When we cultivate greenhouse plants, we have to consider many problems. First of all, we should consider how the photosynthesis of these greenhouse plants should be carried out. When we use energy-saving plant growth lamps, how to operate to make plants photosynthesis?
1. Light replenishment.
The minimum of illumination should be above the compensation point of light, otherwise flowers can not survive. The way to increase illumination is to use light.
If the irradiation distance is shortened, the illumination intensity can be reduced according to the inverse law of the square distance between the illumination intensity and the plant. For sake of economy, the white fluorescent lamp of 100-300 watts can also meet certain illumination conditions to meet the growth requirements of the plant. Plants are not burned when they are near plants. Only 10-12% of incandescent light is used as light and the rest is heat. Plants may be burned when they are near plants.
Plant bio-lamps are more suitable for supplying light to plants. Incandescent lamps are used to increase the length of sunlight and turn on the lights at midnight to prevent plants from forming flower buds in the long dark period. Incandescent light has long red light and is most effective in interrupting the dark period. Generally, when light is added at 20 to 2 o'clock at night, it can destroy the accumulation of flowering substances stimulated by plants in dark period. Fluorescent lamps have no long-wave red light to prevent the formation of flower buds and can not be used.
Shading trees can also be planted with shading curtains, shading yarns or in shade treatment. In order to shorten the length of sunshine and shade trees, materials such as black cloth, black paper and black plastic film can be used to create a dense and opaque environment. The selection of shading materials and shading time should take into account the temperature at that time. If the temperature is too high during shading, the normal growth of plants will be affected. Long. Shading time should be connected with night, that is, before sunrise or before sunset, so that flowers can differentiate flower buds in the long night.