2. The root system of apples is shallow, and it should be cultivated on sandy slope soil with loose soil slope, more organic matter, flat terrain, convenient irrigation and drainage, and pH value of 5.5-6.5. Due to the positive resistance of strawberries, it can be intercropped or interplanted with high-stalk crops or young fruit trees, suitable for cultivation in the garden. 15 days before the strawberry planting, it is necessary to carry out soil preparation, first squirting trifluralin herbicide, 200 g per 667 square meters. Then go deep into the ground, deep turn 30-40 cm, combined with 6,000 square meters of high-quality agricultural fertilizer 4000 kg, 15 kg of diammonium phosphate, 10 kg of potassium sulfate. Finally, the soil should be thinned and flattened to lay the foundation for doing sputum or snoring. When doing sputum, the scorpion is 10-20 meters long, 60-70 cm wide and 10 cm high. When snoring, the squat is 50-55 cm wide, the squat is 15 cm high, and the sulcus is 20 cm wide.
3, timely planting autumn planting can be carried out in the middle and late August, because the temperature and humidity are more suitable at this time, the strawberry can quickly seedling and enter the normal growth and growth. When planted on the sorghum, each row is planted 2 rows, the row spacing is 20 cm, the plant spacing is 1 cm, and about 10,000 square meters per 667 square meters. Leave a 30 cm aisle between the two. When planting, each planting 2 rows, line spacing 20 cm, plant spacing 15 cm, 9000 plants per 667 square meters. Problems that should be paid attention to when planting: It is best to choose rainy days or eye-catching plants in the evening. If you want to plant them deeply, you should not bury them, and the roots of the seedlings should be flush with the ground. If buried deep, it will suppress the growth point of the seedlings, it is easy to rotten seedlings, and reduce the survival rate; when the buried soil is too shallow, the exposed seedlings of the roots are easy to dry and die. When transplanting, pit the pit first, then put the seedlings into the pit, spread the roots, and then fill and water the plants until the seedlings grow new leaves.
4, post-plant management in order to make the seedlings grow well after colonization, promote the formation of flower buds, first, timely removal of the aging leaves and stolons on the plants; second, to apply nitrogen fertilizer in the second half of September, every 667 square meters It can be used for 15 kg of ammonium nitrate, and can be applied with appropriate phosphate fertilizer. The third is to timely irrigate the water. After each irrigation, it is necessary to cultivate once to keep the soil loose and increase the ground temperature, which is conducive to rooting of the seedlings.
5, disease prevention and control of strawberry in the process of growth and development, often occur gray mold, powdery mildew, leaf spot and the damage caused by red spider. For the prevention and control of gray mold, 0.3° lime sulphur mixture can be sprayed at the early stage of the disease; when powdery mildew and leaf spot disease are prevented, 800 times of solution can be sprayed with 800 times of solution or 800-1000 times of methyl thiophanate; When a red spider hazard occurs, 40% of the zhapod fruit emulsion 1200 times solution can be sprayed.
Valves are found in virtually every industrial process, including water and sewage processing, mining, power generation, processing of oil, gas and petroleum, food manufacturing, chemical and plastic manufacturing and many other fields.
People in developed nations use valves in their daily lives, including plumbing valves, such as taps for tap water, gas control valves on cookers, small valves fitted to washing machines and dishwashers, safety devices fitted to hot water systems, and poppet valves in car engines.
In nature there are valves, for example one-way valves in veins controlling the blood circulation, and heart valves controlling the flow of blood in the chambers of the heart and maintaining the correct pumping action.
Valves may be operated manually, either by a handle, lever, pedal or wheel. Valves may also be automatic, driven by changes in pressure, temperature, or flow. These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
More complex control systems using valves requiring automatic control based on an external input (i.e., regulating flow through a pipe to a changing set point) require an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately, and allowing control over a variety of requirements.
Stop Valves, Ball Cock, Angle Valves, Gate Valves, Check Valves
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