各種 土壤 管理가 柑橘品質에 미치는 影響 : Influence of Artificial Mulch during Fruit Development Season 夏秋季의 土壤被覆 效果

韓允三,韓海龍,文斗吉 제주대학교 1974 논문집 Vol.6 No.-

With polyethylene film and straw, artificial mulch from early Aug. to harvest time was experimented in a Citrus orchard on volcanic soil growing nine years old Satsuma mandarin(Citrus unshiu Marcovitch) on trifoliate orange stock. No matter what material is used, mulch delayed loss of soil water. Low soil moisture level desirable for delicious fruit quality was not attained by preventing rain flow to soil with polyethylene film, except only when mulched on already dried soil. While polyethylene film mulch increased soil temperature by 3'C at 10cm depth, straw mulch lowered soil temp. in summer. Change in soil temp. showed no apparent effect on fruit maturity and quality. Dry soil condition accelerated fruit coloring a little, and increased Brix, but decreased fruit weight, and didn't increased Brix-acid ratio. It was concluded that polyethylene film mulch could hardly be practiced to improve Citrus fruit quality in Seogwipo area orchards on volcanic soil.

5-Chloroindazol-8-acetic Acid Ethylester(Figalon)에 依한 溫州蜜柑의 藥劑摘果에 關한 硏究

韓海龍 건국대학교 1979 論文集 Vol.10 No.1

Various concentrations (100-500ppm) of Figalon (J-455 : 5-chloroindazol-8-acetic acid eth-ylester) were sprayed on 6 year old 'Miyakawa wase' Satsuma mandarin (citrus unshiu Mar.) tree on trifoliate orange stock, about 30 days after full bloom. And on three different dates (30, 45, and 60 days a(text full bloom), 150ppm Figalon solution was sprayed on 12 year old 'Miyakawa wase.' Fruit drop ratio, changes in the ratio of leaf-to-fruit, and quality of the harvested fruits were investigated. Results obtained are summarized as follows: 1.Higher concentration of Figalon sprayed, more fruits dropped. Figalon spray, however, cause less fruit drop than 200ppm NAA. 2.Spray on June 6 (45 days after full bloom) was most effective, as a thinning agents among the sprays on three different dates or 30, 45 and 60 days after bloom. 3.Fruit dorp accelerated by Figalon, occured mainly during early and middle July. 4.Figalon spray seemed to increase the fruit growth and Brix of the fruit juice at harvest The degree of increase, however, varies with year.

遮光程度가 양하(Zingiber mioga)의 生育, 收量 및 無機成分 含量에 미치는 影響

韓海龍,張田益,朴庸奉 제주대학교 1981 논문집 Vol.13 No.-

양하는 생강과 더불어 중요한 香辛菜蔬지만 濟州道에서는 그 栽培法과 양하의 食用價値를 정확히 모르고 있다. 이에 繁殖方法의 하나로서 遮光程度를 달리하였을 경우 양하의 生育과 收量 및 無機物 含量에 미치는 影響을 調査한 結果는 다음과 같다. 1) 양하의 草長과 葉數는 遮光程度가 높을수록 增加하는 傾向을 보였으나 葉소莖과 葉幅은 生育初期에는 處理間에 비슷한 傾向을 보였으나 生育後期에는 增加하는 速度가 緩慢하였고 遮光程度가 낮을수록 增加하였다. 2) 3.3㎡當 收量은 70%遮光區에서 가장 많았고 處理區는 對照區 보다 多少 增加하는 傾向을 보였다. 3) 줄기와 잎에서는 遮光程道가 높을수록 窒素, 인산, 가리, 마그네슘, 망간의 含量이 對照區 보다 增加하였으나 鐵成分 만은 對照區의 줄기에서 가장 많은 含量을 보였다. 4) 위의 實驗의 結果 양하의 生育, 收量 및 無機成分量은 70%遮光에서 增加하였고 앞으로 遮光程度와 處理時期을 달리하여 계속 硏究할 必要가 있다고 생각된다. Among major condimental vegetables, Zingiber mioga and ginger has not yet been examined in cultivation method and contents of inorganic element in Cheju Island. This experiment therefore was carried out to investigate the effect of several shading treatments on growth, yields and contents of inorganic elements of Z. mioga. The results are as follows : 1) The higher the shading degree, the higher the plant height and leaf number, but neck diameter and leaf width showed no significant difference from the early growth period while the late growth period, the lower the shading degree, the higher the neck diameter and leaf width. 2) In the yields of 3.3㎡ unit area, the 70% shading treatment showed sligh increase in compare with other treatment. 3) In contents of the inogranic element of leaf and stem, the higher the shading degree, the higher the content of nitrogen, phosphor, potassium, magnesium and manganese, but only the iron increased in compare with other treatment at the stem of control lot. 4) The result indicated that the growth, yields and contents of inorganic element increased significantily at the 70% shading treatment. The results also point out that study of different shading degree and shading period are necssary.

