THE DESIGN AND APPLICATION OF A HYDROPONIC PRODUCTION LINE FOR VEGETABLE WITH DEEP FLOW TROUGHS MADE OF CEMBNT AND BRICKS

The hydroponic production line for vegetables was composed of two mainparts:the plantation troughs made of cement and bricks and the plastic greenhousefor insect protection and rain sheltering.The vegetable roots growed in a deeprecycling nutrient solution.The nutrient solution in the plantation system was stableand can provide enough water,nutrients and oxygen for root growth and itsrespiration. So the production line would be suitable for many crops to have highyields.The yield of tomata grown in autumn was above 120t/hm2 and the yield oflettuce in 30 days of growth was above 45 t/hm2.The production line ischaracterized by its low investment,durability,easy construction and management.ithas been extended to many cities in the Pearl River Delta and the extension areawas up to 20 000 m2 in Guangdong Province.