Nghiên cứu ảnh hưởng của nồng độ dung dịch dinh dưỡng đến sinh trưởng và năng suất cây cải bẹ trắng (Brassica rapa var. chinensis) trồng thủy canh

Abstract

The study was carried out at Can Tho University to determine the concentration of nutrient solution suitable for the growth and yield of white Pak Choy. The experiment was arranged in a completely randomized design with 7 replicates and 4 treatments with concentrations of nutrient solutions including: 600 ppm, 900 ppm, 1,200 ppm, and 1,500 ppm. The experiment was conducted in greenhouse conditions and passive hydroponic system was used to grow white Pak Choy. The results showed that the hydroponic nutrient solution concentrations affected the stem length, number of leaves, stem diameter, root weight, plant fresh weight, yield, and brix of white Pak Choy. The concentration of 900 ppm resulted in plant weight (180 g/plant) and commercial yield (4.41 kg/m²) higher than the concentration of 600 ppm (154 g/plant and 3.72 kg/m²) but was not statistically different from the concentrations of 1,200 ppm (183 g/plant and 4.48 kg/m²) and 1,500 ppm (163 g/plant and 3.89 kg/m²). However, the concentration of 600 ppm gave the highest white Pak Choy’s brix (3.46%). From the experimental results, it was initially shown that a concentration of 900 ppm can be used to grow white Pak Choy hydroponically while ensuring the same yield when using a concentration of 1,200 ppm.