RESEARCH ON GROWTH ABILITY AND QUALITY OF SOME LETTUCE SPECIES IN THE CONTINUOUS FLOW HYDROPONIC SYSTEM IN THAI NGUYEN

Abstract

The experiment was conducted at the greenhouse of Faculty of Agronomy, Thai Nguyen University of Agriculture and Forestry to determine the lettuce varieties showed good growth ability, high quality and yield adapted to continuous flow hydroponic system. The experiment was designed in Randomized Complete Blocks Design (RCBD) with 4 replications. The results of 4 varieties of lettuce: Dam, Dun Vang, Xoan San Cao and Xoan Tim showed that all varieties had good growth ability in the continuous flow hydroponic system in Autumn-Winter crop in Thai Nguyen; Dun Vang variety had the highest net yield of 358.9 kg/100 m², the best quality (vitamin C reached 2.97 mg /100g, Brix reached 2%) and low NO₃^- residue (100 mg/kg) compared to the other varieties, the highest economic efficiency, profit 4,528,000 VND / 100 m².