First, do a good job forecast: autumn and winter vegetable production, typhoon, heavy rain, high temperature, drought, high incidence of pests and diseases, late autumn frost, winter and spring cold damage, freezing, rain and snow disasters, etc. occur from time to time. The agricultural departments of all localities should actively communicate with the meteorological departments, do a good job in forecasting and forecasting, and make precautions.
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II. Responding to droughts and floods: In the near future, rainfall in the southwest and south China areas has occurred. Some vegetable fields have been stained with water. It is necessary to pay attention to the clearing of the ditch, timely eliminate the water in the field, and adopt deep sorghum (ridge) to prevent the occurrence of waterlogging hazards. Other areas should also pay attention to the problem of waterlogging caused by short-term heavy rainfall. Jiangnan and South China should also pay attention to defending against high temperature and drought. In North China and Northwest China, attention should be paid to prevention of drought in autumn and winter.
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Third, coping with the strong wind: In order to prevent the wind damage, the facility film should be pressed with a filming rope to prevent the film rope from grinding the film. Before the arrival of strong winds, the fixed ropes of the outer insulation coverings (grass, insulation, the same below) should be strengthened. At the same time, the vents and doors and windows should be sealed to prevent the wind and damage to the installation film and insulation covering materials.
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Fourth, deal with heavy snow: In the case of snowy weather, the surface of the insulation cover of the facility is not smooth and should be covered with film, and the snow on the facility should be removed in time. For facilities with unsturdy skeletal structure, some columns should be prepared in advance. In case of a large number of icy rains and snows that are difficult to remove, a row of columns can be added 3 meters away from the front of the greenhouse to prevent the front roof facilities from collapsing.
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V. Coping with continuous low temperature and low light: In the winter and spring seasons, the low temperature and low light caused by continuous rain, rain, snow, fog and haze will have a great impact on the production of greenhouse vegetables. Pay attention to listening, watching weather and air quality forecasts, stop watering before continuous rain, snow, fog and smog, and minimize ventilation and storage, and properly strengthen insulation measures. During the continuous rain, snow, and smog, as long as there is no rain or snow, the scattered light should be revealed before noon. If necessary, artificial light can be used for plant growth lamps, LED lamps, iodine tungsten lamps, sodium lamps, and the like. If the night temperature is too low, an electric heating fan, a solid combustion block, etc. should be used for emergency warming.
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At the same time, it is necessary to pay attention to the removal of old leaves and diseased leaves, and concentrate on harmless treatment. When the yin is exposed to the sun, the insulation cover can not be completely uncovered at one time. The cover of the grass cover should be separated by one piece. The overall insulation is to be rolled up halfway. Gradually increase the light seeing area, and find that the leaves of the plant are wilted and should be covered. Covering, after the plants return to normal, gradually uncover them to prevent dehydration and necrosis of stems and leaves. When the plant no longer shows obvious wilting, spray water, nutrient solution ( 0.2%-0.3% urea and potassium dihydrogen phosphate mixture) or amino acid foliar fertilizer which is basically the same as room temperature , and promote the plant to resume growth.
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Sixth, dealing with extreme low temperatures
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In winter, there is a strong cooling, and even a cold winter climate, which is a great hazard to the production of vegetable facilities. To this end, the facilities of vegetables in the cold season should adopt appropriate high temperature management to maximize heat storage and protect against cold. Before the onset of strong cooling, it is necessary to keep the facilities closed, and strengthen the cover insulation. If necessary, emergency measures should be taken to prevent frost damage.
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A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.
Ball Cock, Brass Ball Bibcock, Ballcock Valve, Toilet Ballcock Valve
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