June is the beginning of the hot summer season. Most of the vegetables cultivated in greenhouses and greenhouses are wintering vegetables or early spring vegetables. Their varieties are more resistant to low temperatures and light, and their heat resistance is relatively poor. How to improve the production in the middle and late period, without reducing the quality of the product, I believe that lowering the temperature is the key. First of all, from the cultivation and management of the varieties with less heat resistance, shade nets can be used to shave and cool. Such as tomatoes, kidney beans, leeks, celery and other crops, the use of shading 50% of the shade net to cover the flower Yin to reduce the temperature, or to take the mud on the large shed film approach, with thin mud thrown onto the film to form a flower Yin, under Heavy rain is thrown again. This is economic but more troublesome. The next step is to increase the amount of air flow. Open the air outlets at the bottom of the greenhouse and the roof vents to form air convection. Disperse the heat. It is best to set up a wind-proof membrane on the inside of the shelter when the wind is in front of the shelter. 60-80 cm, the bottom of the buried with soil, the top and the greenhouse film to leave a gap of 10 to 15 cm wide, open the front side of the greenhouse membrane ventilation, the wind from the top of the wind film through, that there is a good cooling effect, not Make the crops affected by strong winds. The third is scientific watering. Increasing the air humidity in the shed by watering is another key measure to reduce the temperature in the shed. 3 to 5 days to pour a water, each time the amount of watering should not be too large, it is necessary to dilute the small water, it is best to interlace or ridging ridge, so that although the water is poured more diligent, but the amount of watering is not too large, ie It can meet crop growth and reduce the temperature in the shed. The fourth is the combination of watering and topdressing, with the fertilization of water, according to different crops topdressing different fertilizers, melons and vegetables according to how much fertilizer to sit, that is, long pods and long melon crops, can be applied NPK The ternary compound fertilizer, if it takes more melons, may chase Shiluhong to fertilize A, or flush to fertilize B, and alternately apply 10~15kg per flush. If the growth is moderate, the amount of melons is not too much. You can also chase the fertilizer and pour water once. The fifth combination of spray spray leaf fertilizer, increase the air humidity and lower the temperature, for red clay sheds, because it is not easy to water after watering, it can not be over-watered, can be combined with spraying pesticides, spraying leaf fertilizer to increase air humidity . Solanum can prevent diseases and virus diseases. It can spray 60% Baitai 1200 times liquid, or spray 15% plant disease spirit 800 times liquid, combined with spraying calcium gali, gold carat, regenerative dew-surface fertilizer, if it is Leafy vegetables should be protected against downy mildew and soft rot. They can be sprayed with 45% chlorothalonil 600 times fluid, or 53.8% can be killed 2000 times, combined with spray rejuvenation, plant growth, or calcium galas. Force, etc., should be applied alternately with several foliar fertilizers to increase nutrient utilization. At the same time, it can improve the control effect of diseases.
Organic materials: also known as organic polymer materials, generally by C, H, O and other elements of the relative molecular weight of more than 100,000 (of course, there are other elements, such as S or P, etc.) generally speaking, solubility (divided into two kinds of swelling and dissolution), thermoplasticity (high temperature into the kind of viscosity) And thermosetting (seemingly low temperature and return to solid state), strength characteristics (than carbon or steel and other materials made of general strength is about twice its strength), electrical insulation, general organic materials have rubber, cellulose, protein, starch, high polymer, etc.
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