二輪移秧機에 있어서 直線移秧程度의 向上에 關한 硏究(Ⅰ) : the effects of rudder attached to the float on the straight transplanting extent Float에 附着된 Rudder가 直線移秧程度에 미치는 效果

崔福衍 全南大學校 農漁村開發硏究所 1979 農業科學技術硏究 Vol.14 No.-

國內에서 現用되고 있는 二輪移秧機가 갖고 있는 缺点의 하나인 非直線移秧性의 改善을 爲해, 깊이와 附着位置를 變數로 한 Rudder를 Float에 附着한 後, 이들이 移秧線圖, 株間距離, 走行低下率, 合低抗等에 미치는 影響等을 調査하고, 아울러 그 實用可能性과 範圍를 檢定하기 爲하여 1979年度에 本大學 畓作圃場에서 一連의 實驗을 遂行하였던 바 그 結果를 要約하면 다음과 같다. 1. 移秧線圖에 있어서 Rudder附着區들은 共히 無附着區에 比해 週期, 振幅, 平均離脫距離等이 減少되어 實用可能性이 認定되었다. 2. Rudder附着에 依한 株間距離의 減少는 일어나지 않았으나 栽培的則面에서의 利用可能區들은 3-0-3, 0-3-0, 6-0-6, 0-6-0區들인 것으로 나타났다. 3. Rudder附着은 走行低下率을 增加시켰으나 無附着區와 有意差가 認定되지 않았던 區들은 3-0-3, 0-6-0區였다. 4. Rudder附着은 合低抗을 增加시켰으나 無附着區와 有意差가 없었던 區는 3-0-3, 0-3-0, 0-6-0 區들 이었다. 5. 以上의 結果를 綜合해 볼때 株間距離, 走行低下率, 合低抗에 對한 具備條件을 모두 充足시킬수 있었던 가장 合理的인 處理水準은 3-0-3區인것을 알 수 있었고, 境遇에 따라 實用化할 수 있는 處理水準들은 株間距離의 減少를 招來하지 않는 0-3-0. 6-0-6,0-6-0 區들인 것으로 나타났다. This experiment was carried out to improve the straight transplanting extent by the attachment of rudder to the float in two-wheel ricetransplanter used in Korea. To find out the practicality and the limits of rudder, the effects of rudder which is variable in depth and place on several factors such as the transplanting diagram, the within-row plant spacing, the slippage, and the total running resistance were investigated in items at the agricultura! farm, Chonnam National University during 1979. The results are summerized as follows; 1. In transplanting diagram of every plot attached rudder to the float, the wave length and height, the mean distance of deviation from the straight line within 48 hills were decreased sharply compared with those of control. Therefore, attachment of rudder to float was considered to have a great effect on the improvement of straight transplanting extent. 2. Even though there was no difference in the within-row plant spacing among treatments, 3-0-3, 0-3-0, 0-6-0, 6-0-6 were considered as the useable treatment in the light of cultivation especially. 3. The effects of rudder was high in increasing of the slippage, but there was no difference in slippage among 3-0-3, 6-0-6 and control. 4. The attachment of rudder to the float also increased the total running resistance, but the plots which were not effected by attachment of rudder was found out to be only 3-0-3, And 0-3-0, 6-0-6, 0-6-0 were considered as the useable treatments in some circumstances. 하

자탈형 콤바인의 예취작업법에 관한 연구 -혼합예취법을 중심으로 (제1보)-

최복연 한국농공학회 1976 한국농공학회논문집 Vol.18 No.2

This experiment was carried out to investigate the efficient turning method which will be able to use every cutting methods, to calculate the width of the center field which must transpose from rotary cutting method to return cutting method, to investigate the effects of L/W and unit field on the operation efficiency. The results are summarized as follows: 1. In case of cutting in the outer field, the efficient turning method is the "$\alpha$" type turning method (half U-shaped turning method) at the first rotation, is the "$\beta$" type turning method (T-shaped turning method) at the second to fourth rotation. 2. In case of cutting in the inner field, the efficient turning method which takes the least turning time is the "a" type turning method ($\Delta$-shaped turning method). 3. The width of the center field (W') changes by the length-width ratio (L/W) and width (W), W' is 9.0m in case that L/W is 2.5 and W is 30m. 4. The larger L/W and area of unit field (A) become, the more operation efficiency (E) increases, and the limits that E is affected signicantly by L/W is 2 to 3.5 and A is within 5,000$m^2$. within 5,000$m^2$.

