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 is the transition period from vegetative growth to reproductive growth of broccoli. At this time, the growth rate of flower bulbs is accelerated, and the accumulation of nitrogen, phosphorus and potassium shifts to flower balls. 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 and phosphate fertilizer are generally used as base fertilizer before broccoli sowing and planting, and quick-acting nitrogen and potassium fertilizer can be used as top dressing in the middle of broccoli.
First, apply enough base fertilizer
Apply 3,000 to 5,000 kg of high-quality farmyard manure, 20 to 30 kg of ammonium sulfate, 35 to 40 kg of superphosphate, 25 kg of potassium and magnesium, 2 kg of borax, and 15 to 25 kg 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.
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Second, the soil topdressing Linyi Fertilizer Network Copyright
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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 5-8 cm, and watered. The third top dressing is carried out when the flower bud diameter reaches 12 to 13 cm. If there is too much rain, it should be applied with potassium fertilizer, and 15 kg of potassium sulfate or 45% of compound fertilizer of 205% of compound fertilizer should be applied per mu. Linyi Fertilizer Network Copyright
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Third, foliar spray fertilizer Linyi Fertilizer Network Copyright
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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. During the flower ball of broccoli, 0.3% potassium dihydrogen phosphate and 0.1% borax solution were sprayed appropriately, and sprayed once every 7 to 10 days, and sprayed 3 times, the yield increase effect was remarkable. Or after topdressing, soiling, weeding and peeling off yellow leaf disease leaves in the early stage of flower ball formation, spray the whole plant 1 or 2 times with 0.5% boric acid solution to improve the quality of the flower ball; when 50% to 60% of the plants When the flower ball is formed and reaches a diameter of 5 cm or more, the leaf surface is sprayed once with a 0.5% urea solution, and sprayed once more every 7 to 10 days. Linyi Fertilizer Network Copyright
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Fourth, the notes Linyi Fertilizer Network Copyright
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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. Linyi Fertilizer Network Copyright
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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. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
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. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
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