-Galactosidase was extracted and purified from strawberry. The purified -Galactosidase from strawberry was investigated their physicochemical characteristics. -Galactosidase was purified 25.74 fold from strawberry. The purification procedure include ammonium sulfate fraction, acetone powder treatment and gel and ion exchange chromatography. Yield of the enzyme purification was 18.11%. The purified enzyme has native molecular weight of 116,000 dalton. Vmax value and Km value of -Galactosidase were 0.077 mM ONPG/ml/15mim and 1.75x10-2mM, respectively. The optimum temperature and pH of -Galactosidase were 43C and pH 4.0, respectively. The -Galactosidase activity was stable below 50C and at pH 4.0 to pH 6.0. Among the metal ions Ca and Mg were did not affect, whereas K, Cu and Zn show a little effect on the enzyme activity. The -Galactosidase activities were inhibited by treatment with EDTA and SDS.

The use of artificially synthesized inorganic manure for the production of fruits and vegetables gives rise to soil contamination as well as noxious effects against human. Changes in quality of strawberry (SN) cultivated with a natural organic manure developed to solve such problems were studied during storage at 4C for 2 weeks. SN showed higher weight/volume ratio and lower weight loss during storage than strawberry (control) cultivated with commercial synthetic mature. Sweetness was higher in SN (9.2 Brix) than in control (8.2 Brix), and decrease in sweetness during storage was smaller in SN than in control. Redness (b) of strawberry was 32.1 in SN and 30.2 in control, and the redness decreased during storage showing 25.2 and 23.0, respectively, after 2 weeks. Hardness was higher in SN than in control, and decrease in hardness during storage was smaller in SN than in control. Vitamin C content was slightly higher in SN than in control, and mineral contents were generally higher in SN than in control.

Strawberry and cucumber were dipped with Korean medical herb extracts such as Rheum palmatum L. and Coptis chinensis Franch. to maintain the keeping quality during storage at 5C and 10C, respectively. Treatment with 500 ppm solutions gor strawberry retarded weight loss, microbial load increase, and decay during storage. Decay ratio was shown 68.8% for control, 45.0% for Rheum palmatum L. and 42.5% for Coptis chinensis Franch. at 10 days. Strawberry treated with Coptis chinensis Franch. showed a higher hardness and soluble solid content than others. Cucumber treated with 1,000 ppm solutions revealed a different O and CO concentrations after 16 days. Korean medical herb extracts showed an antimicrobial activity for the quality retention of cucumber during storage. Ascorbic acid content was generally increased till 8 days, but decreased thereafter.

To invedtigate the effect of refrigerate case on the Quality of strawberry during circulation, the temperature changes on the amounts of dry ice and ice cube were examined. And also, the effect of precooling on the changes in temperature and quality of the fruits were studied. Strawberry precooling-treated at 4 for 24hours was prolonged the shelf-life, and Quality was Progressed.150g of dry-ice Per kg of the strawberry was kept quality. It was prolonged more 2 days than present circulation system.

Circulation state and changes in quality during ripening of strawberry were investigated. Tissue damage of the fruit happened when it was harvested and selected. Strawberry has been harvested without considering of fruit temperature in the farm. It takes 25 hours from Goreung which is main production area of strawberry to retailer, and seasonal variation in the price was severe. Shelf-life of strawberry from Feb to Mar was 5-6 days, and was 24-30 hours from May to June. Desirable ripening stage was 28-30th day after blooming and 40th day and after this was over ripening stage when the degree of ripening estimated by color "a" value and color saturation. Overall eating quality and vitamin C contents and sugar content were more higher in the fruit of the desirable ripening stage than that of unripening and over ripening stage. The dark redness degree was high in the over ripening stage.

하우스 딸기 재배에 있어서 2, 4-D(아민감 40%)의 업면시용 효과를 알기 위하여 1 화방의 1번과 개화기(2월 11 일)에 10ppm 농도로 10 a당 120 를 처리하였던 결과, 1. 딸기는 엽병장 및 과경장이 길어지면서 상편생장을 하였고 잎과 과실로부터 에틸렌 생성이 증가되었다. 2 딸기는 에틸렌 생성 증가에 따른 수확최감기가 15일 정도 촉진되었고 과실비대로 1 과중이 증가되어 18 %의 증수 효과를 가져왔다.