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- 저자 : 최경구 (검색결과 183 건)
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栽培地域에 따른 大豆品種別 播種基가 收量性에 미치는 影響
崔京求,權湧周,金鎭基,愼鏞圭,陳星桂,盧承杓 전북대학교 농업과학기술연구소 1980 農大論文集 Vol.11 No.-
To study the adaptation of some soybean cultivars and the suitable sowing date in the Jeonbug area, field experiments were made at 3 sites (Jeonju,Jinan and Jangsu) in 3 growing seasons(early sowing, ordinary sowing and late sowing), Yields and some agronomic characteristics were investigated obtaining the following results. 1. Emergence required longer period in the early sowing (May 25) than the ordinary sowing(June 10) or the late sowing (lune 25)which required the shortest period. No difference was found among varieties in the same sowing date. 2. Number of days from sowing to flowering decreased with a delayed sowing date. The rate of shortened period of time was found in Jangsu, Jinan and Jeonju in increasing order. 3. A delayed sowing date decreased stem length, stem thickness, number of nodes in the main culm, number of pods in the main culm and 100-grain weight showing remarkable de-creases among indeterminate varieties. 4. Seed yield also decreased with a delayed sowing date. 5. The highest yield was found in indeterminate varieties such as Williams or Hill in early or ordinary sowing in Jeonju. However, Kwang-kyo or Suweon #83 gained the better yields in late sowing. 6. In hilly areas (Jinan or Jangsu) determinate varieties, such as Kanglim, Suweon #83 or Kwang-kyo, gained comparatively high yields in any sowing date.
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美國人蔘(Panax quinquefolium)에 있어서 Callus 誘起 및 器官分化에 미치는 植物生長調節劑의 影響
崔京求,株龍範,張永男 전북대학교 농업과학기술연구소 1992 農大論文集 Vol.23 No.1
This study was carried out to investigate the effects of some plant growth regulators such as kinetin, naphthalic acetic acid(NAA), 2, 4-dichlorophenoxy acetic acid(2, 4-D), indoleacetic acid(IAA) and yeast extract on the callus induction and organ differentiation of Panax quinquefofium. Stem apex, stem, root and leaf blade of the explant were cultured in e modified Murashige and Skoog's medium supplemented with different concentrations of the plant growth regulators at 23'c under dark condition. Subculture was done on the medium added with 2mg of 2,4-D per liter, and 5mg of NAA, respectively. 1. In callus induction and growth the root was first initiated and stem apex, stem and leaf blade in order were followed. 2. The medium containing 2mg of 2, 4-D per liter was most effective in callus growth and NAA was also effective in growth of the explant. 3. Although NAA showed the significant effect in rooting from various parts of the explant, no effect was observed with 2, 4-D. The amount of callus growth and rooting increased proportionately with NAA concentration in the range of 5mg per liter in the medium. 4. IAA was not effective in callus induction from P. quinquefolium explant. 5. Callus growth with yeast extract was accelerated in 2, 4-D medium, but completely depressed it in NAA medium. 6. NAA was effective in rooting and shooting from the explant in subculture but 2, 4-D was only effective in callus forming and growth.
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최경구,오재희,김성수,김재묵 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.7
The influence of excess iron content (x) and reaction atmosphere on permittivity, permeability and microwave absorbing properties has been investigated in composite specimens embeded with (Ni0.4Zn0.6O)1-x(Fe2O3)1+x powders. A nitrogen atmosphere used for the reaction of the ferrite with excess iron composition (x>0) enhances spinel formation, and thereby increases both the magnetic and the dielectric loss of the ferrite composite. We also investigated the relation between the electromagnetic constants and the absorbing properites using impedance-matching solution maps for zero reflection. It is suggested that a superior microwave absorber can be fabricated through atmosphere and excess iron control during the powder process.
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崔京求,崔定植,金鎭基,權湧周,李王休,全炳機 전북대학교 농업과학기술연구소 1981 農大論文集 Vol.12 No.-
The present study was a part of the project surveying ecological characteristics of soybean collections for breeding materials. Under short day conditions (9 hrs) after flowering, all fifty-five cultivars showed the following results. 1. Seed ripening periods were shortened under short day conditions after flowering, and the accelerating rate was larger in the cultivars from the USA and other country than with domestic or Japanese cultivars. 2. Accelerating in maturity was larger in Kwangdu. Tousan 69, Ao-7445, Pi-31408 and Pi-68552, whereas the flowering nonsensitive varieties under short day conditions, like Haman. Gembokin, Harosoy, Wirth, Wayne and Pi 54613, had the same nonsensitivity in maturity. 3. The short day length during the seed ripening period tended to decrease morphological characteristics such as stem height, stem diameter, number of nodes, number of pods per plant, and number of seeds per plant showing little difference between varieties or their origins. 4. The short day conditions during the ripening period caused a decreas in 100 seed weights showing little variation between origins. The short day leneth also influenced weight of seed per plant showing a difference between origins-that is domestic varieties showed a larger decrease than those from the USA or Japan.
