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        • 겨울철 지하부의 가온처리가 경기장 잔디의 생육 및 무기성분 함량에 미치는 영향

          구자형,이혜정 한국잔디학회 2002 한국잔디학회지 Vol.16 No.2

          한국의 겨울철 온도 조건하에서 가온에 의한 근권부의 온도조절이 잔디생육과 품질에 미치는 영향을 조사하고 아울러 shoot의 무기성분 함량을 조사한 결과 다음과 같은 결론을 얻었다. 1. 겨울철 근권부의 온도를 20$\pm$2$^{\circ}C$로 유지한 결과 대조구의 잔디는 동해로 인해 생육이 멈춘 반면 온도 처리구에서는 공시된 한지형 잔디(Kentucky bluegrass, perennial ryegrass, tall fescue) 모두에서 녹색이 유지되었으며 예초를 요할 정도의 생육이 계속되었다. 그러나 들잔디의 경우 겨울철 근권부의 온도를 높여주어도 지상부의 생육은 불가능하였다. 2. 온도 처리구에서의 예초량은 tall fescue에서 가장 많았고, 엽록소 함량은 perennial ryegrass에서 가장 높았으며 Kentucky bluegrass는 안토시아닌 함량이 다른 종류에 비하여 높기 때문에 검붉은 색깔을 나타내는 shoot의 수가 많았다. 3. Shoot의 무기양분 함량은 N, P는 토양처리간에 차이가 없었고 K, Ca, Mg는 모래+peat moss에 비하여 모래+peat moss+soil 처리구에서 많은 것으로 나타났다. 4. 근권부의 가온조절은 한국의 겨울철 기온하에서 한지형 잔디의 생육을 도모하고 겨울철 잔디의 녹색을 유지시킬 수 있을 뿐만 아니라 눈 녹음을 촉진시켜 잔디의 이용률을 증진시킬 수 있는 방안으로 판단된다. Studies were conducted to determine the effect of undersoil heating on growth and quality of turfgrasses including Kentucky bluegrass (Poa pratensis L.‘Nuglade’), perennial ryegrass (Lolium perenne L.‘Accent’), tall fescue (Festuca arundinacea Schreb.‘Pixie’), and Korean lawngrass (Zoysia japonica Steud.) in simulated athletic field during winter season in Korea. Mineral contents in clippings of turfgrasses grown at different soil mixtures and temperatures were also analyzed. Undersoil heating (approximately 20$\pm$2$^{\circ}C$) was effective in protecting turfgrasses except Korean lawngrass from freezing injury and discoloration of shoots due to extremely cold temperatures during midwinter. Among turfgrasses grown at undersoil heating zone, tall fescue and perennial ryegrass showed the highest clipping weights and chlorophyll contents, respectively. However, anthocyanin contents of shoots were higher in Kentucky bluegrass. There was little or no difference in clipping weights, chlorophyll contents, anthocyanin contents and greenness of shoots between turfgrasses grown at two soil mixtures composed of 80% sand+10% peat moss+10% soil (v/v/v) and 80% sand+20% pea moss (v/v). Contents of mineral K, Ca and Mg in clippings of cool-season turfgrasses were comparatively higher in a soil mixture composed of 80% sand+10% peat moss+10% soil, but little difference in contents of N and P was observed between two soil treatments. Results indicated that undersoil heating can improve quality of turf surface by thawing soil, melting snow, and maintaining shoot growth and greenness of turfgrasses in sports field during winter season.

