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토양물리성 및 엽내 무기성분과 적과수준이 감 대봉 품종의 낙과에 미치는 영향
이상현,최현석,조정안,김월수 전남대학교 농업과학기술연구소 2000 農業科學技術硏究 Vol.35 No.-
This experiment was conducted on persimmon (Diospyros kaki Thunb) to study the cultural method reducing preharvest drop through analysis of the character of dropped fruit, thinning degree and the nutrient state of tree. Fifteen 10-year-old 'Hachiya' persimmom trees were used. Thinning were applied to one fruit per one twig (A treatment), one fruit per two twigs (B treatment) and one fruit per three twigs (C treatment) which had about six-leaf on 20 June. The number of fruit seed was investigated on dropped and harvested fruit on 20 June, 11 July and 1 Oct. Leaf analysis was conducted on both tree with heavy fruits drop and tree without fruit drop on 20 July, 1999. Preharvest drop rate with thinning degree tended to more decrease in B treatment and C treatment than in A treatment and harvest quantity of fruit was higher on B treatment than on C treatment. Preharvest drop rate seemed to be higher on the upper part of tree than on the lower part. The number of seed in fruit was about 2.1 per dropped fruit and 3.9 per harvested fruit, which showed the tendency that Preharvest drop was decreased in the fruit with many seeds. The tree with high preharvest drop rate has lower N, Ca, Mg concentration and higher Mn concentration within leaves than that with low preharvest drop rate. Thinning degree, setting point and the number of seed in fruit, the concentration of mineral nutrient in leaf had an effect on preharvest drop. Therefore we guessed that movement and supply of nutrient could affect preharvest drop.
전윤,차월석,권규혁,이동병 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1
In this study, we examined about effectives of the drug release by used glutaraldehyde amount and molecular weight varieties of chitosan in DDS. The release experiments of chitosan microspheres containing norfloxacin were operated in the phosphate buffer solutions of pH 7.4 and 37℃, and its results were as follows. In the linearly release time of drug, chitosan microspheres (Mw 190,000) of used glutaraldehyde 1 mL and 2 mL were 45 and 64 days, and chitosan microspheres (Mw 350,000) of used glutaralhyde 1 mL and 2 mL were 60 and 80 days relatively. These results showed more effective drug releases in the increments of molecular weight and glutaraldehyde In short, the formulation allows chitosan microspheres to suppress the burst effect of the drug release mechanism, which led to the controlled release pattern and microspheres