Agricultural control: 1. Choose disease-resistant products. This is the most economical and effective way to control cucumber downy mildew. For example, greenhouses, greenhouse delay cultivation or greenhouse wintering cultivation, cucumber growth period is mostly the peak period, should choose the strong disease resistance of autumn shed No. 1, Jinza No. 1, Jinchun No. 3, Lu Cucu 10 and other varieties In the early spring cultivation of protected areas, it is necessary to select varieties such as Jinchun No. 2, Jinza No. 2, Zhongnong No. 5 and Lu Cucu No. 4 which are resistant to disease, low temperature, low light and premature. 2. Rational fertilization, scientific watering. Add organic fertilizer and apply it with reasonable formula of nitrogen, phosphorus and potassium fertilizer to cultivate strong seedlings and strong plants to improve the disease resistance of the plants. The melon is weak or the leaf color is light and should be sprayed with 0.2% urea and 0.3% potassium dihydrogen phosphate or photosynthetic micro-fertilizer. After pouring the planted water for about 7 days, it will not be watered, and the number of watering will be controlled from the slow seedling to the flowering period. The irrigation is carried out in the sunny morning, after which the shed can be closed, the room temperature is raised to about 30 °C, and the air is kept for 1 hour and then ventilated; the temperature drops below 25 °C, and then the temperature is raised once and then released, the disease prevention effect is better. . 3. Clean the countryside. Remove the diseased leaves and the bottom, yellow and old leaves of the plants in time. After harvest, all vegetable residues, leaves and weeds are removed in a timely and thorough manner. Remove all hosts from the germs to reduce the incidence of the disease.
Ecological control: 1. No drop film is selected. The drip-free film has the advantages of no dripping, heat preservation, light transmission and aging resistance, can reduce the humidity in the protection ground, and improve the lighting conditions, thereby achieving the control effect. 2. Hang the reflective screen. The reflective curtain is hung on the north side of the greenhouse spine to enhance light, increase temperature and reduce humidity. Generally, the temperature is increased by 1 to 2 ° C, and the relative humidity of the air is reduced by 3% to 4%. 3. Adopt sub-film drip irrigation technology. It adopts large ridge double row planting, inter-row filming, film watering, and conditional best under-film hose drip irrigation.
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Sealand meter is designed and produced according to world`s latest Coriolis technology with better appearance, stability and accuracy to measure mass flow rate of a fluid traveling through a tube, widely applied to alternative energy, oil & gas, chemical, food & beverage, industrial energy, marine, power, pulp & paper, water & wastewater industries, etc.
Mass flow meter measures the mass based on Coriolis effort. The operating principle involves inducing a vibration of the tube through which the fluid passes. The vibration, though not completely circular, provides the rotating reference frame that gives rise to the Coriolis effect. While specific methods vary according to the design of the flow meter, sensors monitor and analyze changes in frequency, phase shift & amplitude of the vibrating flow tubes. The changes observed represent the mass flow rate and density of the fluid.
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