        • KCI등재
        • KCI등재

          몇가지 사과품종(品種)의 신초(新梢)에 미치는 SO<sub>2</sub> 가스의 피해(被害)

          구자형,Ku, Ja-Hyeong 충남대학교 농업과학연구소 1979 Korean Journal of Agricultural Science Vol.6 No.2

          In order to examine $SO_2$ injury to apple shoots, cutting shoots of five cultivars were exposed to 3 ppm $SO_2$ in vase life conditions. 1. The most sensitive cultivar to $SO_2$ was 'Rall's Genet', and 'Starking' was most tolerant among cultivars tested. 2. Ethylene production of shoots showed peak after 8 hours exposure, when visible injury was not appeared, and was decreased with increase in exposure time. 'Rall's Genet' showed slower decrease in ethylene production than other cultivars. 3. Chlorophyll a, b and a/b ratio were decreased in all cultivars after 40-hr exposures to 3 ppm $SO_2$ and greatly decreased in 'Rall's Genet' compared to other cultivars. $SO_2$가스가 사과 Golden Delicious, 축(祝), 국광(國光), Starking, 홍옥(紅玉)등의 신초(新梢)에 미치는 영향(影響)을 조사(調査)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. $SO_2$ 가스에 대한 저항성(抵抗性)은 Starking이 가장 높았고 국광(國光)이 가장 낮았다. 2. Ethylene 발생량(發生量)은 가시적(可視的)인 피해(被害)가 나타나지 않은 8시간 처리후(處理後)에 가장 많았으며 처리(處理)시간이 길어짐에 따라 현저(顯著)히 감소(減少)하였고 국광(國光)에서 가장 완만(緩慢)한 발생량(發生量)의 감소(減少)를 보였다. 3. Chlorophyll a,b 그리고 a/b ratio는 국광(國光)에서 가장 높은 감소(減少)를 보였고 기타의 품종(品種)들도 감소(減少)하는 경향(傾向)을 보였다.

        • KCI등재

          각종 살균제(殺菌劑)가 주요과수(主要果樹)의 화분발아(花粉發芽) 및 화분관신장(花粉管伸長)에 미치는 영향(影響)

          구자형,이재창,Ku, Ja-Hyeong,Lee, Jae-Chang 충남대학교 농업과학연구소 1978 Korean Journal of Agricultural Science Vol.5 No.1

          각종(各種) 살균제(殺菌劑)가 주요과수(主要果樹)의 화분발아(花粉發芽) 및 화분관신장(花粉管伸長)에 미치는 영향(影響)을 조사(調査)하였던바 다음과 같은 결과(結果)를 얻었다. 1. Difolatan-wp, Lime-Sulfur, Captan-wp, Bordeaux액(液)은 화분발아(花粉發芽) 현저(顯著)히 억제(抑制)시켰다. 2. Daconil-wp과 Zimaneb-wp가 미치는 영향(影響)은 Difolatan-wp등(等)에 비(比)하여 다소(多少) 가벼웠다. 3. Polyram-combi-wp, Topsin-wp, Benlate-wp는 발아(發芽)를 억제(抑制)하지 않았으나 화분관신장(花粉管伸長)을 다소(多少) 저해(沮害)하였다. 4. Polyoxin-wp는 오히려 화분관신장(花粉管伸長)을 촉진(促進)시켰다. 그러나 발아율(發芽率)의 증가는 없었다. The experiment was carried out in order to choose fungicides which are proper to be used in flowering time of fruit trees. The effect of fungicides on pollen germination and pollen tube growth was investigated in vitro. The results obtained are as follows : 1. Difolatan-Wp, Lime-sulfur, Captan-Wp and Bordeaux mixture greatly inhibited pollen germination and pollen tube growth. 2. The effect of Daconil-Wp and Zimaneb-Wp on pollen germination and pollen tube growth was not so great as that of Difolatan-Wp, Lime-sulfur, Captan-Wp or Bordeaux mixture. 3. Polyram-combi-Wp, Topsin-Wp and Benlate-Wp did not affect pollen germination but these fungicides slightly inhibited pollen tube growth. 4. Polyoxin-Wp significantly increased pollen tube growth but did not show promotive effect on pollen germinaiton.

