Most vegetables require strong light conditions. However, in winter, especially in rainy and snowy weather, the light is weak. The lack of light in greenhouse vegetables is a common problem. Insufficient illumination not only fails to produce more vigorous photosynthesis, but also reduces transpiration, and plants grow weakly, which affects the yield and quality of vegetables. For example, tomato pollen dysfunction and infertility under low light conditions; eggplants appear short inflorescences and affect pollination; nutrient imbalances in vegetable plants such as sponge gourd and watermelon can cause fruit drop and fruit drop. Some experts call these phenomena "light hunger." How to prevent "light hunger"? Use high-quality non-drop film and keep it clean. The quality of the non-drop film will affect the light intensity in the shed, the high-quality non-drop film has high light transmittance, and it is not easy to contaminate the dust; the poor quality non-drop 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, within 13 days after the new high-quality non-drip film, the transmittance of the film at noon reached 93%. After 73 days, the light transmittance of the film was reduced to 81%. Therefore, economical scrubbing of the shed film and keeping the shed film clean is one of the important measures for greenhouse vegetables against “light hungerâ€. The use of a shed film for one year generally reduces the light transmittance by 30% to 40%. For melons and vegetables other than cucumbers and wax gourds, greenhouse vegetables such as solanaceous vegetables, vegetables, beans, etc. have strict requirements for light intensity. Production, it is best to replace the new high-quality non-drip film. Cultivation measures improve lighting conditions. Some cultivation techniques can significantly improve lighting conditions in the shed. For example, vegetables are used in the north-south direction. The large row spacing is the same as the small row spacing, so that all rows can get better lighting conditions; melon vegetables, eggplant vegetables, etc., through the pruning. , remove old leaves, vines in time and other measures, adjust the plant light conditions, can play a better "grace" role. 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 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 growing stage of greenhouse vegetables, the previous medium-term grace was obvious, and it was not obvious after sealing. Therefore, in the greenhouse before the combination of medium-term warming, can be covered with milky white film or silver-gray film (also the role of flooding) or transparent film. Use a reflective screen in the booth. In the greenhouse or south of the rear pillar Zhang Gui polyester film as a reflective screen, can significantly "grace." According to observations, the ground plane within 3 meters from the light curtain at 11 o'clock in the morning has an average increase in light intensity of 0.7 million lux over the shed without a light curtain, increasing the utilization rate of light energy by 25.2%; and measuring the light intensity at 1400 hours by 0.69 million lux. Increase the utilization of light energy by 23.4%. At the same time can increase the ground temperature 1 °C -2.5 °C. Specific use: In the first half of the first year of November, the curtain of light was opened and removed in mid-April of the following year. Hang the length as required, measure out two equal-length light curtains, and glue the two light curtains together with a transparent tape to form a 2-meter-wide banner. Pull the two east-west fine wires in the upper front of the column in the greenhouse. Wrap the upper and lower edges of the curtain back about 3 cm and fix it with a transparent tape or paper clip. The light curtain can also be directly fixed on the back wall (remaining vents must be left). Note: There must be a gap below the reflective screen to facilitate watering; places that are close to the light curtain should be properly watered; in a greenhouse, seedlings should be 50 cm away from the light curtain to prevent burning.
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