鱗片 및 珠芽에 對한 低溫處理와 光中斷이 暖地型 마늘의 生育과 二次生長에 미치는 影響

韓海龍,朴庸奉,張田益 제주대학교 1984 논문집 Vol.19 No.-

濟州在來의 珠芽,普通鱗片과 上海早生의 珠芽 및 普通鱗片에 各各 30日,60日間의 低溫(0~5℃)處理를 하여 2月 20日부터 5月 20日까지 120分間을 光中斷處理를 하여 이들 處理가 마늘의 生育 및 鱗莖形成에 미치는 影響을 調査하였다. 1. 濟州普通鱗片은 冷藏處理 其間이 길수록 出現이 빨랐고 珠芽는 길수록 늦은 경향을보였다. 2. 草長,葉長은 普通鱗片이 珠芽보다 컸으며 低溫處理기간이 길수록 增加하였다. 上海早生의 普通鱗片은 自然日長區가 光中斷處理區 보다 增加하였다. 3. 葉墅長 및 葉墅莖은 低溫處理 其間이 길수록 增加했으며 특히 上海普通鱗片은 60일 低溫區에서 光中斷處理 效果가 크게 나타났다. 4. 鱗莖肥大率은 冷藏處理 其間이 길수록 普通鱗片에서 높았고 濟州普通鱗片은 30,60일,上海普通鱗片은 60日 冷藏處理에서 光中斷處理 果가 컸다. 5.珠芽의 植物體重과 球重은 冷藏處理 期間이 길수록 減少했으며 普通鱗片에서도 光中斷處理는 오히려 增加하였다. 6. 鱗片數는 上海珠芽를 제외하고 30日 冷藏處理에서 많았다. 7. 收量은 普通鱗片이 珠芽보다 많았고 光中斷處理는 上海早生의 無處理區와 60일 冷 藏處理구에서 增加하였다. 8.GA₃ 의 含量은 각 處理에 관계없이 鱗片肥大 最盛期에 增加하였으나 收穫期에 가까 울수록 減少하는 傾向을 보였다. Garlic seed bulbils of ecotypes,Cheju Jaere and Shanghae wase,were planted after treatment at 0-5℃for 30 and 60 days respectively, and treated night interruption (120 min) pretreated with low temperature from 20th February to 20th May. The results are summarized as follows. 1.With an increment of the period of low temperature, sprouting of Cheju common clove tended to early while bulbil was late. 2. Plant height, leaf length,leaf sheath length and neck diameter were all promoted by exposure to longer low temperature. however common clove of Shanghae wase grew better during natural day than with night interruption. 3. Bulbing was promoted by longer low temperature in common clove and Cheju Jaere common clove. Treatment for 30 and 60 days at low temperature plus 120min.night interruption showed the most significant increases. 4. Plant weight and bulb weight of bulbils decreased with longer low temperature but in common clove they were increased by night interrutpion. 5. The clove number of the shanghae wase bulbil incresed with 30 days low temperature treatment. 6. Yields per 10a of common clove increased more than bulbils and Shanghae common clove when treated for 60 days at low temperature plus 120 min. night interrutption. 7. GA content incresed at the clove enlargement period,but decresed with the approach of the harvest period.