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崔京求,李成春,張永男 전북대학교 농업과학기술연구소 1983 農大論文集 Vol.14 No.-
The purpose of this study was to search the variability of salt tolerance among the major rice varieties in the germination period by the difference in the rooting activity of the seedlings grown for 15 days after transplanting of 30-day-old ones in different salt solutions. The germination ability was checked under the temperatures of 15, 25 and 35℃, and 7 levels of salt solutions. such as 0, 0.15, 0.30, 0.50, 0.75, 1.00 and 1.50%, respectively. The rooting activity of 33rice cultivars was checked with salt solutions of 0, 0.15, 0.30, 0.50, 0.75 and 1.00%. The results obtained are summarized as follows: 1. The germination percentage and the hermination speed were significantly increased as the temperature rose up from 15℃ to 25℃ and 35℃. 2. At the same temperature, the germination percentage and the germination speed of decreased as the salt concentration increased. This was more apparent at the low temperature(15℃ plot) than at the high temperature such as 25℃ and 35℃ plot. The salt damage in germination showed even more at lower concentration at the 15℃, than that at the 25℃, or 35℃. 3. The decreasing ratio of the germination percentage and the germination speed of the early, medium and late maturing cultivars were not greatly influenced at the high temperature as the salt concentration increased, but those at the low temperature were outstandingly decreased. Particularly, the early and medium maturing varieties were severely damaged at low temperature han at high temperature. 4. The germination speed of the rice cultivars that originated from japonjca and indica-japonica hybrids (Tongil lines) were generally impeded by increasing the salt concentrations. The degree of salt damage in germination was higher in Tongil lines than that of japonica varieties. 5. Remarkably significant negative correlations were recognized between slat concentrations, germination percentage and germination speed regarless of the origin of cultivars and maturing season. The relationship of salt concentration and germination speed was more distinguished and that showed marked correlation coefficient at the low temperature (15℃) than at the high temperature (25℃ or 35℃). 6. It follows that it may be resonable evaluate the salt tolerance of rice seeds by comparison of germination speeds at low temperature. The tested 33 major cultivars for salt tolerance could be classfied as follow: High; Palkweng, Palkum, Mangyeong, Dongjinbyeo, Dongimbyeo, Chucheongbyeo. Medium; Tongil, josaengtongil, Hwanggeumbyeo, Geumgangbyeo, Palgwangbyeo, Taebaegbyeo, Chupungbyeo, Nampungbyeo, Yushin, Saesbyeolbyeo, Iri-332, Sameseongbyeo, Seogwangbyeo, Baegunchalbyeo, Jinjubyeo,Pungsanbyeo, Baegyangbyeo, Milyang-21, Milyang-22, Milyang-30, Milyang-42, Cheongcheongbyeo. Low; Manseogbyeo, Hangangchalbyeo, Pungsanbyeo, Raekyung, Milyang-23 7. Plant height, root length and fresh root weight of seedings grown 15 days after transplating in different salt solution were gradually reduced with salt concentrations, but the number of roots was less affected than others. 8. There existed remarkably signifficant negative correlation between salt concentration and pant height, root length, and fresh root weight, and that with root length showed apparantly with comparison of the others. 9. The rooting activity of the cultivars was estimated by measuring root length in different salt solutions. The tested cultivars for rooting activity could be classified into three groups as follows; High; Josaengtongil, Hwanggeumbyeo, Yushin, Saesbyeobyleo, Pungsanbyeo Middle; Tongil, Geumbyeo, Manseogbyeo, Palgwangbyeo, Taebaegbyeo, Chupung byeo, Hangangchalbyeo, Nampungbyeo, Palkweng, Palkum, Iri-322, Samseongbyeo, Seowangbyeo, Bagunchalbyeo, Jinjubyeo, Baegyangbyeo, Nagdongbyeo, Milyang-21, Milyang-22, Milyang-23, Raekyung, Milyang-30, Milyang-42, Cheongcheongbyeo, Dongimbyeo, Chucheongbyeo Low; Mangyeong, Dongjinbyeo.
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