For each 1000 kg of fresh mangoes, 1.74 kg of nitrogen, 0.23 kg of phosphorus and 2.0 kg of potassium are required. The most needed is potassium, followed by nitrogen and phosphorus. Production is generally applied as nitrogen: phosphorus: potassium = 1:0.5:0.5-1. However, the recommended fertilization amount of mango trees with different ages, different regions and different yield levels tends to vary greatly, and should be appropriately adjusted according to local conditions. Mango fruit trees are fertilized mainly in four periods:
First, the flower fertilizer. One month before flowering, the flower bud differentiation period of mango was observed. The flower bud differentiation period of Guangxi mango was generally in December. Fertilization before flower bud differentiation promoted flower bud differentiation. Fertilizer should be based on available nitrogen and potassium fertilizers. The dosage is about 20% of the annual dosage. Each plant applies 0.1-0.2 kg of urea and potassium chloride. (If the phosphate fertilizer is used as the elemental phosphate fertilizer, the fertilization can be applied in this fertilization. Next, generally apply 1.6-1.8 kg of calcium and magnesium phosphate per plant). It can be combined with foliar fertilization, sprayed with 0.2-0.3% potassium dihydrogen phosphate solution, sprayed to the leaf surface covered with water droplets, and the droplets are not dripped, and sprayed continuously for 2-3 times, each spraying interval is 7-10 days. .
Second, strong flower fertilizer. The mango tree has a large amount of flowering and consumes a lot of nutrients. The quick-acting nitrogen fertilizer should be applied once during the flowering period. Fertilization time depends on tree potential, plant status, and weather. However, it is necessary to fertilize at the right time, and it is advisable to start fertilization when 50% of the last stage branches of the plant are budded. Otherwise, if the tree is prosperous, the temperature rises, and fertilization too early can induce excessive vegetative shoots or mixed buds to reduce the amount of flowers. Zhuanghuafei can be used with urea or compound fertilizer. Each plant is applied with 0.1-0.15 kg of urea or compound fertilizer. It can be sprayed with 0.1% borax and 0.2-0.3% potassium dihydrogen phosphate solution. If the application of the flower fertilizer is sufficient, the plant grows vigorously, and this time the fertilizer can not be applied.
Third, strong fruit fertilizer. About 30 days after Xiehua is the period of rapid growth and development of fruit. During the rapid growth of young fruit, it is necessary to trace the strong fruit fertilizer to meet the nutrient needs of fruit development. Generally, 0.3-0.4 kg of urea is applied per plant, and 0.2-0.3 kg of potassium chloride is applied. (If there is no combined application of phosphate fertilizer in the flowering fertilizer, this time it can be combined with the application of calcium magnesium phosphate fertilizer 1.6-1.8 kg). It can be combined with foliar fertilization, sprayed with 0.2-0.3% urea plus potassium dihydrogen phosphate solution, sprayed onto the leaf surface covered with water droplets, and the drop is not allowed to drip, continuous spraying 2-3 times, each spraying interval 7- 10 days.
Fourth, before and after fruit picking and promoting the shoot and strong fertilizer. Mango has a large amount of fruit and consumes a lot of nutrients. If it is not supplemented with fertilizer in time, it will be difficult to restore the tree potential and affect the sprouting autumn shoots. Fertilization before and after fruit picking is very important, and it is better to apply it twice. For the first time, before the fruit picking, 0.2-0.3 kg of urea per plant and 0.1-0.2 kg of potassium chloride can be applied to promote the restoration of the tree potential and sprout the autumn shoots as soon as possible. In the second fertilization, when the last tip began to turn green, the weeds were buried in combination with the soil, and 25-50 kg of organic fertilizer and 0.5 kg of ternary compound fertilizer were applied to each plant. The 0.3% potassium dihydrogen phosphate solution can be sprayed 1-2 times in combination with the foliage.
Fertilization method: The soil fertilization mainly adopts the annular ditch and the ditch method, and the soil is applied after the application.
(1) Round groove fertilization: dig a circular or semi-annular groove on the outside of the canopy drip line, with a width of 15-20 cm.
(2) Grooved fertilization: Rotate two parallel grooves in the outer side of the canopy dripping water every year, the width is 20-30 cm, and the depth of the ditch is 60 cm or more when the hole is changed.
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