조직간 정보시스템에서 지각한 상호작용성이 조직애호도에 미치는 영향

최복연,김동태 한국경영정보학회 2013 Asia Pacific Journal of Information Systems Vol.23 No.1

The purpose of this research is on the identification of the effects of perceived interactivity formed by the electronic collaborative referral system on the organizational loyalty. Two channels through which the effects proceeded were investigated. One is the “system channel” which consists of “interactivity of the inter-organizational system → intention of using the system → organization loyalty” (hypothesis 1, 2), that is the channel which anticipates that a better understanding on the interactivity of the inter-organizational system makes the intention of the using the system strong, and this strong intention results the higher organization loyalty. The other is “organization channel” which consists of “interactivity of the inter-organizational system → perceived interactivity on the counterpart → perceived relation benefits with the counterpart → organization loyalty” (hypothesis 3, 4, 5). The channel means that as the perceived interactivity of users on the inter-organizational system becomes greater, the perceived interactivity with the counterpart is increasing. And this makes the users feel that more benefits can be obtained by the relationship with system providing organization, and finally makes the organization loyalty that is the intention to maintain the relationship greater. The corroborative evidence data confirm the two channels are obtained by questing on the electronic referral system of Samsung Medical Center to the doctors of the first and second collaborated hospitals or clinics, and by analyzing statistically. The verification result for the “system channel” showed that as the perception on the interactivity of inter-organizational system was increasing, the intention for consistent using increased(support hypothesis 1), and then the organization loyalty that is the relationship maintaining indication by using the referral system also increased(support hypothesis 2). And the confirmation result for the “organization channel” indicated that the perceptive interactivity on the counterpart increased as the understanding on the interactivity of inter-organizational system increased(support hypothesis 3), consecutively, with the intuitive relation benefits increase with the counterpart(support hypothesis 4) the organization loyalty means the intention to maintain the relationship was confirmed to increase(support hypothesis 5). These results demonstrate that when the perceived interactivity in using many systems at the collaboration between organizations is increasing, the positive image on the systems creates the consistent system using intention, and the positive image increases the wants for preserving the relationship with counter organization. In addition, the perceived interactivity of inter-organizational system users affects directly on the perceived interactivity of the counter organization, so the important role of inter-organizational system in promoting the interactivity between cooperative counterparts was recognized. And the perceived interactivity on the counter organization become greater, the influence on the perceived benefits from cooperation is positive. Therefore, the perceived interactivity by using inter-organizational system was confirmed as a prerequisite for the continuous relationship.

