The check valve is used in the piping system, its main function is to prevent the backflow of the medium, prevent the pump and its driving motor from reversing, as well as the release of the medium in the container.
Check valves can also be used to feed pipes where the pressure may rise to exceed the pressure of the main system. Check valve according to the different material, can be applied to a variety of media pipeline.
The check valve is installed on the pipeline, which becomes one of the fluid components of the complete pipeline. The opening and closing process of the valve disc is affected by the transient flow state of the system in which it is located. In turn, the closing characteristics of the disc have an effect on the fluid flow state.
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Appropriate amount of fertilizer to enhance the tree potential Rainy season, will cause loss of fertility. According to the loss of fertility of the land and the growth of the grapes, the amount of fertilizer should be increased according to the method of “less meals and more mealsâ€.
The topdressing of the roots is done with half the effort. It should be combined with spraying, and sprayed separately if necessary. 0.5% urea can be added when spraying Bordeaux mixture. When spraying the acid, add 0.5% urea and 0.3% potassium dihydrogen phosphate. It is also possible to spray reliable quality foliar fertilizer. The new fertilizer must be used in a large area after a small area trial.
Timely loosening soil and increasing soil permeability After heavy rain and heavy rain, the surface of the vineyard will be knotted, resulting in hypoxia, reduced resistance and easy infection of the bacteria. In the rainy season, we must grasp the rainy day gap and cultivate the vineyard to increase soil permeability.
Clean the secondary tips to facilitate ventilation and light. During the rainy season, the grapes are the most prolonged, and the incidence of secondary shoots is very high. It is necessary to pick the heart in time and wipe off the secondary tip. For plants with too many new shoots, a part of them should be removed to facilitate ventilation and light transmission and improve resistance.
Seeing the initial onset of the disease, timely treatment See the first symptom of the disease, that is, symptomatic spray, with 70% Kebo 600 times solution, 80% ethyl phosphate aluminum 300 times solution or 1:0.7:180 times Bordeaux mixture to prevent downy mildew.
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