A RECIRCULATING HYDROPONIC SYSTEM WITH PERLITE AND BASALTIC TUFF
Nutrient solution in the catchment tank was recirculated by a submersible pump. Catchment and header tanks were insulated against temperature fluctuations. Water supply and pH adjustment were daily works. Nutrient addition intervals were 3–15 days.
Sum of class 1 and class 2 tomato yields were between 0.5–7.2 kg/plant (1.5–20.7 kg/sqm). Numbers of class 1 cucumbers were between 15.2–32.7 per plant (43.1–92.9 per sqm) by years.
Vegetative growth and attraction of geranium and dwarf chrysanthemum were improved substantially in hydroponic system. Flowers were denser, brighter and larger than those grown in soil.