How to Manage Greenhouse Vegetables in Foggy Days When it comes to cloudy days, increasing greenhouse lighting is a key way to increase production. There are four aspects to specific technologies:
First, it can promote the sun light fill technology. Generally 20 to 25 baht per mu. Ammonium sulphate For greenhouses where no sunlight is installed, the installation of electric lights can be used to fill the light and increase the temperature. Turn on the light in the morning and evening to increase the light of the vegetables, extend for 3 to 4 hours, and form 15 to 18 hours of light per day together with the sunlight, which can increase the yield by 10% to 40% and shorten the vegetative growth period by 17 to 21 days.
The second is to use a purple film. In the winter sun spectrum, ultraviolet light only accounts for about 5% of summer, white film can only pass through 57%, can not pass ultraviolet light, and purple light film can penetrate 88%. Ultraviolet spectrum can inhibit disease sterilization, control plant growth, and promote product accumulation. The room temperature before and after the winter solstice is 2 to 3 °C higher than that of the green film. Welcome to the company **http://
The third is the production of greenhouse vegetables, not afraid of cold, afraid of light, afraid of even cloudy days. Therefore, before and after the winter solstice, a light curtain can be hung on the back wall to improve the light intensity of the rear vegetable cultivation. At night, the heat stored in the wall can be slowly released into the room, which can maintain a higher temperature in the middle of the night to prevent freezing damage.
Fourth, the above conditions are not available. It is necessary to increase the natural light time as much as possible. In addition to paying attention to the addition of light in the greenhouse, there are two aspects to be noted: First, the leaf surface spray nutrients against cold. In the severe cold winter, the temperature is low, the light is weak, the root absorption capacity is weak, and the leaf surface is sprayed with micro-fertilizer (calcium nitrate), which can supplement the deficiency of the root system caused by insufficient nutrient absorption. Foliar sprayed rice vinegar can inhibit bacteria and deworming, mixed with white sugar and superphosphate, can increase the sugar content and hardness of the leaf meat, and improve cold resistance. When the plant is damaged by freezing and gas damage, the leaf surface will be atrophied. The vinegar can relieve the degree of damage. Generally, 100 to 300 times of liquid can be used. Use less or no growth hormones to prevent cold resistance. Second, in terms of management technology, it is appropriate to pick melons and pick melons early, and to reduce the excessive consumption of nutrients by continuous picking vegetables such as zucchini and tomato. It should be based on roots, preserved and life-saving, and try not to be too greedy. The use of cultivating insulation to prevent cold, due to the easy to slab in the greenhouse, the daytime hot air into the tillage layer is limited, the soil heat storage is less, combined with cracks in the soil, the pellet structure is poor, the first half of the night is easy to lose heat, the room temperature is low in the middle of the night, easy to cause freezing damage. Shallow cultivating can break the ground cracks, not only control the groundwater transpiration to take away heat, but also protect the cold and protect the cold. Then add carbon dioxide gas fertilizer. The ratio of carbon ammonia to crop yield increase is 1:1, and the crop's carbon to nitrogen ratio is 30:1. At present, most farmers have recognized the nitrogen production increase effect, but have neglected the carbon production increase effect. In winter, vegetables in greenhouses tend to grow yellow. When the sun comes out, the carbon dioxide produced by night crop respiration and soil microbial decomposition can be absorbed. At around 12 o'clock, it is in a state of carbon starvation. When the temperature is high, the membrane can be opened and closed. External carbon dioxide increases resistance and yield. When the temperature is low, the greenhouse is closed, and the carbon dioxide is artificially supplemented. For example, the carbon dioxide generator is used. The principle is that industrial sulfuric acid reacts with agricultural ammonium hydrogencarbonate to produce carbon dioxide; the carbon dioxide granular fertilizer is buried, and organic fertilizer is added to the soil, and the organic fertilizer passes through the decomposition energy. The release of carbon dioxide can enhance the cold resistance of crops and greatly increase production.
First, it can promote the sun light fill technology. Generally 20 to 25 baht per mu. Ammonium sulphate For greenhouses where no sunlight is installed, the installation of electric lights can be used to fill the light and increase the temperature. Turn on the light in the morning and evening to increase the light of the vegetables, extend for 3 to 4 hours, and form 15 to 18 hours of light per day together with the sunlight, which can increase the yield by 10% to 40% and shorten the vegetative growth period by 17 to 21 days.
The second is to use a purple film. In the winter sun spectrum, ultraviolet light only accounts for about 5% of summer, white film can only pass through 57%, can not pass ultraviolet light, and purple light film can penetrate 88%. Ultraviolet spectrum can inhibit disease sterilization, control plant growth, and promote product accumulation. The room temperature before and after the winter solstice is 2 to 3 °C higher than that of the green film. Welcome to the company **http://
The third is the production of greenhouse vegetables, not afraid of cold, afraid of light, afraid of even cloudy days. Therefore, before and after the winter solstice, a light curtain can be hung on the back wall to improve the light intensity of the rear vegetable cultivation. At night, the heat stored in the wall can be slowly released into the room, which can maintain a higher temperature in the middle of the night to prevent freezing damage.
Fourth, the above conditions are not available. It is necessary to increase the natural light time as much as possible. In addition to paying attention to the addition of light in the greenhouse, there are two aspects to be noted: First, the leaf surface spray nutrients against cold. In the severe cold winter, the temperature is low, the light is weak, the root absorption capacity is weak, and the leaf surface is sprayed with micro-fertilizer (calcium nitrate), which can supplement the deficiency of the root system caused by insufficient nutrient absorption. Foliar sprayed rice vinegar can inhibit bacteria and deworming, mixed with white sugar and superphosphate, can increase the sugar content and hardness of the leaf meat, and improve cold resistance. When the plant is damaged by freezing and gas damage, the leaf surface will be atrophied. The vinegar can relieve the degree of damage. Generally, 100 to 300 times of liquid can be used. Use less or no growth hormones to prevent cold resistance. Second, in terms of management technology, it is appropriate to pick melons and pick melons early, and to reduce the excessive consumption of nutrients by continuous picking vegetables such as zucchini and tomato. It should be based on roots, preserved and life-saving, and try not to be too greedy. The use of cultivating insulation to prevent cold, due to the easy to slab in the greenhouse, the daytime hot air into the tillage layer is limited, the soil heat storage is less, combined with cracks in the soil, the pellet structure is poor, the first half of the night is easy to lose heat, the room temperature is low in the middle of the night, easy to cause freezing damage. Shallow cultivating can break the ground cracks, not only control the groundwater transpiration to take away heat, but also protect the cold and protect the cold. Then add carbon dioxide gas fertilizer. The ratio of carbon ammonia to crop yield increase is 1:1, and the crop's carbon to nitrogen ratio is 30:1. At present, most farmers have recognized the nitrogen production increase effect, but have neglected the carbon production increase effect. In winter, vegetables in greenhouses tend to grow yellow. When the sun comes out, the carbon dioxide produced by night crop respiration and soil microbial decomposition can be absorbed. At around 12 o'clock, it is in a state of carbon starvation. When the temperature is high, the membrane can be opened and closed. External carbon dioxide increases resistance and yield. When the temperature is low, the greenhouse is closed, and the carbon dioxide is artificially supplemented. For example, the carbon dioxide generator is used. The principle is that industrial sulfuric acid reacts with agricultural ammonium hydrogencarbonate to produce carbon dioxide; the carbon dioxide granular fertilizer is buried, and organic fertilizer is added to the soil, and the organic fertilizer passes through the decomposition energy. The release of carbon dioxide can enhance the cold resistance of crops and greatly increase production.
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