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Summer cabbage disease is caused by soft rot under high temperature and humidity conditions. It can be sprayed with 50% carbendazim 500 times solution or agricultural streptomycin 1500-2000 times in the early stage. The initial stage of the disease is 1000 times of jinggangmycin. Liquid sprayed. Insect pests include Xiaolai moth, aphid, Laiwu and vegetable pulverized coal, which can be controlled by pyrethroids and nymphs.
Spring cabbage cultivation points:
Spring Chinese cabbage can be listed in April-May, overcomes the off-season in spring and summer, and increases the variety of flowers and colors. It has a certain role, but it must master special cultivation techniques to solve the convulsion caused by low temperature and long sunshine in early spring, and the short season is not necessary to make a ball. In order to obtain high quality and high yield.
1) Selecting the variety of spring Chinese cabbage in the growing season is higher than the autumn short balling period and the rain is high. The early maturing species with a short growth period of 60-70 days and strong winter and not easy to convulsion should be selected. Such as Beijing's Xiaobaikou, Jingza 55, Jinan Xiaobaixin, Xiamen's unparalleled and so on.
2) timely sowing, early avoidance of low temperature in the Yangtze River basin in early spring, low temperature, usually in early March, while South China can be covered in plastic sheds in mid-February, to prevent temperature below 15 °C, late in late March The temperature is not lower than 8-10 ° C, preventing the stage of passing through the low temperature vernalization.
3) The number of densely planted plants can be increased by 1-2 times compared with the general ones, so that the early twitching plants with obvious wax powder in the heart leaves can be removed, and eaten as green leafy vegetables, and the plants with late twitching are retained.
4) Applying quick-acting fertilizer, timely irrigation, rapid formation of rosette stage and leaf ball, inhibiting its development, making vegetative growth exceed reproductive growth and preventing convulsions.
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.
Heat-resistant summer Chinese cabbage cultivation - control of pests and diseases
Prevention of pests and diseases:
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