For our vegetable farmers, low temperature is really a headache. Once encountering cloudy weather, insufficient light becomes an important factor affecting the increase of vegetable yield. Weak light reduces the photosynthesis efficiency of plants, and the nutritional consumption of respiration proceeds normally. If this is the case, plants will inevitably die. Therefore, by increasing the light in the shed to ensure that photosynthetic production is greater than respiratory consumption, it is equivalent to solving the "survival crisis" of the plant.
Try to stretch the shed as much as possible
On cloudy days, vegetable farmers should make full use of scattered light. As long as the temperature conditions are acceptable and it does not rain, the vegetable farmers should open the shed to let the vegetables see the light. However, in order to ensure the temperature of the shed, it is recommended that the shed time is 0.5 to 1 hour later than the sunny day, and the afternoon shed time is 0.5 to 1 hour earlier than the sunny day. If the temperature of the shed drops rapidly after the shed, which exceeds 3 ~ 5 ℃, the shed may not be temporarily pulled.
Clean the film in time to improve the light transmittance of the film
Dust on the shed film will seriously affect the light transmittance of the shed film, especially the shed near the roadside. This situation is even more serious. Even on sunny days, it feels cloudy in the shed, let alone the light intensity. It's very cloudy. Therefore, taking measures to remove dust will greatly help to increase the light intensity in the shed on cloudy days. Vegetable farmers can remove most of the dust on the shed film by setting a dust cloth strip, and use a rag to remove the dust on the front face and the northernmost side of the shed film. In addition, we must also pay attention to reducing the condensation on the inner surface of the shed film, and reduce the influence on the light transmittance.
Hanging reflective curtain
On a cloudy day, it is possible to effectively increase the light intensity in the shed and increase the photosynthetic accumulation through the hanging of a reflective screen. The advantages outweigh the disadvantages. However, in some greenhouses, the reflective curtain is hung too low or the hanging angle is incorrect, and the vegetable plants are easy to block the light, and the use effect is poor. When hanging, the vegetable farmer can pull a wire from east to west along the walkway of the shed at a height of 2 meters on the back wall, cut two 1-meter wide reflective curtains as needed, and use transparent tape to bond to a 2-meter-wide curtain. The upper end of the curtain is folded back, wrapped with iron wire, and then fixed with transparent tape to form a curtain that hangs naturally or tilts slightly inside the shed. Do not hang it against the back wall, so that the reflected light will not illuminate the plants, and do not hang the entire back wall with a reflective curtain, to prevent the heat stored in the back wall from being reduced and the night temperature affected.
Install fill light to increase light
Conditional vegetable farmers can also install high-pressure sodium lamps, fluorescent lamps or iodine tungsten lamps in the shed to increase light. On cloudy days, you can turn on the light for 2 to 3 hours before and after noon to promote photosynthesis and avoid plant nutritional deficiencies, which affects the later growth.
Laying white mulch
The white mulch can reflect the light, and then direct the light to the leaves of the plant to promote the photosynthesis of the leaves. The black mulch does not have this function, because the black mulch absorbs light. Therefore, it is recommended to choose a white mulch when laying the mulch in the shed.
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