        • 그늘하에서의 Kentucky Bluegrass와 Perennial Ryegrass 품종의 생육비교

          구자형,김태일,원동찬,송남현,송천영 한국잔디학회 1991 한국잔디학회지 Vol.5 No.1

          The purpose of this study was to determine the vegetative growth of two cool season turfgrasses during summer season in Korea. Ten respective cultivars of Kentucky bluegrass [Poapratensis L.] and perennial ryegrass [Lolium perenne L.] were exposed to unshaded, 30% and 60% shade for 4odays. First mowing height was 7cm, and then clippings were harvested every ten days at the same height. Shading increased the total length of clippings of all cultivars of two turfgrasses, but fresh and dry weight were significantly decreased. The highest shoot length obtained at 30% shade in Kentucky bluegrass and at 60% shade in perennial ryegrass. 'Rugky', 'Sydsport', 'Wabash' and 'Baron' of Kentucky bluegrass and 'Repel', 'Omega II', 'Ovation', 'Linn', 'Bell' and 'Manhattan' of perennial ryegrass showed relatively high tolerance to shade. Especially, in 'Citation II' perennial ryegrass, fresh and dry weight were increased by 30% shade. The number of tillers generally decreased with increasing shade. In 30% shade, 'Midnight' Kentucky bluegrass and 'Omega II' perennial ryegrass were least reduced and 'Baron' Kentucky bluegrass and 'Pennant' perennial ryegrass were most reduced. The cultivars of lower growth habit in full sunlight showed shade tolerance compared to those of higher growth habit.

        • Sodium Hypochlorite 처리가 좀부들의 종자발아에 미치는 영향

          구자형,송지원 忠南大學校 環境問題硏究所 2002 環境硏究 Vol.20 No.-

          습지에서 채취한 후 실온에 보관한 좀부들(Typha orientalis Presl) 종자의 자연발아율은 7%미만에 불과하였다. GA_3용액 50 및 100 mg·L^-1에 침지한 종자는 30℃의 광조건에서 약간의 발아촉진 효과를 보였으나 암 조건에서는 농도 및 발아온도에 관계없이 발아촉진 효과를 보이지 않았다. Sodium hypochlorite(NaOCl) 4% 용액에 시간별로 처리한 종자를 온도를 달리하여 발아시킨 결과 2시간 처리종자는 30℃에서, 3시간 처리 종자는 25℃에서 90%이상의 발아율을 보였다. 처리시간이 4시간 또는 6시간인 종자의 경우는 30℃에서 파종 후 1일 또는 3일만에 90%이상의 발아율을 보인 반면 20℃에서는 9일에 걸친 전체 발아율이 83%에 지나지 않았다. NaOCl처리는 종피의 색깔을 짙은 갈색에서 황색으로 탈색시켰고 종피를 매끈하게 부식시키는 결과를 보였다. 좀부들 종자에 대한 NaOCl에 의한 발아율 증진은 결국 탈색과 부식에 의한 투수성 증대에서 얻어진 효과로 판단된다. The seed germination of Typha orientalis was less than 7% when seeds were stored at room temperature after harvest from wetland. The percentage of germination was increased to 15% by 100 ㎎ㆍL_-1 gibberelline(GA_3) treatment at 30℃ under light condition, but there was no increase of germination under dark condition regardless of germination temperature and GA_3 concentration. Seeds treated with sodium hypochlorite(NaOCl, 4% available chlorine) for 2 h and 3 h were germinated more than 90% within I and 3 days after seeding at 30℃ in the respective seeds treated for 6 and 4 h. However, the total seed germination for 9 days after seeding was only 83% at 20℃ even though seeds were treated for 6 h. Sodium hypochlorite bleached the seed coat from dark brown to yellow in color and scarified evenly seed surface. These results suggest that the stimulation of seed germination in Typha orientalis by NaOCl treatment may be derived from the increase of water permeability through bleaching and scarifying the seed coat.