湖南地方에 小麥導入을 爲한 田作 作付體系 確立에 關한 硏究

李廣植,崔福衍 全南大學校 農漁村開發硏究所 1979 農業科學技術硏究 Vol.14 No.-

湖南地方의 田作 作付體系에 小麥導入을 爲한 方案의 하나로서, 裸麥에 비해 小麥이 갖고 있는 低收量, 收穫期遲廷等의 栽培的脆弱点을 馬鈴著와의 間作으로서 얻어질 수 있는 作物間의 相互補完關係를 利用, 이를 解消할 수 있는 可能性을 檢討하고 아울러 小麥이 導入된 가장 合理的인 作付體係, 卽 單位面積當 所得을 提高시킴과 同時에 地力을 維持 增進시킬 수 있는 作付體系를 確立하고자 1978年 全南道 原種場 羅州分場에서 日蓮의 實驗을 遂行하였던 바 그 結果를 要約하면 다음과 같다. 1. 改善間作區의 小麥收量은 慣行單作區에 比해 若干 增收하는 傾響이 있었으나 處理間에 收量差에 대한 有意性은 없었다. 따라서 條間에 植栽된 馬鈴著는 小麥生育에 아무런 影響을 미치지 않는 것을 알수 있었다. 그러나 間作區서의 馬鈴著水量은 單作區에 比해 무려 30%程度 減收되어 小麥은 馬鈴著生育에 크게 影響을 미치는 것을 알 수 있었다. 2. 作物栽培徒 土壤의 化學的性質의 變化樣相은 一般的으로 燐酸과 加里는 集積하고, 有機物은 減少하는 傾向을 나타냈다. 그리고 PH는 多少 增加하는 傾向이 있었다. 3. 供試作物中 가장 所得이 높앗던 作物은 참깨와 春作馬鈴著였다. 4. 前作物에 있어서 裸麥에 比해 所得이 높았던 小麥組合區는 小麥+春作馬鈴著 間作區였고, 그 所得指數는 283.5%이었다. 5. 慣行栽培區에 比해 所得이 높은 小麥組合區中 實用이 期待되는 處理區는 小麥→참깨, 小麥→大豆+春作馬鈴著→大豆인 것으로 思料되었다. 6. 以上과 같은 結果로 미루어 볼때 湖南地方의 田作作付體系에 小麥을 導入하기 爲해서는 小麥, 春作馬鈴著, 참깨 大豆를 위주로 한 作付體系가 바람직할 것으로 思料된다. With one of the methods to introduce wheat into up-land cropping system in Honam area, this experiment was performed to investigate the possibility of intercropping wheat and potato, at the same time to systematize the most reasonable cropping system which is not only able to increase income perunit area but also to improve fertility at the Naju Farm of Chonnam Original Seed Station from October 1977 to december 1978. The analyses were concentrated more in economic base than in physiological sides. The results obtained are summerized as follows; 1. Eventhough there was a tendency to increase yield in intercropping, difference in yield of wheat between single culture and intercropping was not found out. But yield of potato in intercropping was decreased sharply by 30% in comparision with that in single cultrue. So we can get the conclusion that in case of intercropping wheat and potato, the latter had not effect upon wheat growth, but former had a bad effect upon potato. 2. Among all of crops, the highest crops were sesame and spring-planted potato. 3. In prior crops, higher income cropping system combinated with wheat than that of naked-barley was the wheat and potato intercropping system. 4. Among all of cropping system combinated with wheat of which income was higher than that of naked-barley-soybean system, the system which was considered to habe practicality in future was wheat-sesame, wheat and potato-soybean system. 5. In chemical properties of cultivated soil, it was found out that T-N and K₂O were accumulated, but organic matter and pH were decreased a little in comparision with those of original soil. 6. Accordingly we come to the conclusion that cropping system from now no should be consisted of wheat and potato as a prior crop, sesame and soybean as a succeeding crop in order to introduce wheat into up-land in Honam area.