冠芽를 利用한 파인애플 '大農 5號'의 器內增殖에 關한 硏究

姜聖根,韓海龍 濟州大學校 亞熱帶農業硏究所 1988 亞熱帶農業硏究 Vol.5 No.-

파인애플 ‘大農 5號 ’의 冠芽를 器內培養하여 大量繁殖을 試圖할 境遇, NAA와 BA가 新梢生育에 미치는 影響과 摘合한 培地의 種類, 그리고 培養條件을 究明하고, 木圃 栽植時 培養苗와 吸芽苗의 生育을 比較하기 위하여 實施한 試驗結果를 要約하면 다음과 같다. 1. 新梢의 生育은 1/2 MS 培地에 蔗糖 4.0%, BA 1.0㎎/ℓ을 添加한 後 培養容器에 20%의 培地를 注入하여 액체진탕배양하는 것이 效果的이었다. 2. 不定芽를 繼代培養한 結果 chimera, albino 矮性形態의 變異個體가 5代째 6.1%, 6代째 15.9%가 發生되었다. 3. 뿌리의 發根에는 1/2 MS 培地에 活性炭 1.0g/ℓ을 添加한 後 1,500 ㏓의 光度條件에서 固體培養하는 것이 效果的이었다. 4. 揷木床에서의 發根은 器內培養時 100%에 比하여 IBA 2.0㎎/ℓ處理區에서 99.4%, NAA 2.0㎎/ℓ處理區에서 98.6%였으며, 그 다음이 無處理 89.7%, Auxibaron 56.6%, Rooton 54.7%, IBA 10.0㎎/ℓ50.5%, NAA 10.0㎎/ℓ46.2% 順이었다. 5. 器內培養苗는 吸芽苗보다 初期生育은 低調하였으나 時日이 經過함에 따라서 生育이 促進되었고, 栽植 後 360日째에는 草長 7.3㎝, 葉數 6.3個 程度가 增加되어 栽培期間 短縮이 期待되었다. The experiments were conducted to find out the effects of NAA and BA, to determine the optimal medium and the culture conditions for masspropagation of pineapple (Ananas comosus (L.)MERR) Daenong #5 (Smooth Cayenne ×Yellow Moritious), by using the crown explant, and to compare the degree of growth between plantlets obtained by shoot tip culture and the suckers. The results obtained were summarized as follows; 1. Multiple shoots were obtained by agitating half strength salts of Murashige and Skoog liquid medium containing 4.0% of sucrose and 1.0㎎/ℓof BA. 2. The varigated adventitious buds such as chimera, albino, and dwarf type were responsible for 6.1 and 15.9% at the 5th and the 6th subculture, respectively. 3. In vitro rooting was better in the half strength salts of MS solid medium containing 1.0g/ℓof the activated charcoal than in the liquid medium under the light condition of approximately 1,500 lux of light with a photoperiod of 16 hours. 4. In vitro rooting was easier than in vivo, and rooting percentages by each chemicals used were 99.4 in 2.0㎎/ℓIBA, 98.6 in 2.0㎎/ℓNAA, 56.6 in Auxibaron, 54.7 in Rooton, 50.5 in 10.0㎎/ℓIBA, 46.2 in 10.0㎎/ℓNAA and 89.7 in the control. 5. In general, the plantlets produced by in vitro culture showed poorer growth than the suckers at the early stage of growth after transplanted into soil mix, while in vitro cultured plantlets showed much better growth than the suckers at the late stage. The plantlets from in vitro culture were 7.3㎝ higher and produced 6.3 leaves more than did the suckers 360 days after transplanting.

