When photosynthesis is carried out by vegetables, there is a certain requirement for light intensity, which is attributed to light saturation point and light compensation point. The light saturation point is the light intensity that maximizes the photosynthesis of the vegetables; the light compensation point is the lowest light intensity that is the product of the photosynthesis of the vegetables and the consumption. The compensation measures for vegetable production in winter greenhouses are:
Structure
Adjust the structure that is to improve the structure of the greenhouse. It is best to use a non-drop film for the film, and a polyethylene film for the common film. In addition, whitening construction materials and walls can increase the reflected light and extend the service life; appropriately increasing the height of the greenhouse can also improve the lighting conditions in the shed. The orientation of greenhouses and the angle of greenhouses should be adjusted according to the greenhouse use time, production purpose and crop light conditions. In plastic greenhouses mainly cultivated in the spring and autumn, the shed angles can be smaller (15 or so), and the sheds are laid flat so that the transmitted light is evenly distributed and evenly distributed. In winter, the shed angle is larger (around 25). The shed was arched to facilitate lighting. Shed width and back slope width: winter production, shed width 6~6.5 meters, horizontal distance of backslope 0.8~1 meters, for light and heat preservation; spring and autumn production: shed width 8~9 meters, back slope horizontal distance 0.5~0.7 meters Or remove the back slope.
Turn way
The transfer method is to improve the planting method. When planting different varieties of vegetables in plastic greenhouses, they must be properly planted in accordance with the principle of "lower from the north to the south"; when sowing, the seeds should be oriented in the same direction, the cotyledons should be arranged in parallel when transplanted, and the planting specifications should be strictly controlled so that the plants grow neatly. , Minimize shading between strains. The east and the west were planted in the east and the west, and the north and the south were used in the winter and spring to make the plants evenly distributed. In addition, the strengthening of cultivation and management is also conducive to improving the light conditions in the shed; according to reports, the use of the cucumber row in the front row to the south, the middle row upright, the rear row to the north, can increase the light utilization rate of about 10%.
Vehicle Tools & Equipment,High Quality Vehicle Tools & Equipment,Vehicle Tools & Equipment Details, CN
Eastony Industries (NingBo) Co., LTD. , https://www.eastony.com