• Korean Journal of Weed Science
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• v.31 no.4
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• pp.368-374
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• 2011

This experiment was conducted to Investigate the herbicidal activity of naturally developed d-Limonene on the control of Sicyos angulatus L. which is destructive to biodiversity and ecosystem under greenhouse and open field condition. Among the tested concentrations, most efficacy of early foliar application(leaf stage with 1.5 and 3) of d-Limonene was found in $70mg\;mL^{-1}$, followed by $35mg\;mL^{-1}$, $17.5mg\;mL^{-1}$ in that order under greenhouse condition. The higher the d-Limonene concentration, the better the effect in greenhouse condition. In leaf stage with 2, 3 and 5 under open field condition, the higher the d-Limonene concentrations, the higher the weeding effect. The remarkable effect was, particularly, found in d-Limonene with $70mg\;mL^{-1}$ while little was found in the plants with d-Limonene with $35mg\;mL^{-1}$. In the case of 15 leaf stage of S. angulatus L. treated with d-Limonene under outside treatment effect was low. The treatment effect of d-Limonene under open field compared with greenhouse condition was more significant. It can be recommended that d-Limonene with $70mg\;mL^{-1}$ could control S. angulatus L. by 5 leaf stage.

• Weed & Turfgrass Science
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• v.3 no.4
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• pp.362-369
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• 2014

A developed slurry composting and biofiltration (DSCB) liquid fertilizer could be used for eco-friendly turfgrass management in golf course. This study was conducted to evaluate the growth effect of application intervals of DSCB in Kentucky bluegrass based on turf color index, chlorophyll index, clipping yield and uptake and availability of nutrient. Treatments were designed as follows; non-fertilizer (NF), control (CF) and DSCB treatments which were applied a every 15 days (DSCB), every 30 days (2DSCB) and 60 days (4DSCB-1: April, June, August; 4DSCB-2: May, July, September). Turf color indexes of DSCB and 2DSCB were higher than CF, but these chlorophyll indexes similar to CF. The clipping yield and uptake and availability rate of nitrogen and potassium in turfgrass were increased in 2DSCB. These results suggested that application of DSCB improved turf quality and growth by prompting an uptake and availability of nutrients in Kentucky bluegrass and its application interval was 1time per month.

• Korean Journal of Environmental Agriculture
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• v.12 no.2
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• pp.193-207
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• 1993

The seed dormancy of weed species is the important mechanisms to unfavorable conditions but it brings about critical problems in weed control. The factors which induced dormancy were varied with species and their physiological conditions. More than 20 of 50 species of dominant weed species showed the seed dormancy. When several physical treatments were given to seeds to break the dormancy, each species showed the different responses. The germination percentage and germination velocity were increased with alternating temperature. The treatment of more than 4 weeks of stratification had strong effect on dormancy breaking. The ${\alpha}-amylase$ activities of germinating seeds were increased in proportional to the period of stratification treatment of dormant seeds. The contents of soluble protein and soluble sugar were changed slightly with stratification.

• Korean Journal of Weed Science
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• v.15 no.4
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• pp.298-304
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• 1995

This study was carried out to make the most of them as the fundamental data for reasonable weed control when population of weeds was observed in the alternated fields of lowland and upland. The annual and the perennial paddy weeds in the continuous paddy rice field remarkably decreased when compared to that in the alternated field of paddy rice and soybean. The longer was the duration of upland field condition, the less was the population of lowland weeds and the more was the population of upland weeds. Biennial weeds in the contiuous paddy rice field were less than that in the rotated field of paddy rice and soybean, and this tendency was clear in Alopecurus aequalis Sobol. In the continuous cropping of paddy rice, population of biennial weeds in the culverted field was higher than that in the unculverted one, but in the continuous cropping of soybean this tendency was vice versa.

• Korean Journal of Weed Science
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• v.14 no.4
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• pp.272-279
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• 1994

In order to compare the biological properties of benfuresate and cinosulfuron as herbicides for the chemical control of Eleocharis kuroguwai, some experiments were conducted at greenhouse and field conditions in 1993. Benfuresate and cinosufuron moved to 2cm and 6cm deep in paddy soil and inhibited the growth of E. kuroguwai. Benfuresate was absorbed into the roots of E. kuroguwai. whereas cinosulfuron was absorbed into not only the roots and shoots but also the mesocotyls. After the emergence was inhibited by the soil application of herbicides, the percentage of regrowing numbers was higher at cinosulfuron than at benfuresate, whereas the growth rate was higher at benfuresate on the contrary. Benfuresate brought about complete death of buds as a killing type, but cinosulfuron produced lots of abnormal shoots as an inhibiting type. Benfuresate was able to apply on soil surface from the preemergence to the early stage of 2cm high, but cinosulfuron was able to use from the preemergence to the stage of 15cm high. The foliar application of cinosulfuron showed a good control effect, but it induced a severe phytotoxicity to rice. A good control effect of Benfuresate/bensulfuron GR lowered at the late stage, but that of cinosulfuron/mefenacet/dymron GR at the early stage maintained until the late stage of 65 days after transplanting.

• Korean Journal of Weed Science
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• v.4 no.2
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• pp.163-168
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• 1984

This study was conducted to find out the effect of paclobutrazol 0.6G and flurprimido 50wp application at 40 days before heading on the characters related with lodging and the growth and yield of paddy rice plants in 1983. The culm length were shortened by paclobutrazol and flurprimido applications and high level of suppression was observed in the 3rd to 5th internodes. Paclobutrazol caused thiner internode and thicker wall of internode than the untreated control, however flurprimido caused thicker wall of internode without change of internode diameter. The breaking weight of lower internode was higher by flurprimido application than those by the untreated control and paclobutrazol application. The lodging indexes effected by both chemicals were remarkably decreased, and also the field lodging was not observed. The leaf area indexes effected by paclobutrazol and flurprimido applications were increased because of the increasing of tillers and green leaves per stem in spite of shortening of lead blades. Paclobutrazol and flurprimido application out-yielded significantly the untreated control lodged at grain filling stage. However in conditions of untreated with no lodging, the yields of these treatments were significantly less than that of untreated control.