濟州道에서 Feijoa(Feijoa sellowiana Berg.)의 果實發育에 關한 硏究

白子勳,朴才昊,韓海龍 濟州大學校 亞熱帶農業硏究所 1992 亞熱帶農業硏究 Vol.9 No.-

濟州道 地方에서 feijoa (Feijoa sellowiana Berg.)의 經濟的 果實 生産 可能性에 關한 基礎資料를 얻기 위하여 'Mammoth', 'Triumph', 'Robert' 및 'Coolidge' 品種에 대하여 9月 下旬부터 11月 上旬까지 果實의 外的, 內的, 發育 狀態를 調査한 結果는 다음과 같다. 增加倍數 收穫時 結果 從徑 1.62~1.7 48.35~51.84㎜ 橫徑 1.77~1.8 38.85~40.97㎜ 果重 4.73~6.59 41.54~50.85g 果肉重 6.17~9.69 8.35~11.06g 果肉步合比 1.31~1.71 20.79~22.45% 果皮두께 1.49~1.66 7.28~7.45㎜ 糖度 1.35~1.74 12.65~15.11。Brix This study was conducted to obtain the data for feijoa (Feijoa sellowiana Berg.) production in Cheju. Four feijoa cultivars-Mammoth, Triumph, Robert and Coolidge-were compared in development of fruits harvested at different maturing stages. Increasing rate of fruit size (fruit length, width and weight) and fruit quality (pulp weight, pulp content, skin thickness and soluble solids) were examined from Oct. 26 to Nov. 5 (90~130 days after anthesis) in 1990. The results obtained are summerized as follow. Increasing rate Fruit size and quality (Nov.5) Fruit length 1.62~1.7 48.35~51.84mm Fruit width 1.77~1.8 38.85~40.97mm Fruit weight 4.73~6.59 41.54~50.85g Pulp weight 6.17~9.69 8.35~11.06g Pulp content 1.31~1.71 20.79~22.45% Skin thickness 1.49~1.66 7.28~7.45mm Soluble solids 1.35~1.74 12.65~15.11。Brix

溫州蜜柑 夏·秋枝의 發生 및 生長에 미치는 c-MH의 效果

文斗吉,許英珍,韓海龍 濟州大學校 亞熱帶農業硏究所 1986 亞熱帶農業硏究 Vol.3 No.-

溫州蜜柑(Citrus unshiu)에 있어서 夏·秋枝 發生의 化學的 抑制 方法을 探索하는 一環으로 c-MH(maleic hydrazide의 choline鹽)의 利用可能性을 檢討한 結果를 要約하면 다음과 같다. 1. 橋本早生 幼木을 供試하여 6月 中旬부터 9月 初旬에 걸쳐 時期 및 濃度別로 1回 處理한 c-MH의 效果는; 1) 夏枝의 生長은 遲延되었으나 頂芽優勢現象이 없어져 新稍發生數는 오히려 增加되었으며 가지별 生長 특히 잎의 生長이 抑制되었고 심한 경우에는 쐐기 모양의 奇形葉이 出現되었다. 2) c-MH 處理에 依한 夏枝의 生長抑制 效果는 7月 處理區에서 그리고 250ppm 以上의 濃度에서 觀察되었다. 3) 秋枝發生은 1,000ppm 以上의 濃度 1回 處理로 充分히 抑制되었다. 2. 興津早生 結實樹에서 8月 下旬에 이미 發生된 夏枝를 除去한 後 2,000ppm을 1∼2回 處理한 結果; 1) 無處理區는 除去後 얼마 안있어 新梢가 많이 發生되었으나 處理區는 많은 눈이 形成되었지만 가지의 生長은 볼 수 없었다. 2) 處理 當年度 果實은 c-MH 處理에 의해 果汁의 糖度가 增加되었고 酸含量은 減少되는 傾向을 보였다. 3) 2回 處理區는 翌年의 春枝發生이 遲延되었을 뿐만 아니라 發育이 심히 抑制된 가지에서 쐐기모양의 奇形葉이 叢生하였다. 4) 그러나 顯微鏡으로 觀察한 잎의 橫斷面 細胞의 크기는 奇形葉과 正常葉 사이에 差異가 없었다. 5) 處理 다음 해에는 開花時期가 遲連되었고 着花數도 減少되었다. 6) 2回 處理區의 翌年度 果實은 發育이 抑制되었고 果梗部가 突出하였으며 果皮가 두껍고, 거칠은 奇形果의 發生이 많았다. 