EFFECT OF LIGHT QUALITY ON THE GROWTH AND PHOTOSYNTHETIC CHARACTERISTICS OF CUCUMBER CUCUMIS SATIVUS L. UNDER SOLAR GREENHOUSE

In order to change and improve the light compose in the solar greenhouse, we supplied red, blue, UV-A and UV-B light in the solar greenhouse, the effect of the different light quality on the growth characteristics of cucumber growing in solar greenhouse were investigated. Being under different light quality (red, blue) the plant height, flower sprout differentiation and photosynthesis rate improved greatly, as for UV-A and UV-B the growth rate is lower compared with the control. The transpiration rate of cucumber leaf under red and blue light is higher compared with the other light UV-A and UV-B. When under UV-B light the stoma conduction, transpiration rate, and the CO₂ concentration between cells as well as the photosynthesis rate were decreased, at the same time the germinating rate, fresh and dry weight, plant height and flower differentia number all were restrained distinctly; while the stoma density and thickness of cucumber leaf were increased greatly.