• Journal of The Korean Society of Grassland and Forage Science
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• v.11 no.2
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• pp.46-46
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• 1991

Adequate regrowth control of weeds and shrubs has been one of the important problem for pasture establishment by overseeding on reclaimed forest hilly land. This experiment was carried out on sloping shrub land near Anseong, Gyeonggido to evaluate the effects of herbicide application on growth control of native weeds, shrubs and trees. We evaluated 63 different weeds and wood species in the trials, which are grown common in korean forest. Buthidazol and 4 other herbicides (sodium chlorate, glyphosate, U-46 and gramoxone) were sprayed each at two application rates during the period of the most intensive growth, on 20 July 45 days before overseeding of pasture species. Glyphosate and sodium chlorate gave excellant control of growth of all species. However. Uncus effusus, Carex heterostachya, Polygonatum humile, Rubus corchorifolius, Lonicera coeralea and Rhododendron mucronulatum were classified as a tolerant weed and wood species to herbicides. Herbicide buthidazol showed also successive control of regrowth of weeds and wood species. But buthidazol was evaluated as a none available herbicide for use in pasture establishment. because o! their long persist of toxic herbicide residue in soils after treatments. Herbicide U-46 and gramoxone had almost no effect on regrowth of shrubs and tree species

• Journal of The Korean Society of Grassland and Forage Science
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• v.11 no.2
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• pp.76-83
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• 1991

Adequate regrowth control of weeds and shrubs has been one of the important problem for pasture establishment by overseeding on reclaimed forest hilly land. This experiment was carried out on sloping shrub land near Anseong, Gyeonggido to evaluate the effects of herbicide application on growth control of native weeds, shrubs and trees. We evaluated 63 different weeds and wood species in the trials, which are grown common in korean forest. Buthidazol and 4 other herbicides (sodium chlorate, glyphosate, U-46 and gramoxone) were sprayed each at two application rates during the period of the most intensive growth, on 20 July 45 days before overseeding of pasture species. Glyphosate and sodium chlorate gave excellant control of growth of all species. However. Juncus effusus, Carex heterostachya, Polygonatum humile, Rubus corchorifolius, Lonicera coeralea and Rhododendron mucronulatum were classified as a tolerant weed and wood species to herbicides. Herbicide buthidazol showed also successive control of regrowth of weeds and wood species. But buthidazol was evaluated as a none available herbicide for use in pasture establishment. because o! their long persist of toxic herbicide residue in soils after treatments. Herbicide 1:-46 and gramoxone had almost no effect on regrowth of shrubs and tree species.

• Journal of The Korean Society of Grassland and Forage Science
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• v.17 no.4
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• pp.357-362
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• 1997

This study was carried out to investigate the effects of herbicide treatment and seeding method on the forage yield, weed control, and persistency in the Artemisia princeps dominated pasture. It was arranged as a randomized block design with seven treatments(\circled1 oversowing(control),\circled2 glyphosate 4 ${\ell}$/ha + oveysowing a \circled3glyphosate 4 ${\ell}$/ha + chiselreseeding, \circled4 paraquat dichloride 3 ${\ell}$/ha + oversowing,\circled5 paraquat dichloride 3 ${\ell}$/ha + chiselreseeding, \circled6 dicamba 4 ${\ell}$/ha + oversowing and \circled7 dicamba 4 ${\ell}$/ha + chiselreseeding), and conducted at National Livestock Research Institute in Suwon from June, 1985 to October, 1987. In the Artemisia princeps dominated pasture, the treatments of glyphosate 4 ${\ell}$/ha before oversowipg or chisel reseeding controlled 80.7-83.3% of the Artemisia princeps, and for two years the average dry weight of Artemisiaprinceps greatly decreased, but dry matter(DM) yield of forage increased 57-96% than that pf control. In the herbicide treatments, the average DM yield of forage in the plots with chisel r e d i n g was significantly higher when compared to oversowing. The results in this study indicated that herbicide treatment was effective for the control of Artemisiaprinceps, and good renovation of grassland and higher DM yield of forage could be obtained by application of glyphosate.

• Korean Journal of Weed Science
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• v.9 no.2
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• pp.90-96
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• 1989

This experiments were conducted to investigate the effect of plant growth regulator treatments on the ethylene evolution in soybean sprouts. Major results can be summarized as follows. 1. IAA showed no significant effect on the ethylene evolution in soybean sprouts. 2. BA increased significantly ethylene evolution while kinetin, zeatin, zeatin riboside were less effective on the ethylene production in soybean sprouts. 3. As the BA concentration was increased, the ethylene evolution was increased. 4. BA increased ethylene production more effectively at earlier stages while 4PU-30 was more effective for ethylene production rather continuously. 5. The order of effectiveness of cytokinins and auxin on the ethylene evolution was as follows : BA 25 ppm>BA 25ppm+IAA 25ppm${\geq}$4PU-30 25ppm>IAA 25ppm>control. 6. It can be concluded that BA was the most effective in inhibiting lateral roots, among the cytokinins tested, and resulted in the biggest diameter of hypocotyl by the ethylene evolution stimulated by BA treatment.