그러나 1回 處理區는 無處理區와 같았다. 3. 米澤溫州와 宮川早生의 結實樹를 供試하여 7月 下旬부터 10日 間隔으로 500PPM의 C-MH를 2∼3回 그리고 8月 下旬 1,000ppm 1回 處理로 夏·秋枝 發生을 充分히 抑制할 수 있었다. 果實의 發育과 果汁 成分에 미치는 c-MH의 效果는 試驗年度와 供試品種 에 따라 달랐다. The chemical control of summer and autumn shoots in Satsuma mandarin (Citrus unshiu) was examined using the foliar application of the choline salt of maleic hydrazide(c-MH). The results obtained are summarized as follows: 1. The effects of the concentrations and the dates of application were investigated in two-year old tress of 'Hashimoto Early'. 1) While the occurrence of summer shoot was delayed by c-MH, many buds were stimulated to grow afterwards. The growth of individual shoots, especially leaves, was conspicuously retarded. 2) The growth of summer shoot was affected by the application of 250ppm or higher in July. 3) The occurrence of autumn shoot was completely inhibited by an application of 1,000ppm or higher in late August. 2. Fruiting trees of 'Okitsu Early' were sprayed once or twice with 2,000ppm c-MH in late August after artificial removal of summer-shoots. 1) Regrowth of new buds in the current season was totally restricted by c-MH. 2) Juice Brix of the fruit in the current season seemed to be increased by c-MH, while acid content decreased. 3) Double sprays of 2,000ppm resulted in the delayed sprouting and the rosette-type shoots with underdeveloped wedge-shaped leaves in the following spring. 4) No differences in cell size were recognized under an optical microscope between the normal and the underdeveloped leaves. 5) Flowering was also delayed and the number of flowers was reduced by c-MH. 6) Abnormal fruits with protruded stem-end and thickened rough peel resulted from the double sprays of 2,000ppm in the end of the previous growing season, but not from the single spray. 3. It was demonstrated in fruiting trees of 'Miyagawa Early' and 'Yonesawa' Satsuma mandarin that the occurrence of summer flush could be inhibited by 2∼3 sprays of 500ppm c-MH during the period from late July to mid August and that of autumn flush by a spray of 1,000ppm in late August. The effects of c-MH on the fruit development and juice quality varied with years and orchards.

