Soil Management Techniques for High Quality Cucumber Cultivation in Plastic Film Greenhouse.

In case of plastic film greenhouses cultivation fresh vegetables on paddy soil, soil characteristics must be considered as more important factor than any other factors. Generally after the four years of cultivation, soils tend to increase electrical conductivity value, nutrient unbalance and soil pests. As a result, degradation of agricultural products occurred, therefore it is necessary to improve soil conditions. In this study, yield and economic cost of cucumber were analyzed. The best soil conditions for cucumber cultivation were alluvial or valley in soil topology, moderately or poorly drainage in soil drainage classes, coarse loamy soil in texture. In addition, rich-sunlight and deep groundwater would be proper for the cucumber cultivation, Good environmental managements of plastic film greenhouse were as follows. The temperature needed to be adjusted three times. The optimal daytime temperature could be 22-28 celsius, the one from 12 until night could be 14-15 celsius, and the temperature from 24 to sunrise could be 10-12 celsius. During plant growth period, soil moisture content was as low as 10-15%, and it needed to be maintained as 15-20% during reproductive growth period. To control pests, catch crop cultivation and solar treatment were carried out, after those EC was reduced and the root-knot nematode was controlled too. Cucumber yield from the plot with improved soil managements increased to 158.4Mgha-1, but plot with successive cropping injury yielded 140.3 4Mgha-1 . The income from the plot with improved soil managements was 215,676 thousand won ha-1 ha, the plot with successive cropping injury was 131,649 thousand won ha-1 ha. Income rate of each plot was 51.8% and 38.4%, respectively.