Autumn corn is a high-quality and efficient late-autumn crop with wide adaptability, short growth period and rich nutrition. The main points of its pollution-free cultivation techniques are as follows:
First, the variety selection. Autumn corn should choose hybrid sweet corn or waxy corn with wide adaptability, strong disease resistance, short growth period, high quality and high yield, beautiful spike shape and good fresh ear.
Second, land selection. The land should be selected for the autumn harvest in the middle of July, which is harvested in mid-July, with deep soil layers and moderate fertility. However, it should not be planted on steep slopes, infertile land and soil with serious soil erosion.
Third, seedling transplanting. Autumn corn must be sown from late June to early July, and 2-3 days before planting, to early emergence, reduce the incidence of silk smut, while using lecitonic emulsion to seed the water to prevent underground pests. The seedling method adopts the fat group to raise seedlings, and the seedbed bed is moist and cool. When the seedling grows to the second leaf, it can be transplanted, planting 2000-2300 litters per mu, 2 seedlings per litter, paying attention to watering and drought after planting.
Fourth, fertilization technology. The basic principle of fertilization is to apply enough base fertilizer, increase the application of phosphorus and potassium fertilizer, apply seedling fertilizer early, apply joint fertilizer as appropriate, and reapply the attacking fertilizer. Generally, 30 kg of phosphate fertilizer, 8 kg of potassium fertilizer, 20 kg of ammonium phosphate or 7 kg of urea are used as base fertilizer. After cultivating and weeding, 5 kg of urea and phosphate fertilizer are applied to the seedlings. In the big bell mouth period, re-apply the attacking manure, and use 50 kg of ammonium bicarbonate or 15-18 kg of urea to ditch the soil to cover the soil, and clean the soil to protect the seedlings.
Fifth, pest control. In the trumpet period, the pyrethroid pesticide is sprayed with water 1000 times into the autumn corn heart leaf cluster to prevent the aphids and other hazards. The furan can also be mixed into the fine soil, or the bt emulsion is 150 ml per mu, and the water is 1 kg. Mix 15 kg of fine soil and make the poisonous soil into the bell mouth of the heart leaf cluster, but the pesticide must be stopped 15 days before harvesting.
Sixth, assisted pollination. In autumn, the density of corn is large and the flowering period is short. It is necessary to carry out artificial supplementary pollination 1-2 times, and its pollination time is 8:00 am.
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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