• 아시안잔디학회지
• /
• 제20권2호
• /
• pp.213-221
• /
• 2006

본 연구는 토양 수분함량을 즉시 파악할 수 있는 Time Domain Radiometer(TDR)과 식물의 광합성 시 잎에서 반사되는 Reflectance를 통하여 식물의 상태를 파악할 수 있는 Multi-spectral radiometer(MSR)를 사용하여 난지형 잔디인 'Sea Isle 1' Seashore paspalum 과 'Floratam' St. Augustinegrass를 대상으로 토양수분함량과 Reflectance와의 상관관계를 파악하고자 시작하였다. 본 연구를 통해 토양 수분함량이 660, 694 wavelengths와 NDVI, LAI, stress index에서 높은 상관관계를 가지고 있음을 알 수 있었다. 이는 Sensor-based technology가 잔디의 수분요구 시점을 미리 파악할 수 있는 기술의 기초 자료로서 활용될 수 있으며 여러 다른 Sensor-based technology를 이용한 연구로 확대될 수 있을 것이다.

• 아시안잔디학회지
• /
• 제14권1호
• /
• pp.251-256
• /
• 2000

The purpose of this study is to select the appropriate herbicide, which is needed to control the bentgrass in kentucky bluegrass(Poa pratensis) fairway effectively. The best control of bentgrass was observed at /$0.3mL\m^2$ of dithiopyr applied on Kentucky bluegrass. A field experiment was conducted to determine the priming effects on seed germination of Kentucky bluegrass. Ground covering rates by turfgrass were investigated under field conditions for 70 treatments by thirty days after treatment. The solid matrix priming(SMP) treatments on Kentucky bluegrass reduced the number of days requited for emergence and improved final cover ratings. Primed seeds of Kentucky bluegrass (incubated for five days at $20^{\circ}C$) resulted in most rapid germination and covering rate.

• 아시안잔디학회지
• /
• 제15권1호
• /
• pp.9-14
• /
• 2001

Callus formation and plant regeneration from the seeds of zoysiagrass cv. Zenith was tested on MS basal medium supplemented with various concentrations of 2,4-dichlorophenoxyacetic acid(2,4-D) and of several cytokinins. A concentration of 1mg/L 2,4-D on medium stimulated callus formation. In the presence of 5mg/L 2,4-D, addition of 1mg/L kinetin significantly enhanced callus formation and plant regeneration over 2,4-D alone. To transfer foreign DNA into turfgrass, parameters for the bombardment of embryogenic callus with the particle bombardment were partially optimized using transient expression assay of a $chimeric \beta$-glucuronidase(GUS) gene driven by the CaMV 35S promoter. GUS gene was strongly expressed at helium pressure 1,100 psi and 6~9cm target distance.

• 식물병과 농업
• /
• 제1권1호
• /
• pp.19-29
• /
• 1995

A microbial product composed of three antagonistic fungal isolates (Aspergillus sp., Penicillium sp. and Trichoderma sp.) and three bacterial isolates (Arthrobacter sp., Bacillus sp., and Pseudomonas sp.) was tested for the control of Pythium blight caused by Pythium sp., brown patch by Rhizoctonia solani (anastomosis group(AG) 1-1) and large patch by R. solani (AG 2-2) of turfgrasses. Cultures of the antagonistic fungi and bacteria varied in the effectiveness in reducing disease severity of Pytium blight and brown patch on bentgrass. The antagonistic fungal and bacterial isolates were mixed and cultured at 20-$25^{\circ}C$ for 3 days in a growth medium, and the diluted solution of the microbial culture was applied under the field conditions after inoculation of the above turfgrass pathogens. The treated turfgrass was incubated at 28$^{\circ}C$ in a growth chamber. In this experiment, Pythium blight was almost completely controlled and brown patch was slightly decreased by the microbial product, while no control was observed in large patch of zoysiagrass. In zoysiagrass treated with the microbial culture, thatch accumulation was notably reduced.

• 아시안잔디학회지
• /
• 제11권3호
• /
• pp.149-159
• /
• 1997

A study was carried out in order to elucidate utilization of agochemicals in golf courses scien-tifically. The analysis of amounts of agrochemical used in golf courses from 1991 to 1996 which were reported to government are ;Despite of increase of golf courses, the amounts of agrochemicals decreased from 1992 as turning point. The decrease of utilization of insecticides and herbicides made it possible. In fungicides, thiopanate-methyl WP, polyoxine D. thiram WP and iprodione WP were used much in general and their utilization ratios were high. In recent year, as fungicides for Pythium blight and large patch, oxapro WP and pencycuron WP's amounts of utilization increased, but utilization ratios were under 70%. In insecticides, penitrothion OL's quantity consumed and utilization ratios were the best, but showed tendency of decrease as registration of agrochemicals for turfgrass expanded. In herbicides, bensulide OL, napropamide WP, MCPP SL were used much and their utilization ratios were high. In recent year, flazasulfuron WP's amounts of utilization and utilization ratio increased relatively. Key words: Agrochemicals Golf courses, Insecticides, Herbicides,Fungicides.

