Traditional Culture Encyclopedia - Traditional customs - Greenhouse light monitoring ~
Greenhouse light monitoring ~
(1) Uncover the straw cover in time to extend the light-seeing time. In winter, the sunshine time is short. In order to make full use of light energy, it is necessary to uncover the straw cover in time. Generally, as long as the sun shines, the grass should be torn open so that the leaves of crops can see the sun, carry out photosynthesis and produce organic nutrition. Grass mulching should be carried out before and after sunset to prolong the illumination time of crops and improve the utilization rate of light energy. In case of rain, snow or cold weather, the grass film should be pulled and uncovered in time. Generally, pulling the straw cover can be delayed by about half an hour compared with sunny days, and the straw cover can be covered about half an hour in advance. It is absolutely not allowed not to pull or uncover the grass film.
(2) Hanging reflective film and laying reflective film on the ground.
(3) North-South planting with wide and narrow rows: In order to make full use of light energy, North-South planting with wide and narrow rows should be implemented.
(4) Adjust the planting structure and density: First, strictly control the crop height, make the structure reasonable, and maintain a good group structure with low in the south and high in the north and uniform layout. The overall height of indoor population should be limited to no more than 2/3 of the height of greenhouse, so as to avoid the deterioration of lighting conditions and reduce photosynthetic efficiency.
Secondly, the planting density should be appropriately reduced in the northern part of the greenhouse, and the planting density should be gradually reduced from south to north in each row. For example, when planting tomatoes, the spacing between plants in the south is about 28 cm, the spacing between plants in the middle is about 30 cm, the spacing between plants in the middle and north is about 35 cm, and the spacing between plants in the northernmost part can be expanded to about 40 cm, so as to achieve uniform illumination among plants in the group.
(5) Improve the photosynthetic efficiency of crops.
(1) Select varieties with low light tolerance or more. Under the condition of low light, the crop varieties with low light tolerance still have strong photosynthetic efficiency and can obtain higher yield than those without low light tolerance.
② Spraying plants with "Tianda 2 1 16" and photosynthetic micro-fertilizer can obviously improve the photosynthetic efficiency of crop leaves and promote the yield increase.
(6) Artificial supplementary light should be used for greenhouse cultivation in high latitude areas, because the sunshine time is too short. Methods: Hang 1/3 energy-saving lamp or incandescent lamp at a distance of 40-60 degrees from the front slope every 2-3 meters, with the height of 1.5-2 meters off the ground, and cover it for lighting until 22 o'clock. If other areas encounter continuous rain and snow, artificial lighting should also be carried out, which can also achieve the purpose of increasing production and income.
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