휘가론과 에스렐 葉面撒布가 溫州蜜柑의 落果 및 果實品質에 미치는 影響

文斗吉,高康豪,韓海龍 濟州大學校 亞熱帶農業硏究所 1993 亞熱帶農業硏究 Vol.10 No.-

장마기 이전에 약제를 살포할수 있는 화학적 적과방법을 확립하기 위하여 탱자에 접목한 宮川早生 溫州蜜柑 (Citrus unshiu. Marcovitch cv. 'Miyagawa')을 공시하여 휘가론(5-chloroindazol-8-acetic acid ethylester)과 에스렐(2-chloroethylphosphonic acid)의 적과효과를 '87∼'92년 6년간 시험한 결과를 요약하면 다음과 같다. 1. '87∼'90 4년간 시험에서 제 1차 생리낙과가 거의 끝나는 6월 15일전후 (과경 10∼16㎜인 시기)에 휘가론 50mg/l 살포로 최종착과수를 20∼30%정도 감소시키는 적과효과를 얻을수 있었다. 그러나 무처리구의 최종엽과비가 14이하로 착과과다인 경우는 휘가론 단독살포만으로는 목표엽과비에 접근하기 어려웠다. 2. 만개 후 20∼25일인 6월 13∼15일에 엽면살포한 휘가론 (50mg/l)과 에스렐 (5∼200mg/l)의 낙과촉진 효과는 相加的으로 작용하여 두 약제 혼용살포구에서 그리고 에스렐 농도가 높을수록 낙과가 많았다. 3. 50mg/l이상 농도의 에스렐은 낙엽율을 증가시켰는데 휘가론 혼용은 에스렐의 의한 낙엽증가를 경감시켰다. 4. 착과안정기의 엽과비는 '91년도는 대조구 14에 비해 에스렐 25mg/l 단독살포구 36, 휘가론 50mg/l 가용 에스렐 12.5mg/l 살포구에서 39가 되었으며 '92년도는 대조구 10.5에 비해 에스렐 10∼40mg/l 단독살포구에서 17∼18, 휘가론 50mg/l 가용 에스렐 5∼20mg/l 살포구에서 14∼24였다. 5. 만개 후 15일부터 1주 간격으로 5주간에 걸쳐 에스렐 20mg/l의 살포시기를 달리한 결과 모든 처리에서 살포 후 2주째에 낙과가 급증되었다. 최종낙과율은 비록 살포일 사이에 유의차는 인정되지 않았지만 살포시기가 가장 빨랐던 6월 8일 살포구와 가장 늦었던 7월 8일 살포구와 가장 늦었던 7월 6일 살포구에서 많았다. 6. 화학적 적과의 실증실험에서 '91년도는 대조구의 착과안정기 엽과비가 16.9였는데 비하여 휘가론 50mg/l 살포구는 21.6 휘가론 50mg/l+에스렐 50mg/l 혼용구는 196.5로서 에스렐 50mg/l 가용은 적과과다에 의한 착과과소 상태를 초래했다. '92년도 시험에서는 대조구의 엽과비가 12.2였는데 비하여 휘가론 50mg/l 과 에스렐 20mg/l 단용구 및 혼용구의 엽과비가 각각 15.2, 15.6, 21.3이였으며 휘가론 혼용은 에스렐에 의한 낙엽율 증가를 경감시켰다. 7. 적과정도에 따라 과실크기가 증가하였으며 특히 과육중의 증가가 인정되었으나 착과과소상태의 경우를 제외하고는 과즙의 감미비에는 별 영향이 없었다. 8. 만개 후 20∼25일이 되는 6월 10∼15일경과경이 10∼15mm인 시기에 휘가론 50mg/l의 단독살포 또는 착과정도에 따라 20mg/l 전후의 에스렐을 혼합 살포함으로써 적절한 적과효과를 얻을 수 있다고 생각되었다. In order to establish the chemical fruit-thinning method of applying thinning agents before rainy season, the effect of Figaron (5-chloroindazol-8-acetic acid ethylestel) and Ethrel (2-chloroethylphosphonic acid) was evaluated in 'Miyagawa' Satsuma mandarin (Citrus unshiu Marcovitch cv. Miyagawa) grafted on trifoliate orange stock during '87-'92. The results obtained are summarized as follows: 1. Foliar spray of Figaron (50mg/l) on about June 15 accelerated fruit-drop, resulting in the decrease in the number of fruits by 20-30%. In case of over-fruit load less then 15 of final leaf-fruit ratio in Control, however, it was calculated that the ideal leaf-fruit ratio could not be obtained by the application of Figaron alone. 2. When foliar-sprayed on June 13-15 (20-25 days after full bloom), Figaron (50mg/l) and Ethrel (5-200mg/l) additively accelerated fruit-drop, resulting in more fruit-drop by more concentrated Ethrel with Figaron. 3. Higher concentration of Ethrel more than 50mg/l increased leaf-drop ratio, and the effect was reduced by Figaron. 4. The numbers of leaves per fruit in '91 were 14, 36 and 39, respectively, in the plots of Control, 25mg/l Ethrel only, and 12.5mg/l Ethrel with 50mg/l Figaron. Those in '92 were 10.5, 17-18 and 14-24, respectively, in plots of Control, 10-40mg/l Ethrel only, and 5-20mg/l Ethrel with 50mg/l Figaron. 5. Foliar spray of 20mg/l Ethrel on 5 different days at one-week interval from 15 days after full-bloom resulted in the remarkable increase in fruit-drop ratio in the second week after spray. Though significant difference in the final fruit-drop ratio among the dates of spray was not statistically recognized, the highest was observed in the plots of June 8 and July 6. 6. In the practical test of chemical fruit-thinning in '91, the numbers of leaves per fruit after June drop were 16.9 and 21.6, respectively, in the plots of Control and 50mg/l Figaron, and that in the plot of 50mg/l Ethrel with 50mg/l Figaron was 196.5, resulting in too few fruits from excessive thinning effect. Those in '92 were 12.2, 15.2, 15.6, and 21.3, respectively, in the plots of Control, 50mg/l Figaron, 20mg/l Ethrel, and 20mg/l Ethrel with 50mg/l Figaron. Leaf drop caused by Ethrel was reduced by the addition of Figaron. 7. The size and weight of fruit, especially pulp weight, increased according to the degree of fruit-thinning, while the Brix/acid ratio in juice was not affected except in the case of too few fruits caused by excessive thinning. 8. It was suggested that practical fruit-thinning could be attained by the foliar spray of 50mg/l Figaron or the mixture of 50mg/l Figaron and 20mg/l or so(depending on the degree of fruit load) of Ethrel on June 10-15, or 20-25 days after full bloom.

