Effects of Planting Density on Agronomic Traits and Yield of Bolting-type Non-heading Chinese Cabbage Qingtai 1

To provide a scientific basis for high-yield and high-efficiency cultivation of stalk-usable common Chinese cabbage, a field experiment was carried out using the cultivar Qingtai No.1 as test material to investigate the effects of different planting densities on agronomic traits and yield of stalk-usable common Chinese cabbage. The results showed that planting density exerted little effect on the growth period of Qingtai No.1. Regular variations were observed in plant width, main stalk diameter and lateral stalk number per plant: plant width and main stalk diameter decreased with the increase of planting density, and the number of lateral stalks per plant also declined as planting density rose. The treatment D with plant-row spacing of 15.8 cm × 18.2 cm achieved the highest main-stalk yield of 22 261.5 kg·hm⁻², with a 6.9% increase in total yield compared with the control, which was suitable for the cultivation mode of one-time harvesting of main stalks. The treatment B with plant-row spacing of 24.1 cm × 24.2 cm produced prominent lateral-stalk yield（15 760.5 kg·hm⁻²）and obtained the maximum combined yield of main and lateral stalks（35 214.0 kg·hm⁻²), 12.2% higher than the control. This density was applicable to the production mode for successive harvesting of lateral stalks after main-stalk harvest.