新除草劑 Mon-0358의 除草效果

尹柱敬,崔福衍 全南大學校 農漁村開發硏究所 1975 農業科學技術硏究 Vol.10 No.-

水循 本畓用 新除草劑 Mon-0358의 除草效果를 알기 爲하여 1975年에 本 大學校 畓作圃場에서 藥量과 時期別로 Machete와 比較하여 몇가지 實驗을 하였던 바 그 結果를 要約하면 다음과 같다. 1. Mon-0358 RAT 2kg 處理區는 除草效果나 收量에 있어서 慣行區 및 Machete 1DBT 3kg 處理區와 有意性이 없는 것으로 나타나 Machete와 더불어 本畓 除草劑로서 效果가 좋은 藥劑라고 본다. 2. Mon-0358 RAT 2kg 處理區와 8 DAT 4kg 處理區는 除草效果에 있어서 有意性이 없어 使用藥量은 RAT일 경우 2kg, 8 DAT일 경우 4 kg이 適當하다고 思料된다. 3. 이 地方 優生雜草인 알방동신이의 防除效果는 Mon-0358 RAT 2kg 處理區가 慣行區 및 其他 處理區에 比하여 가장 높았고, 물달개에 對해서는 Machete 1DBT 3kg 處理區와 7DAT 3kg 處理區가 慣行區 및 Mon-0358 處理區에 비하여 높았으며, 여귀버들에 對해서는 Mon-0358 RAT 2kg, 8DAT 4kg 處理區가 다른 處理區에 比하여 높았다.水循 本畓用 新除草劑 Mon-0358의 除草效果를 알기 爲하여 1975年에 本 大學校 畓作圃場에서 藥量과 時期別로 Machete와 比較하여 몇가지 實驗을 하였던 바 그 結果를 要約하면 다음과 같다. To find out the effect of weed control of Mon-0358 , new herbicide, in transplanted rice paddy, this field experiment was carried out by the ratio and time of application in compared with Machete on the test field of Agricultural College, Chonnam National University in 1975. The results are summerized as follows; 1. There was no difference in effect of weed control and grain yield among the application of 2kg Mon-0358 RAT(Right After Transplanting) and hand weeding, application of 3kg Machete 1DBT(Day Before Transplanting). Mon-0358 is considered as a excellent new herbicide with Machete in transplanted rice paddy. 2. There was no difference in effect of weed control between the application of 2kg Mon-0358 RAT and 4kg Mon-0358 8DAT(Day After Transplanting). The desirable ratio of application is considered 2kg in case of RAT and 4kg in case of 8DAT. 3. The application of 2kg Mon-0358 RAT was more effective to increase the percentage of weed control to Cyperus difformis which is a predominant weed in Chonnam area compared with hand weeding and other treatments. The effect of 3kg Machete 1DBT and 7DBT to Monochoria vaginalis was higher than that of hand weeding and Mon-0358. The effect of 2kg Mon-0358 RAT and 4kg 8DAT to Ludwigia prostrata was higher than that of other treatments.

