weed Occurrence and Rice Growth Under the Competitive Periods
Im, I.B. ; Guh, J.O. ; Oh, Y.J. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 114~121
Differences in need occurrence and competition were investigated among five types of rice(Oryza sativa L.) cultivation. Dry weights of weeds in between transplanting and/or seeding and heading date showed in the decreasing order of dry direct-seeded, flood direct-seeded, machine transplanting with 10-day-old seedling, machine transplanting with 30-day-old seedling, and conventional hand transplanting. A similar trend was obtained with application of weedy followed by weed-free. Weed-free periods allowed to decrease by 20% dry weight of rice were 3 weeks after transplanting(WAT) in transplanting cultivations, 5 weeks after seeding(WAS) in wet direct-seeded rice, and 7-8 WAS in dry direct-seeded rice. On the other hand, weedy periods as determined by the same criterion were 9 WAT in conventional hand transplanting and machine transplanting with 30-day-old seedling, 7 WAT in machine transplanting with 10-day-old seedling, 8 WAS in dry direct-seeded rice, and 6 WAS in flood direct-seeded rice.
Weed Occurrence and Competitive Characteristic under Different Cultivation types of Rice(Oyriza sativa L.) - 4. Differences in Competitive Characteristics for Mineral Nutrition
Im, I.B. ; Guh, J.O. ; Chun, J.C. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 122~131
Differences in competitive characteristics for mineral nutrition were compared with rice and weeds according to rice planting types like the traditional hand transplanting, machine transplanting of young(10days old) and mature(30days old) seedling, flood direct seeding of germinated seeds and dry direct seeding of dry seeds. There was a slight competition for such nutrients as N, P, K, Ca, and Mg by E. crus-galli and E. kuroguwai in transplanting cultivations. However, nutrient uptake by rice in direct-seedings was severely inhibited throughout the whole growth period by the two weeds including annual weeds such as S. Juncoides and C. difformis. The competition for nutrients at different cultivation types was mainly governed by the dominant weeds.
Some Biological Characteristics of Tuber Formation in Eleocharis kuroguwai
Shin, H.S. ; Chun, J.C. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 132~137
Some biological characteristics with respect to tuber formation of Eleocharis kuroguwai Ohwi were investigated. Tuber formation was initiated at the descending time of daily maximum and minimum temperatures, accelerated under the minimum temperature lower than
, and terminated at about
. Tubers produced at the early season were located at deeper soil layers. Large tubers were found at deeper soil depths and required the longer period for sprouting as compared with small tubers. Percent emergence decreased as the emergence depth increased, while percent old-tuber produced during previous years was greater at the deeper depths.
Reproductive Growth and Competitive Ecology of Arrowhead(Sagittaria trifolia L.) - 1. Growth and Tuber Formation of Arrowhead under Several Environmental Factors
Han, S.S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 138~150
Experiments were carried out to understand how much do the environmental factors affect growth and tuber formation of arrowhead, Sagittaria trifolia L. The more the light transmittance decreased, the more the numbers of leaves and floral axes decreased. The dry matter weight of tops and the number and the fresh weight of formated tuber were significantly different between the light transmittance of more than 50% and that of less than 30% at the 5% level of DMRT. Plant height, number and width of leaves, and number of floral axis were affected by the Light spectra. And the degree of their effects on growth of arrowhead was different form the light spectrum. The natural light and the clear cellophane film were the most effective to increase the number and the fresh weight of formated tuber and the green spectrum was the least effective to do those. Plant height grown at 0-5cm water depth was shorter than that at 10-20cm water depth. The deeper the water depth was, the lower the leaves number was. The fresh weight and the number of arrowhead tuber were most produced at 0cm water depth and theose were least at 20cm water depth. The shoot growth and the tuber formation of arrowhead was much increased with increase of the application rate of fertilizer. The difference of the transplanted tuber size was not affected at the shoot growth, but tuber formation of arrowhead was increased with increase of the transplanted tuber size. From viewing the effect of temperature after rice heading, the shoot growth and the tuber formation at
were also higher than those at
Reproductive Growth and Competitive Ecology of Arrowhead (Sagittaria trifolia L.) - 2. Competition Ecology of Arrowhead
Han, S.S. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 151~158
This experiment was conducted in order to understand the intra-and the inter-competition of arrowhead, Sagittaria trifolia L., under the conditions of arrowhead monoculture and rice-mixed culture, respectively. In arrowhead monoculture, the infra-specific competition in both shoot length and floral axis number began at 10 plants per
and that in leaf number, leaf length, dry shoot weight and formated tuber number did at 5 plants per
. In the inter-specific competition according to arrowhead density in the constant rice-mixed culture, the plant height and the tiller number of rice decreased at 15 and 5 plants of arrowhead per
, respectively. The dry top weight and the formated tuber number of arrowhead decreased with increase of arrowhead density. In the inter-competition according to rice plant density in the constant arrowhead-mixed stands, the dry matter weight and the produced tuber number of arrowhead decreased with increase of rice plant density and the plant height and the tiller number of rice also did with that. In the different transplantation time of rice, the growth in arrowhead became less in order of late transplantation>standard one>early one and the plant height and the tiller number of rice became more in order of that by comparing the percentage of growth under the mixed culture to that under the arrowhead monoculture.
Changes of Weed Flora Under Direct Seeded Rice Cultivation in Dry Paddy Field
Ku, Y.C. ; Park, K.H. ; Oh, Y.J. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 159~163
This research was conducted at the Crop Experiment Station to determine the changes of weed flora under direct seeded rice cultivation in dry paddy field from 1989 to 1992 and to establish an effective weed control strategy in direct seeded rice cultivation. With the continuous rice growing under direct seeded rice cultivation in dry paddy field, there were more occurrence in grasses and annual weeds while broadleaf and perennial weeds were diminished. The predominant weeds were aquatic weeds such as Eleocharis kuroguwai, Echinochloa crusgalli, and Monochoria vaginalis in machine transplanted rice paddy field while there were predominant of semi aquatic weed species such as E. crusgalli, Digitaria sanguinalis, Bidens tripartita, Aeschynomene indica, and Arthraxon hispidus in continuous direct seeded rice cultivation in dry paddy condition. Based on the vegetative analysis of weeds in terms of simpson index and community dominance, there was more distribution of weed species in direct seeded rice cultivation on dry paddy condition while only distributed with 1-2 weed species in machine transplanted rice paddy field. In similarity coefficient, there was a gradual increase up to 67% of weeds with the continuous direct seeded rice cultivation in dry paddy condition for 4 years starting from 41% of similarity coefficient.
Weeds Identified in the Buryingplaces of the Kyungpook Probince
Kim, K.U. ; Shin, D.H. ; Kwon, S.T. ; Park, S.J. ; Lee, S.J. ;
Korean Journal of Weed Science, volume 13, issue 2, 1993, Pages 164~172
About 196 weed species composed of 31 annuals, 38 biennials and 127 perennials belonging to 53 families were identified from 90 buryingplaces in Kyungpook province on June and September, 1992. Compositae was the most widely occuring family covering 34 species, followed by 27 species in graminae, 17 species in leguminosae, and 10 species in rosaceae, 8 species in liliaceae ranunculaceae, 7 species in caryophyllaceae cruciferae, 6 species in labiate polygonaceae, 4 species in crassulaceae cyperaceae, and the rest 41 families having 1 to 3 species. The dominant weed species occured in the buryingplaces based on importance value and frequency were Imperata cylindrica, Artemisia princeps, Viola mandchrica, Erigeron annuus, Erigron canadensis, Rubus parvifolius and Prunella vulgaris.