• 아시안잔디학회지
• /
• 제13권3호
• /
• pp.131-138
• /
• 1999

A synergistic effect of biocontrol agent and chemicals on control of the large patch on turfgrass caused by Rhizoctonia solani AG2-2 was evaluated. Chemicals; mepronil, toclofos-methyl and iprodione inhibited 90∼100% mycelial growth of R. solani AG1 and AG2-2 in vitro. While on the other, the chemicals inhibited only 0∼5%, 18∼46% and 30∼67% of mycelial growth of the antagonists, respectively. In field application, toclofos-methyl was the best to suppress the disease in single application, however, the combination of mepronil and T. viride 41D showed highest disease control effect among combinations of antagonists and chemicals. Effect of the combination of mepronil and T. viride 41D was similar to that of toclofos-methyl and T. viride 41D stage of disease development, but became higher in six week late. Results indicated that the combined application of selected antagonistic agent and chemical increased control efficasy of turgrass large patch.

• 아시안잔디학회지
• /
• 제12권4호
• /
• pp.203-210
• /
• 1998

Environmental concerns arising from synthetic herbicides in plant management systems have led to an interest in plant-derived compounds as natural herbicides. Inhibitory effects of compounds extracted with 50% methanol from corn (Zea mays L.) and pine (Pinus densiflora L.) were evaluated on large crabgrass (Digitaria sanguinalis (L.) Scop.), annual bluegrass Poa annua L.), radish (Raphanus sativus L.), and perennial ryegrass (Lolium perenne L.) The aqueous extracts inhibited seed germination and had postemergence activity on the four species. The stability of biological activity of corn grain, stover, and root extracts was not affected by heating to $135^{\circ}C$ or freezing/thawing treatments when applied at levels above 0.25kg m(sup)-2 based on dry weights of powders before extraction. Heating reduced the activity of pine litter and bark extracts at all levels except the highest application level but had little effect on pine needle extracts.

• 아시안잔디학회지
• /
• 제7권2_3호
• /
• pp.61-66
• /
• 1993

This experiment was carried out in order to study effect of organic fertilizer on the growth of Korean lawngrass(Zoysia matrella L. Merr.) and the change of soil chemical characteristics. Results obtained are summarized as follows: l. Organic fertilizer was appropriate for base-dressing in the establishment of turfgrass by means of sod. 2. Chlorophyll contents in mixed application plot of complex organic fertilizer were more abundant than that in single application plot of organic fertilizer. 3. The yield of dry weight in single application plot of organic fertilizer was greater about 40% than that in control plot. 4. As a whole, the growth of Korean lawngrass in mixed application plot of complex and organic fertilizer was more greater than that in single application plot of complex fertilizer. 5. Application of organic fertilizer promote effectiveness of available phosphorous in soil.

• 아시안잔디학회지
• /
• 제7권1호
• /
• pp.13-18
• /
• 1993

Much attention has been given recently to solve the environmental contamination in golf courses Changing to culture practice rather than chemical practice that depends on pesticides and fertilizers is a hot issue in golf courses or grasslands. Organic soil conditioners improve soil-plant envirormental conditions rich in physical properties. In this study, measuring systems to evaluate soil conditioning effects were set up for on-site purpose. After establishing the methodology for evaluating soil conditioner effects, 2 kinds of organic conditioners were rested for examination. The systems for the methodology included a set of simulating equipment for field capacity, an impact type soil column compactor, and an infiltration-percolation system. Test results using the systems showed bulk density and infiltration rate of mixed soil were decreased at highter rates of conditioner, but total porocities were increased. Increased porocities were most capillary pore space which has a positive effect on soil water potential. The systems and methodology in this study seem to have an efficiency to measure the effects of soil conditioner on site purpose.

• 아시안잔디학회지
• /
• 제8권2호
• /
• pp.93-100
• /
• 1994

This experiment was carried our in order to study effect of alum sludge compost of water treat-ment plant on the growth of Korean lawngrass (zoysia japonica Steud.) and on the change of soil chemical properties. Alum sludge compost was made out of chicken feces, sawdust and alum sludge. The results obtained are summarized as follows : 1. Alum sludge compost was appropriate for organic fertilizer of turfgrass management in golf course. 2.Application of alum sludge compost improved the chemical properties of soil such as pH, available phosphorous and exchangeable calcium. Also the growth of Korean lawngrass grown by the mixed application of alum and compost was more effective than that in single application of compost. 3.Chlorophyll content of Korean lawngrass had no differences in several treatments. 4. Alum promoted the uptake of potassium, calcium and the yield of dry weight hut the yield of dry weight was not affected by chemical fertilizer. 5.Alumimum toxicity was decreased by the mixed application of alum and compost but increased by single application of alum.