        • Zoysiagrass 종자 발아에 미치는 Sodiym Hypochlorite의 종피처리 효과

          구자형,김태일,원동찬 한국잔디학회 1989 한국잔디학회지 Vol.3 No.2

          Research was conducted to obtain t he optimum treatment Of sodium hypochlorite(NaOC I) at various temperatures in t he seed scarification for stimulating germination of zoysiagrass (Zocysia Japonica Steud ) seed. Morphological changes of seed coat were also examined by scanning electron micros cop(SEM). l. Differences in temperature of scarification with 2 .4% NaOCI showed little influence on promoting germination of seeds but seeds treated with 1% solution at l5˚C germinated less than that of higher temperatures. The promotion effect of 4% solution on germination was diminished when seeds were treated for 8 hours of more. The most favorable seed scarification unaffected hy temperature for enhancing germination was 4-6hours treatment at 4% solution in fresh seeds. 2. $GA_3$, treatment did not enhance germination of water-pretreated control seeds hut germination of seeds pretreated with NaOCI l was increased additional 10% or more hy$ GA_3$, Water pretreated control seeds treated with 50 mM hydrogen peroxide(H'O )germinated about 44%. In NaOCI treated seeds. $H_2$$O_2$ treatment increased germination additional l 0% or more. 3. NaOCI l and KOH treatment softened the seed coat and formed the pores hy removing the scab-like thikenings attached to the seed surface. These results suggest that the modes of action of NaOCl in the promotion of seed germination reside in it increase of the permeability of the seed coat, and in the provision of additional oxygen to the seed.

        • KCI등재

          스럿지肥料가 園藝作物의 生育에 미치는 效果

          具滋馨,金泰日,安周源,李奎承,金文圭 충남대학교 농업과학연구소 1992 농업과학연구 Vol.19 No.1

          To determine a potential of new sludge fertilizer for horticultural crops, comparative studies between commercial fertilizers (Jandibiryo and Wonyebokbi) and sludge fertilizer (Sludgebiryo) were made through examining the growth responses on zoysiagrass (Zoysia japponica Steud.) and several horticultural plants. 1. The pH of new sludge fertilizer remained near 6.5 regardless the particle size. The solubility of elements was highest in phosphorus, followed by nitrogen and potassium in the order. Especially, desorption of potassium was continued up to 48 hrs after solubilization. 2. There was an increase in shoot number per plant, length of stolon and rhizome, and root weight as well as clipping yield of zoysiagrass in the treatment of large size Sludgebiryo compared to small one and Jandibiryo. 3. Regardless the size of fertilizers, Sludgebiryo increased flower numbers in salvia (Salvia officinalis L. 'Hatzazz') compared to Wonyebokbi, although the difference was not great, However, leaf area and fresh weight of plant were more increased in Wonyebokbi application. 4, Flower diameter of marigold (Tagetes erecta L. 'Inca') was slightly increased in Sludgebiryo application, but the average number of lateral shoots and fresh weight per plant were significantly increased in the treatment of Wonyebokbi application. 5. Sludgebiryo effectively increased the length of both main and lateral shoots, number of flowers and weight of shoot in vinca (Vinca rosea L. 'Little Linde'), but root growth of plant was higher in Wonyebokbi application. 6, No differences between Wonyebokbi and Sludgebiryo were found in promoting the growth of leaves of perilla (Perilla frutescens Hara 'Yubsil' ), but chlorophyll content and seed weight were slightly higher in the application of Wonyebokbi compared to Sludgebiryo. In conclusion, the effectiveness of Sludgebiryo for horticultural plants was almost equal to commercial fertilizers such as Jandibiryo or Wonyebokbi. Expecially, Sludgebiryo appeared to effective on the growth of zoysiagrass, and the increase of flower size and numbers in flower crops. Results indicate that new-made Sludgebiryo can be recommended for turfgrass culture, and the flower crops in which quality depends on flower number and flower size.

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