Effects of different shading-net on growth and quality of flowering Chinese cabbage.

摘要

Effects of shading on growth and quality of flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) were studied by different color shading-nets (red, grey, black and blue net, in which red, grey and blue net were manufactured by Polysack Plastics Industries, Israel) at November to December in Guangzhou, China. Under grey, blue, red and black net at 12 am, temperature decreased 5.81, 1.27, 3.93 and 8.58 degrees C, and the relative humidity increased 18.75, 18.32, 26.69 and 2.48%, respectively. Plant fresh weight increased 41.71 and 5.36% under red and blue net, while decreased 14.66 and 49.55% under grey and black net, respectively. And shoot fresh weight increased 43.80 and 9.00% under red and blue net, while decreased 12.81 and 48.62% under grey and black net, respectively. Plant height increased 16.25% under red net, however decreased 12.73, 33.01 and 47.50% under blue, grey and black net. Leaf area increased 41.44, 23.05 and 15.70% under red, grey and blue net, respectively. Under shading net, soluble protein and vitamin C concentration in leaf and flower stalk decreased, the reduction under red net was the least.