Studies on the water consumption and growth of vegetables cultivated by hydroponics in the green house.

In the vinyl house cultivation, the water consumption, evapotranspiration ratio, growth condition by the growing stages and yield of tomato and cucumber were investigated when they were cultivated by nutriculture, rice hull charcoal culture and NFT culture. The mean air temperature in the vinyl house during the experimental period was 1.9deg C higher than the outdoor air temperature, the maximum and minimum air temperature in the vinyl house was 4.6deg C and 1.7deg C higher than the outdoor temperature, respectively, and the mean daily evaporation in the vinyl house during the experimental period was 4.3mm that is 0.2mm more than the outdoor evaporation. In the tomato cultivation, the growth of rice hull charcoal culture was the best among the three methods, and the growth of NFT culture and nutriculture were worse than the soil cultivation which is standard, and among the nutriculture, the growth of EC 1.3m.mho plot was the best. In the cucumber cultivation, the growth of rice hull charcoal culture was the best, and while the growth condition of NFT culture was worse than the standard soil cultivation, the growth of nutriculture was better than the standard soil cultivation, and the growth of EC 1.3m.mho plot was the best among the different treatments in the nutriculture. In the tomato cultivation, the total water consumption of rice hull charcoal culture plot was 1107.5mm which is the highest amount among the three methods, and in the nutriculture, the total water consumption of EC 1.3m.mho plot was 221.4mm which is the highest among the three different treatments. In the cucumber cultivation, the total water consumption of rice hull charcoal culture was 1176.2mm which is the highest, and the total water consumption of EC 1.3m.mho plot was 284.9mm which is more than the 278.9mm of EC 1.5m.mho plot and 262.9mm of EC 1.7m.mho plot. The crop coefficient (Kc) of tomato was 0.82 in NFT culture, 4.67 in rice hull charcoar culture and 0.86-0.91 in nutriculture. The crop coefficient (Kc) of cucumber was higher than tomato as 1.13 in NFT culture, 5.20 in rice hull charcoal culture and 1.08-1.19 in nutriculture.