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Effect of treatment of plant growth regulators such as GA3, NAA, and β-naphthoxy acetic acid, as well as boron in the flowers before hand pollinating was studied in order to improve the fruit setting in artificially pollinated flower. MAA and GA3 was relatively effective on fruit setting in hand pollinated flowers but nucleolated seeds was not counted. Fruits in NAA treatment plot were larger than the open pollinated fruits in size. But the fruits treated with GA3 were adversely smaller than the open pollinated fruits. Treatment of other plant growth regulators or boron did not affect on improvement of fruit setting in the artificial pollination. NAA and GA3 seemed to promote cell enlargement during fruit development but we could not obtain the nucleolated seeds from the fruits treated with NAA and GA3
The increasing pressure of agricultural import liberalization form abroad has given great burden to the Korean agricultural sector which has lagged far behind the industrial sector has been left as it was undeveloped mainly due to the unbalanced economic development policies. In addition to the rapid import -market liberalization, the agricultural production sector of Korea becomes more and more commercialized and the consumption patterns of agricultural products becomes diversified and high -quality oriented continuously. Chonbuk area, of which rice production is highest in Korea, is estimated to receive serious damage in future. Therefore Chonbuk agricultural industry should be changed into high -income agricultural system. Among many agricultural products the capital -technology intensive agricultural products such as vegetables, fruits, flowers, ginseng and processed foods are considered to be the most competitive in the agricultural markets of Japan, USA, South East Asia, and European countries. Particularly, apples and oriental pears among fruits which are producing in Korea are exporting to these countries and they are estimated to prove high income crops. Chonbyk area has good environmental condition for frult production. This theses emphasizes that technical improvement as well as administration support in fruit production should increase the farmer's income with respect to environmental condition in Chonbuk area.
In order to investigate the cause of low fruit setting in the artificial Pollinated flowers in Chinese jujube, the in vitro 맨lien germination was studied with effective substances added on the medium. Pollen germination varied with flowering stage with the highest germination rate at just after flowering in both cultivars. Pollen germination rate reduced below 30% after 6 hours from flowering. Boron 0.1% and sucrose respectively promoted pollen germination rate when added on medium. NAA 100ppm among plant growth regulators treated on medium was the most effective in pollen germination. None pollen germination observed in nectar collected from flowers. It was suggested that the impossible artificial pollination in Chinese jujube was not caused by un-usual pollen germination.
Double cropping system in a year in Kyoho grapes (Vitis labruscana L.) has currently been attemptedin the plastic greenhouse. One of the problems in double cropping system is the promotion of budbreak in summer season and shoot fertility. Effects of the control of soil moisture tension near the rootzone and treatments of bud dormancy breaking agents on bud breaking in summer were examined topromote the bud break for the second fruiting. The lignification of shoots was induced in July orAugust by the control of soil moisture tension in root zone environment. The first shoot growth wasalmost the same as that in common plastic greenhouses. The highest bud break value appeared in theplot of cyanamide chemicals mixed with merit blue as over 75% bud break rate. The bud break rate inthe discontinuing plot in irrigation showed significantly higher in bud break than that in the continu-ing plot in irrigation. Despite of the final high bud break rate, the time of bud break was irregular.
사과 후지품종의 착과생리에 관한 연구 : I.結果技頂芽크기 및 樹冠內 着果位置가 開花 , 結實 , 果實特性에 미치는 影響 I.Effect of terminal bud size on spur during a rest period and fruit setting position on flowering,fruit setting and fruit characteristics
In order to obtain available data for increasing fruit setting and fruit quality in Fuji apple(Malus domestica Borkh. ), studies were conducted to find out the relationship between some characters of terminal bud of spur during a rest period, flowering, fruit setting, and fruit quality. Fruit quality was also measured in relation to setting position of the tree. The results are summarized as follows ; 1 . Terminal buds of spur in Puji cultivar was smaller than that of Starkrimson and Jonathan. Flowering rates of Fuji was lowest except the trees grafted on M 26 rootstock which showed same flowering rates as Jonathan. 2 . Floral bud size was larger than the vegetative bud in terminal buds of spur. 3. Flowering rates and fruit setting rates increased with the increasement of bud size, especially with the increasement of bud length rather than width. 4. In Fuji cultivar high flowering rates were obtained from larger buds of 4.1㎜ width with 6.1㎜ length and in Starkrimson from the buds of above 4.1㎜ width with 7.1㎜ length. 5. Fruit setting rates of flowers of different bud size were similar except very small buds. 6. There was a close relationship between the size of buds and the mature fruit size, but no relationship with fruit color, sugar content or total acid content. 7. Almost all the small terminal buds of spur in Starkrimson were vegetative, but in Fuji many floral organs were observed even in small buds. 8. There was a close relationship between fruit quality and setting position of canopy ; The fruit quality bearing on east and north direction was inferior to that on south and west, and it was lower with lower position of same direction. Fruit quality bearing on long spur was lower than that on medium, or short spur.
Relationship between ion concentrations in fruit Juice and total contents of nitrogen, potassium and calcium in the fruit tissue was investigated in the physiological disordered apples in order to know whether juice ion measurement can be used to estimate the cause of physiological disordered Fuji apples (Malus domestics Borkh.). Juice ion concentrations were analyzed of pH/ion meter. Significant relationship between nitrate ion concentration of juice and total nitrogen was existed, while correlation coefficient was lower than that of normal fruits. There was no relationship between potassium and calcium. Total contents of N, K and Ca were lower in physiological disordered fruits than in normal fruits. Consequently, total contents of N, K and Ca in the fruit tissue can not be estimated by measuring ion concentrations in fruit juice of physiological disordered apples.