Most greenhouse vegetables need strong light conditions. Vegetables grown in greenhouses in winter and spring seasons are not even sunny enough, and the light intensity is still insufficient. Especially in cloudy and snowy weather, the light is weaker, and the lack of light in greenhouses is a common problem. . Due to insufficient light, vegetables can not only perform more vigorous photosynthesis, but also reduce transpiration, and the plants grow weak, affecting the yield and quality of vegetables. This kind of weak light barrier due to lack of light is referred to as "low light disease". The general symptoms are: poor growth of plants, thin stalks; thin leaves, light color, easy to yellow; poor flower bud differentiation, floral abnormalities, falling flowers serious fruit; fruit growth is slow, light color, astringent taste, coloring and other bad. For example, under low light conditions, the amount of tomato pollen is reduced, the starch grains are also small, the pollen germination rate is reduced, the style of the pistil is not well developed, and fertility is reduced. The unfertilized flower will fall off, the development of the fruit is inhibited, the weight of the single fruit is reduced, and the empty Fruit and fruit rot increased. So, how can we prevent "weakness"?

Use high-quality non-drop film and keep it clean. The quality of the non-drip film will affect the light intensity in the shed, the high-quality non-drip film has a high light transmittance, and it is not easy to contaminate the dust; the low-quality non-drip film is easy to be aged, easily polluted, and the light transmittance is also reduced. The drop-free film transmittance also decreases with longer use time. According to the measurement, the transmittance of the new high-quality no-drip film has reached 93% at noon after 13 days, and the light transmittance at noon has dropped to 81% after 73 days. Therefore, you should always scrub the film and keep it clean. The use of one year's shed film, the light transmittance is generally reduced by 30% -40%, for vegetables such as eggplant vegetables, legumes, vegetables and other light intensity requirements of the greenhouse vegetables, it is best to replace the new high-quality non-drop film.

Film cover. Plastic film coverage generally has better warming, water retention and soil consolidation effects, and has a better "lightening" effect. Due to the reflection of water droplets attached to the surface of the mulch and the mulch, the reflected light and scattered light near the ground can be enhanced by 50%-70%. For peppers, eggplants, tomatoes, etc., the lighting conditions can be improved, and the soil temperature can also be increased. . In the mulch, milky white and silver-gray films reflect more, the transparent film is centered, and the green and black films are less reflective. In the vegetable growing stage of the greenhouse, the previous medium-term lightening was obvious and it was not obvious after the ridge filling. Therefore, in the greenhouse in the greenhouse before the combination of warming, can be covered with a milky white film or silver-gray film (also the role of flooding) or transparent film.

Use reasonable cultivation practices. Some cultivation techniques can significantly improve the light conditions in the shed, such as the north-south direction of vegetables, increase the spacing of the plants, and reduce shading between plants; melon vegetables, eggplants, etc., through the pruning, removal of old leaves, timely Tie vines and other measures to adjust the plant light conditions, can play a better "grace" role. In the middle and late stages of vegetable growth, when the temperature outside the greenhouse reaches 15°C around noon, some of the shed films are properly opened so that the sunlight can be directly injected into the shed.

Hang a light curtain. According to the test, the use of polyester aluminum film spliced ​​into 2 meters wide, 3 meters long reflective screen, hanging in the plastic greenhouse (or greenhouse) after the upper end of the column, hanging down to the ground, the ground can be added 40% -43%, shed Temperature increased 3 °C -4 °C, ground temperature increased by 1.8 °C -2.9 °C, can increase tomato yield 41.8% -58.1%, and the fruit quality has improved.

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