The growth cycle of broccoli can be divided into germination stage, seedling stage, rosette stage, flower bulb growth stage, convulsion period, flowering stage and fruiting stage. During the cauliflower seedling stage, nitrogen is mainly concentrated in the leaves, and potassium is concentrated in the stems and petioles. 40 to 60 days after transplanting shift is a shift of cauliflower vegetative growth to reproductive growth, accelerated growth curd this time, nitrogen, phosphorus and potassium accumulation steering curd. Cauliflower seedlings need less nutrients. When raising seedlings, we should pay attention to the nutrient content of nutrient soil . We must use high-quality farmyard fertilizers, which require more nutrients during vigorous growth and product formation. Organic fertilizer base fertilizer and phosphate generally before sowing and planting broccoli, may be made available to recover nitrogen and potassium fertilizer in the middle of cauliflower fertility. First, apply enough base fertilizer Apply 3,000 to 5,000 kilograms of high-quality farmyard manure , 20 to 30 kilograms of ammonium sulfate , 35 to 40 kilograms of superphosphate , 25 kilograms of potassium and magnesium , 2 kilograms of borax , and 15 to 25 kilograms of potassium sulfate . After mixing the fertilizer with the farmyard manure, 60% will be applied to the sputum, and the remaining 40% will be applied to the ditch or the hole when transplanting. Second, soil topdressing Cauliflower needs to be topdressed 2 to 3 times from transplanting to harvesting . The first top dressing should be applied in a timely manner when the diameter of the flower ball is 3 to 5 cm, and 15 kg of ammonium sulfate per acre . 2 The second top dressing should be applied to the decomposed manure or chicken dung about 400 kg when the diameter of the flower ball is 5 to 8 cm , and watered. Third time when dressing bud diameter of 12 to 13 cm, if the case of too much rain, should be applied to the mating potash, potassium sulfate 15 kg per acre or 45% fertilizer 20 ~ 25 kg. Third, foliar spray fertilizer Plants rely mainly on the roots to absorb nutrients, and leaves and tender stems can also absorb nutrients directly from the solution sprayed on their surface. Appropriate during spraying of cauliflower curd 0.3% 0.1% potassium dihydrogen phosphate and borax solution, every 7 to 10 days, spray, even spray 3 times, yield significant results. Or after topdressing, soiling, weeding and peeling off yellow leaf disease leaves in the initial stage of flower ball formation, spraying the whole plant 1 to 2 times with 0.5% boric acid solution to improve the quality of the flower ball; when 50% to 60% of the plants curd is formed, and reaches more than 5 cm in diameter, with 0.5% urea solution foliar spray applied to 1 times, every 7 to 10 days and then spray a second. Fourth, matters needing attention 　　 1. Formula fertilization. Mainly organic fertilizer, supplemented by chemical fertilizers and trace element fertilizers, and vigorously strengthen formula fertilization. When topdressing, focus should be on using nitrogen fertilizer as leaf fertilizer, phosphate fertilizer as fruit fertilizer, and potassium fertilizer as root fertilizer. If a fertilizer is simply applied, it will have an adverse effect on the overall growth of broccoli. 　　 2. Scientific application of nitrogen. When broccoli lacks nitrogen fertilizer, the stems and leaves of the plants are narrow, the leaves are yellow, and the yield and quality are reduced. When the nitrogen fertilizer is sufficient, the plants grow vigorously, the leaves are dark green and high in yield. However, excessive application of nitrogen fertilizer can also cause a sharp increase in nitrate content in vegetables, which is prone to pests and diseases. In addition, the last time the broccoli is applied to the nitrogen fertilizer until the product is harvested, there must be a safe interval, which should be available on the eighth day after the last application of nitrogen fertilizer. 　　 3. Prevent boron and magnesium deficiency. Cauliflower is sensitive to elements such as boron and magnesium. When boron is deficient, it causes the center of the stem to crack. The flower ball has brown spots and a bitter taste. When the magnesium is deficient, the leaves are curled and the growth is slow.
Dosing and Metering Pumps Characteristic :
1 Clean and pollution-free: fluid only passes through and touches the Peristaltic Pump hose.
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3. Low shear force: It is an ideal tool for conveying shear-sensitive and corrosive fluids.
4. Corrosion resistance: it can transport various fluids, such as organic solvents and corrosive liquids.
5. Idling and dry operation: air or gas-liquid-solid three-phase mixed transportation can also be transported.
6. Possess self-priming ability: self-priming, no need to fill the pump, no need to empty.
7. It has the function of a shut-off valve, does not siphon, has no seals, and has the functions of a shut-off valve and a check valve.
8. Two-way conveying function: reverse pumping and back-suction functions can be realized by changing the direction of the pump runner.
9. Simple maintenance: only need to replace the peristaltic pump hose, no valve and seal replacement.
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