3중 적층형 압전 트랜스듀서의 주파수 특성

李鎔國,李海龍,韓得永 건국대학교 1995 學術誌 Vol.39 No.2

Frequency characteristics of a three-layered piezoelectric transducer are analyzed with three piezoelectric ceramic disk vibrators and two sheets of thin isolator. The electric input voltage near its fundamental resonant frequency is applied to the center vibrator and the output voltages across the left and the right vibrators are connected in parallel or in series to the resister load. Moreover, equivalent circuits are derived from the Mason's model for parallel connection and series connection. Also, equations of voltage ratio, resonant frequency, phase angle between the Input and output voltages, and bandwidth have been derived. Computed values from those equations are compared with measured values. Both are shown to agree well each other. Key words : Three-layered piezoelectric transducer(3중 적층형 압전 트랜스듀서), Equivalent circuit(등가회로), Parallel connection(병렬연결), Series connection(직렬연결), Resonant frequency(공진주파수), Bandwidth(대역폭)

矮化劑 處理가 바나나의 生育 및 收量에 미치는 影響

李宗錫,姜榮吉,朴才昊,韓海龍,文斗吉,金龍湖 濟州大學校 亞熱帶農業硏究所 1990 亞熱帶農業硏究 Vol.7 No.-

바나나에 알맞은 矮化劑를 選拔하고자 몇종의 矮化劑를 Dwarf Cavendish에 처리하였던 결과를 요약하면 다음과 같다. 1. 주당 80mg 이하의 paclobutrazol 土壤灌注 처리는 草長, 莖葉特性, 果實收量, 果實特性 등에 영향을 주지 않았다. 200mg 이상 처리구에서는 草長과 假莖長이 단축되는 경향을 보였고 果梗長은 유의성 있게 단축되었으나 다른 莖葉特性이나 果實收量, 果實特性은 무처리구와 큰 차이가 없었다. 2. 주당 20mg의 ancymidol 土壤灌注에 의해서 草長과 假莖長이 단축되는 경향이나 다른 莖葉特性이나 果實收量, 果實特性은 무처리구와 큰 차이가 없었다. 3. 5000ppm의 chlormequat 수용액 2회 葉面撤布區에서는 草長, 莖葉特性, 果實收量, 果實特性 등이 무처리구와 비슷하였다. 4. 草長과 假莖을 현저히 단축시키는 藥量의 矮化劑를 처리할 때 果梗이 假莖에서 빠져나오지 못할 것으로 보여 바나나에 있어서 矮化劑의 실용성은 없을 것 같다. This study was conducted to select growth retardants for bananas grown in a plastic greenhouse. The various rates of paclobutrazol(40, 80, 200 and 400mg/plant) and 20mg/plant of ancymidol were soil drenched and 5000ppm solution of chlormequat was foliarly sprayed twice. Application of less than 80mg of paclobutrazol did not affect plant height, pseudostem and leaf characteristics fruit yield and fruit characteristics. Application of 200 or 400mg of paclobutrazol tended to reduce plant height and pseudostem length and significantly shortened fruit stalk but did not affect the other characteristics. Application of 20mg of ancymidol tended to reduce plant height and pseudostem length but did not influence the other characteristics. Foliar spray of 5000ppm solution of chlormequat did not influence any measured plant traits. Application of growth retardants to bananas grown in a plastic greenhouse may not be beneficial because growth retardant rates to reduce plant height and pseudostem length significantly appear to prevent fruit stalks from fully emerging.