除草劑에 依한 복숭아果樹園의 雜草 防除試驗

尹柱敬,崔福衍 全南大學校 農漁村開發硏究所 1977 農業科學技術硏究 Vol.12 No.-

最近 全南地方의 복숭아 果樹園에서 크게 問題視되고 있는 果樹園 雜草의 效率的인 藥劑防除를 爲하여 1976年부터 77年까지 2年에 걸쳐서 Paracol 40 E.C. Paraquat 24.5 E.C. Roundup 41 E.C.를 濃度, 回數, 時期를 달리해 一連의 防除實驗을 實施하였던 바 그 結果를 要約하면 다음과 같다. 1. 圃場實驗 1. 本實驗圃에 發生된 雜草의 種類는 9科 12種이었으며, 그 中 優点雜草는 쑥, 환삼덩굴, 망초, 여뀌, 소리쟁이, 둑새풀이었다. 2. Paracol과 Paraquat는 소리쟁이를 除外한 쑥, 환삼덩굴, 망초, 여뀌, 둑새풀에 對해 아주 優秀한 除草效果를 보여 주었으며, Paracol은 80g/10a, Paraquat는 100g/10a 濃度水準에서 95% 以上의 높은 殺草率을 나타냈다. 3. Roundup은 쑥, 환삼덩굴에 對해 200g/10a 濃度水準에서 95% 以上의 높은 殺草率을 보여 주었으나, 300g/10a 高濃度水準에서의 망초, 여뀌, 소리쟁이, 둑새풀에 對한 殺草率은 名名 73.1%, 81.9%, 70.4%, 58.8%로 Paracol이나 paraquat에 比하여 낮았다. 2. Pot 實驗 1. 藥劑의 撤布時期은 Paracol, Roundup이 다같이 開花期가 84.5%, 84.5%, 82,7%로 幼苗期의 72.1%, 74.3%, 71.5%나 生育盛期의 74.4%, 72.2%, 64.1%에 比해 높았다. 2. 藥劑의 撤布 回數에 따르는 殺草率은 Paracol, Paraquat, Roundup이 다같이 2回 撤布가 75%, 74.6%, 74.3%로 1回 撤布의 62.1%, 63.1%, 63.1%에 比하여 높았다. 3. 藥劑의 濃度, 時期, 回數에 따라 95% 以上의 殺草六을 보여 주었던 處理區 가운데 가장 效率的이라 생각된 區는 Paracol이 開花期에 80g/10a, 1回 撤布區와 幼苗期에 2回 撤布區와 幼苗期에 2回 撤布區였으며, Roundup은 開花期에 300g/10a 1回 撤布區와 幼苗期에 100g/10a 2回 撤布區였다. 끝으로 本 實驗을 遂行하는데 있어 積極的으로 協力해 주신 全北大學校 染 桓承 博士께 忠心으로 感謝를 드린다. Weeding in peach orchard, especially in spring and summer, is one of the most serious problems in Chonnam area. Control trials with several herbicides such as Paracol 40 E.C Paraquat 24.5 E.C and Roundup 41 E.C were carried out on the field as well as with the potted weeds for two years from 1976 to 1977. The results are summarized as follows: A. Field test 1. Weeds in peach orchard of the experimental farm, Chonnam National University were 12 species of 9 families, of which Artemisia oulgaris, Erigeron conadensis Humulus japonicus, Alopeculus aequalis, Rumex crispus and Polygonum hydropiper were the predominant ones. 2. All the weeds but Rumex crispus were effectively controlled by Paracol or Paraquat. Withering ratio of more than 95% was obtained by the application of 80g/10a of Paracol or by 100g/10a of Paraquat. 3. Roundup was proved to be less effective than the other two herbicides in controlling orchard weeds. Even though more than 95% of Artemisia vulgaris and Humulus japonicus could be controlled by 200g/10a, of Roundup only 73.1% of Erigeron eanadensis, 81.9% of Polygonum hydropiper, 70.4% of Rumex crispus, 58.8% of Alopeculus aequalis even by 300g/10a of Roundup. B. Pot test 1. Three kinds of herbicides, Paracol, Paraquat and Roundup were applied at different growing stages; seedling, vigorous vegetative growth, and flower bud formation. The difference in weeding effect among herbicides was not found. However, flower bud formation stage was proved to be the most appropriate time for herbicide application. The highest withering ratio of more than 81% was obtained from the application at flower bud formation stage compared to around 70% from those at other two stages. 2. Double applications of any herbicides resulted in about 75% withering ratios, which were higher than those (about 62%) form single application. 3. Among the treatments resulted in withering ratios of more than 95%, single application at flower bud formation stage or double applications at seeding stage with 80g/10a of Paracol, single application at flower bud formation stage or double applications at seedling stage with 100g/10a of Paraquat, and single application with 300g/10a at flower bud formation stage or double applications at seedling stage with 100g/10a of Roundup were considered as the effecient methods in controlling weeds in Peach orchard.

Gibberellin, Urea 및 微量要素의 葉面撒布가 桑葉의 몇가지 形質에 미치는 影響

李載窪,崔福衍 全南大學校 農漁村開發硏究所 1975 農業科學技術硏究 Vol.9 No.-

桑葉에 Gibb. Urea와 微量要素를 倂用한 葉面撤布가 桑葉의 葉面積 및 新梢長, 桑葉의 生, 乾物重, 葉綠素의 含量과 GOT, GPT의 活性에 미치는 影響을 分析 檢討하였던 바 그 結果를 要約하면 다음과 같다. 1. U. 와 G.U 處理葉面撤布가 葉面積 增大에 果가 컸고, U., G.U, 處理葉面撤布가 新梢長增大에 效果가 컸다. 2. U. 單一處理葉面撤布와 Gibb. 複合處理 葉面撤布가 桑葉의 生, 乾物重을 增大시켰다. 3. 葉綠素의 含量은 測定時期別에 따라 各 處理間에 相當한 差異가 있었고 一般的으로 桑葉의 伸長最盛期가 높았다. 4. 桑葉의 GOT 活性度는 一般的으로 桑葉生育初期에는 높았고 成熟함에 따라서 活性은 떨어졌다. 5. 桑葉의 GPT 活性度도 GOT와 비슷한 結果를 나타냈다. The effects of folliar applications of urea, gibberellin and various micronutrients on the leaf area, shoot growth, fresh and dry weight, and GOT and GPT activity of mulberry leaves were investigated. The results are summarized as the following; 1. Leaf area was significantly increased by application of urea only or urea with Gibb. and the shoot growth was highly favored by urea and/or Gibb. 2. Fresh and dry weight of leaves were also significantly increased by urea only or urea with Gibb. 3. Chlorophyll content in leaves varried according to the different treatments as well as the time of measurement, however, it was high in general at the time of maximum shoot growth. 4. GOT activity in leaves were generally high during early part of growing season but gradually decreased toward maturing. 5. GPT activity in leaves showed the similar tendency to that of GOT.

