Light is an essential condition for photosynthesis of vegetables. Production practices have proven that supplementing the sheds with light in winter and spring can increase the yield of vegetables by 20% to 40%, and the quality of vegetables can be greatly improved. The main measures are as follows.
1, to improve the cultivation measures First, a reasonable mix of varieties. When planting different varieties of vegetables in the greenhouse, the layout is matched according to the principle of “lower in the north and higher in the southâ€; strict planting specifications are coordinated and the plant spacing is coordinated to make the plants grow neatly to reduce shading between plants. The second is using hangers. When cucumbers, beans, and other vegetables are cultivated in a greenhouse, the scaffolding is often severely shaded, and a thin film strip can be used as a hanger instead of a scaffold. The effect is good. Method: Fix a wire along the arch and insert a 30 cm long bamboo stick next to the cucumber or kidney bean root, and then tie the cut film strip vertically to the bamboo stick and wire, when the cucumber or the bean spreads. The vine is coiled around the film strip. In addition, if a scaffolding treatment is required, the practice of using the front row to the south, the middle row upright, and the rear row to the north can increase the utilization of light by about 15%. The third is timely pruning, destroy diseased leaves, insect leaves and old leaves, improve plant light transmission conditions.
2. Adhere to dust, water droplets, etc. attached to the membrane of the cleaning booth. A layer of water droplets is attached to the film to reduce the light transmittance by 30% to 40%. After five days, ten days and fifteen days of use of the new film, the light in the shed was reduced by 16%, 25%, and 28% due to the adhesion of dust. Therefore, we should insist on cleaning the film. After uncovering the cover curtains in the greenhouse every morning, the soft film is tied to the wooden poles to clean the dust and debris on the plastic film, which increases the illumination by more than 30%. Reduce water droplets on the film. A drop-free membrane canopy can be used, and the drop-free film surface has less water droplet adhesion and high light transmittance. Second, drip irrigation can be used to irrigate vegetables, which not only saves water, but also reduces the relative humidity in the shed by more than 10%, and reduces the condensation of water droplets on the shed film. The three can be immediately ventilated after the humidification, but to moderate, do not reduce the temperature of the greenhouse. Four in the morning with a clean rag to dry the film on the water droplets. In addition, when snow is encountered, the snow on the shed film must be promptly removed after the snow stops to increase the transparency of the shed film.
3. Use the reflective screen to add light and use the polyester aluminum film to spliced ​​into a reflective screen with a width of 2 meters and a length of 3 meters. Hang it on the upper end of the pillar after the plastic greenhouse, and hang it down to the ground to make the floor shine 35% to 42%. Increased 3 ~ 4 °C, the ground temperature increased 1.8 ~ 2.9 °C, cucumber yield increased 20% ~ 25%, tomato yield increased 35% ~ 40%. In addition, laying silver gray film on the ground can also increase the light intensity of the plant.
4, timely release curtain cover curtain is a common method of insulation, but after the curtain affects the greenhouse lighting. For this reason, according to the weather conditions, the curtains can be properly opened earlier and the cover curtains can be delayed to extend the lighting time in the greenhouse. The curtain is usually exposed 0.5 to 1 hour after the sun comes out. It is better to cover the curtain for 0.5 hours before the sun goes down. Cloudy days should also be exposed in a timely manner to increase the scattering of light. However, it is generally not suitable for the snow days to be uncovered.
1, to improve the cultivation measures First, a reasonable mix of varieties. When planting different varieties of vegetables in the greenhouse, the layout is matched according to the principle of “lower in the north and higher in the southâ€; strict planting specifications are coordinated and the plant spacing is coordinated to make the plants grow neatly to reduce shading between plants. The second is using hangers. When cucumbers, beans, and other vegetables are cultivated in a greenhouse, the scaffolding is often severely shaded, and a thin film strip can be used as a hanger instead of a scaffold. The effect is good. Method: Fix a wire along the arch and insert a 30 cm long bamboo stick next to the cucumber or kidney bean root, and then tie the cut film strip vertically to the bamboo stick and wire, when the cucumber or the bean spreads. The vine is coiled around the film strip. In addition, if a scaffolding treatment is required, the practice of using the front row to the south, the middle row upright, and the rear row to the north can increase the utilization of light by about 15%. The third is timely pruning, destroy diseased leaves, insect leaves and old leaves, improve plant light transmission conditions.
2. Adhere to dust, water droplets, etc. attached to the membrane of the cleaning booth. A layer of water droplets is attached to the film to reduce the light transmittance by 30% to 40%. After five days, ten days and fifteen days of use of the new film, the light in the shed was reduced by 16%, 25%, and 28% due to the adhesion of dust. Therefore, we should insist on cleaning the film. After uncovering the cover curtains in the greenhouse every morning, the soft film is tied to the wooden poles to clean the dust and debris on the plastic film, which increases the illumination by more than 30%. Reduce water droplets on the film. A drop-free membrane canopy can be used, and the drop-free film surface has less water droplet adhesion and high light transmittance. Second, drip irrigation can be used to irrigate vegetables, which not only saves water, but also reduces the relative humidity in the shed by more than 10%, and reduces the condensation of water droplets on the shed film. The three can be immediately ventilated after the humidification, but to moderate, do not reduce the temperature of the greenhouse. Four in the morning with a clean rag to dry the film on the water droplets. In addition, when snow is encountered, the snow on the shed film must be promptly removed after the snow stops to increase the transparency of the shed film.
3. Use the reflective screen to add light and use the polyester aluminum film to spliced ​​into a reflective screen with a width of 2 meters and a length of 3 meters. Hang it on the upper end of the pillar after the plastic greenhouse, and hang it down to the ground to make the floor shine 35% to 42%. Increased 3 ~ 4 °C, the ground temperature increased 1.8 ~ 2.9 °C, cucumber yield increased 20% ~ 25%, tomato yield increased 35% ~ 40%. In addition, laying silver gray film on the ground can also increase the light intensity of the plant.
4, timely release curtain cover curtain is a common method of insulation, but after the curtain affects the greenhouse lighting. For this reason, according to the weather conditions, the curtains can be properly opened earlier and the cover curtains can be delayed to extend the lighting time in the greenhouse. The curtain is usually exposed 0.5 to 1 hour after the sun comes out. It is better to cover the curtain for 0.5 hours before the sun goes down. Cloudy days should also be exposed in a timely manner to increase the scattering of light. However, it is generally not suitable for the snow days to be uncovered.
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