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養液裁培에 의한 상추의 物質生産 및 光合成에 特性에 關한 硏究
許煇,柳慶烈,崔基準 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2
These experiments were carried out for three terms (1st : 5/23-6/28, 2nd : 8/14-9/l9, 3rd : 9/20-l1/11) to investigate the rate of Dry Matter Production and Photosynthesis of hydroponically cultivated lettuce. The results were obtained as follows : 1.The number of Lettuce leaf in each culturing term was higher in the third term than in others and the emergence rate of the 1st term was the factest one. 2.Among the terms, the photosynthetic activity was in its highest in the 1st term. Progressing curve of photosynthesis during the day showed similar patterns but the highest rate of photosynthesis occurred at noon in the first term, 1 P.M. in the second term, and 11 A. M. in the third term. 3.Fresh weight of the 3rd term increased to 158% compared to that of the 1st term. However, that of the 2nd term decreased to 54% and the rate of dry weight and of specific leaf area decreased, too.
植物生長調節劑 處理가 水稻의 生理的 特性에 미치는 影響 Ⅱ. 分蘖期 處理와 稻體의 生理生態的 特性 및 收量
崔基準,許煇,趙東三 충북대학교 농업과학기술연구소 1989 農業科學硏究 Vol.7 No.1
This study was carried out to determine the effects of plant growth regulators, PP-333, NTN-821 and GA3, on the physiological and ecological characteristics of rice plant. Two rice varieties, Gihobyeo(Japonica type) and Seokwangbyeo(Japonica × Indica type), were treated with PP-333, NTN-821(0,9,18,27g/10a), and GA3(0,100,200,300ppm) at tillering stage, respectively. 1.Plant height was reduced by PP-333, but not by NTN-82l or GA3. Seokwangbyeo was more sensitive than Gihobyeo to the growth regulators applied. 2.PP-333 and NTN-821 promoted tillering of both varieties, but GA3 promoted tillering of only Gihobyeo. 3.Length of leaf blade was shortened by PP-333 and no significant difference was resulted by NTN-821. Lower leaf blades were elongated more than control, but upper leaf blade was shortened by GA3. 4.PP-333 and NTN-821 treatments at the tillering stage shortened culm length of both varieties. GA3 treatment increased length of lower internodes but shortened that of upper internodes. 5.The chlorophyll content in leaf and root activity were increased by PP-333 and NTN-821 but they were decreased by GA3, Respiration rate was increased by PP-333 and GA3 treatment, but it was decreased by NTN-821. 6.In organic components of leaf blade were increased by PP-333 application at tillering stage, but other treatments showed significant differences. 7.PP-333 and GA3 delayed heading 15 and 4 days, respectively, but NTN-821 showed no significant difference. 8.Yield was reduced by PP-333 and GA3, while yield of Gihobyeo treated with NTN-821 was increased about 6∼8%