우리나라 園藝作物의 主要天敵에 對한 生態 및 分布에 關한 硏究 : With Special Emphasis on Those to Pear Insects 배나무 害蟲 天敵을 中心으로 With Spectal Emphasts on Those to Pear Insects

崔福衍,尹柱敬,安奬淳,金光秀 全南大學校 農漁村開發硏究所 1979 農業科學技術硏究 Vol.14 No.-

With the purpose of study on the ecology and distribution of natural enemies of some harmful insects in major horticultural crops, harmful insects and their natural enemies were collceted from some pear orchards in Chonnam province and the ecological observaticons were made during March to December, 1978. Some important results are summarized as follows: 1. In the devastated pear orchads, Psylla pyrisuga Forster, Illibgris pruni Dyar, Stephantis nashi E. et T., Grapholitha molesta Busck, Cnidocampa flavescens Walker, and Nippolaehnus piri Mat. were the major insects found, whereas Pseudococcus comstocki Kuwana, Aphanostigma iakusiense Kishida, mites, and those belonging to Tortricidae, Aphididae and Carposinidae were the predomimant ones in the commercial pear orchards. 2. Insecticides most commonly sprayed to pear orchards were in the order of Parathion, Metasytox, Sevin, Sumithion, and Supracid. 3. The highest number (237) of the mummified larvae of Pseudoccous comstocki were found on the trunks about I metre high above the soil surface in the wintering trees, and also more than one mummies on the average were found from a fruit bag under storage. 4. Emergence of parasitic wasp was mostly occurred in the morning than in the after noon, and the period of emergence was less than 10 days in Allotropo burrelli and about 14 days in Pseudaphycus malinns. 5. Out of the larvae of P. comstocki examined from August 7 to November to November 7, 0.8% to 46.7% were mummified. Judging from the death ratio of the insects in the bags of damaged fruits on trees, the ratio of insects parasitized by natural enemies was estimated as 2.7% to 46.7%. The larvae of Kalodiplosis japonicus, a kind of fly were also substantially parasitized in certain cases. 6. Four species of parasitic wasps were collected from the larvae of P. comstocki, of which A. burrelli was the predominant one followed by P. malinus. The sex ratio was 2.2 to 1 for A. burrelli and 3.4 to 1 for A. malunus. The two other species were A. suvalbipes and A. convexiferous. 7. In order to control P. comstocke, 11 inscticides including Folithion and 6 Folithion mixtures containing DDVP and Supracid were tested. The surviavl ratios of natural enemies were very low in the plots of Metasystox, Paration, and DDVP with 0%-6.7% and 11.0% respectively compared to 84.7% of thecontrol plot. Those in the DDVP mixed with Lebaycid or Rouxon were alsovery low with 2.1% and 6.3% respectively. 8. Protolaelaps Pygmaeus, predatory white mities, was more widely distributed than the red mite, and parasitism to P.comstocki was very high with around 80%. 9. The spiders collected from the fruits during September to October were 63 belonging to 15 species of 6 families wheras those collected from the trees in November were 503 belonging to 32 species of 11 families. Erigonidium graminicola, as the predominant species, was 64.71% in September, 23.7% in Octovedr, and 41.52% in November, of the total spiders collected. 10. Other natural enemies belonging to 5 species of 3 families and 2 orders were also collected, but their parasitic ratio was insignificant. 11. Natural enemies were always found, regardless of the amount, whenever P. comstocki or A. iakusciense were severe, A. burrelliwas found without fail but P. mallinus was limitted to some caseses in the orchards with abandant P. comstocki, and P.pygmaeus was sure to occur where the damage by A. iaknsicense was severe. Therefore, A. burrelli and P,phgmaeus are considered to be the affective natural enemies to those two harmful insects in the pear orchards.

