The effectiveness of soil moisture refers to whether the soil moisture can be absorbed and utilized by crops and how easy it is to use. When the soil moisture can not meet the needs of the crop, the crop will appear withering. The wilting coefficient is the soil moisture content when the crop is permanently withered, it is the lower limit of the effective moisture content of the soil, the water shortage is The concentrated performance of crop hazards is drought. According to the different causes of drought, it can be divided into atmospheric drought, soil drought and physiological drought. Among them, the frequent occurrence of soil drought in our city is characterized by a lack of effective moisture that can be absorbed and utilized in soil. Root water absorption can not meet the needs of normal transpiration and growth of crops, soil moisture content below the withering coefficient.
The monitoring and supervision of the soil moisture and drought management system found that the implementation of soil moisture monitoring technology not only saves water resources, reduces energy consumption, increases production and income, but also provides valuable experience for the sustainable development of agriculture in order to promote water-saving agriculture. At the same time, public sentiment surveys have become the basic work for resisting and defeating droughts. In the current extreme shortage of water resources, the contradictions between industry and agriculture are very fierce. If the drought comes, it is the peak period of agricultural water use.
Gate valve is usually used for shutting off or connecting the medium flow but not recommended for throttling action.
Nominal pressure of brass gate valves 1.6MPa and medium temperature for metal seal is -20â„ƒ~150â„ƒ. When the Gate Valve is used for saturated steam, the pressure of the saturated steam should beâ‰¤0.6MPa.
Gate Valve,Brass Gate Valve,Brass Lockable Gate Valve,Forged Brass Gate Valve
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