Most greenhouse vegetables require strong light conditions. Even in sunny days, the vegetables cultivated in the greenhouses are not enough. Especially in the rainy and snowy weather, the light is weaker, and the lack of light in the greenhouse is a common problem. . Insufficient light, vegetables can not only carry out more vigorous photosynthesis, transpiration is reduced, plant growth is weak, affecting the yield and quality of vegetables. This kind of weak light barrier caused by insufficient light, referred to as "low light syndrome". The general symptoms are: poor plant growth, soft stems; thin leaves, light color, easy to yellow; poor flower bud differentiation, floral deformity, serious falling flowers; slow fruit growth, light color, miso, poor coloration, etc. For example, under low light conditions, the amount of tomato pollen is reduced, the starch granules are also small, the germination rate of pollen is reduced, the style of the pistil is poorly developed, the fertilization ability is decreased, the unfertilized flower will fall off, the development of the fruit is inhibited, the weight of the single fruit is reduced, and the cavity is reduced. Fruit and fruit rot have increased. So how do you prevent "low light syndrome"?
Use high quality drip free film and keep it clean. The quality of the drip-free film will affect the light intensity in the shed, the high-quality non-drip film has high light transmittance, and it is not easy to be contaminated with dust; the inferior quality is not easy to be aging due to dripping film, and it is easy to be contaminated, and the light transmittance is also reduced. The light transmittance of the drip-free film also decreases as the use time increases. According to the measurement, the noon light transmission rate of the shed film can reach 93% within 13 days after the new high-quality no-drop film, and the light transmittance of the shed film at 73 days after the film is reduced to 81%. Therefore, it is necessary to scrub the shed film frequently to keep the shed film clean. When using the shed film for one year, the light transmittance is generally reduced by 30% to 40%. For greenhouse vegetables such as solanaceous vegetables and legumes, which are more strict in light intensity, it is better to replace the new high-quality non-drop film.
Covering the mulch. The mulching film generally has better temperature-enhancing, water-preserving and soil-sinking effects, and has a better "enhancement" effect. Due to the reflection of water droplets attached to the mulch film and the lower surface of the mulch film, the reflected light and scattered light near the ground can be enhanced by 50%~70%. For pepper, eggplant, tomato, etc., the light condition can be improved, and the soil temperature can be improved. . Among the mulch films, the milky white film and the silver gray film reflect more, the transparent film is centered, and the green and black films reflect less. In the growth stage of greenhouse vegetables, the previous period of lightening was obvious, and it was not obvious after sealing the ridge. Therefore, in the middle and the middle of the vegetable in the greenhouse, the temperature can be combined to cover the milky white film or the silver gray film (and the effect of driving the cockroach) or the transparent film.
Use reasonable cultivation measures. Some cultivation techniques can significantly improve the lighting conditions in the shed, such as the use of north-south rows of vegetables, appropriate increase of plant spacing, reduce shading between plants; melon vegetables, solanaceous vegetables, etc. through the pruning, smashing old leaves, timely Measures such as tying vines to adjust the light-receiving conditions of plants can play a better role in "increasing the light". In the middle and late stages of vegetable growth, when the temperature outside the shed reaches 15 °C before and after noon, some of the shed film is properly uncovered, allowing the sunlight to be directly injected into the shed.
Hanging the light curtain. According to the test, the polyester aluminized film is used to splicing into a 2 m wide and 3 m long reflective curtain, which is hung on the upper end of the plastic shed (or greenhouse) and the lower side hangs to the ground, which can increase the ground by 40%~43%. Increasing the temperature by 3 °C ~ 4 °C, the ground temperature increased by 1.8 °C ~ 2.9 °C, can increase the yield of tomato by 41.8% ~ 58.1%, and improve the fruit quality.
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