자탈형(自脫型) 콤바인의 예취작업법(刈取作業法)에 관(關)한 연구(硏究) -혼합예취법(混合刈取法)을 중심(中心)으로 (제(第)1보(報))-

최복연 ( Bok Yun Choi ) 한국농공학회 1976 韓國農工學會誌 : 전원과 자원 Vol.18 No.2

This experiment was carried out to investigate the efficient turning method which will be able to use every cutting methods, to calculate the width of the center field which must transpose from rotary cutting method to return cutting method, to investigate the effects of L/W and unit field on the operation efficiency. The results are summarized as follows: 1. In case of cutting in the outer field, the efficient turning method is the "α" type turning method (half U-shaped turning method) at the first rotation, is the "β" type turning method (T-shaped turning method) at the second to fourth rotation. 2. In case of cutting in the inner field, the efficient turning method which takes the least turning time is the "a" type turning method (Δ-shaped turning method). 3. The width of the center field (W') changes by the length-width ratio (L/W) and width (W), W' is 9.0m in case that L/W is 2.5 and W is 30m. 4. The larger L/W and area of unit field (A) become, the more operation efficiency (E) increases, and the limits that E is affected signicantly by L/W is 2 to 3.5 and A is within 5,000㎡. within 5,000㎡.

除草劑에 衣한 복숭아果樹園의 雜草 防除試驗

尹桂敬,崔福衍 전남대학교 한국농어촌개발연구소 1977 농산어촌개발연구 Vol.12 No.-

Weeding in peach orchard, especially in spring and summer, is one of the most serious problems in Chonnam area. Control trials with several herbicides such as Paracol 40 E.C Paraquat 24.5 E.C and Roundup 41 E.C were carried out on the field as well as with the potted weeds for two years from 1976 to 1977. The results are summarized as follows: A. Field test 1. Weeds in peach orchard of the experimental farm, Chonnam National University were 12 species of 9 families, of which Artemisia vulgaris, Erigeron canadensis Humulus japonicus, Alopeculus aequalis. Rumex crispus and Polygonum hydropiper were the predominant ones. 2. All the weeds but Rumex crispus were effectively controlled by paracol or Paraquat. Withering ratio of more than 95% was obtained by the application of 80g/ 10a of Paracol or by 100g/10a of Paraquat. 3. Roundup was proved to be less effective than the other two herbicides in controlling orchard weeds. Even though more than 95% of Artemisia vulgalris and Humulus japonicus could be controlled by 200g/10a, of Roundup only 73.1% of Erigeron eanadensis, 81. 9% of Polygonum hydropiper, 70.4% of Rumex crispus, 58.8% of Alopeculμs aequalis even by 300g/10a of Roundup. B. Pot test 1. Three kinds of herbicides. Paracol, Paraquat and Roundup were applied at different growing stages; seedling. vigorous vegetative growth, and flower bud formation. The difference in weeding effect among herbicides was not found. However, flower bud formation stage was proved to be the most appropriate time for herbicide application. The highest withering ratio of more than 81% was obtained from the application at flower bud formation stage compared to around 70% from those at other two stages. 2. Double applications of any herbicides resulted in about 75% withering ratios, which were higher than those (about 62%) from single application. 3. Among the treatments resulted in withering ratios of more than 95%, single application at flower bud formation stage or double applications at seedling stage with 80g/10a of Paracol, single application at flower bud formation stage or double applications at seedling stage with l00g/10a of Paraquat, and single application with ‘ 3OOg/10a at flower bud formation 훌ge or double applications at seedling stage with lOOg/10a of Roundup .weπ considered as the effecient methods in controlling weeds in Peach orchard.