Four periods of mango fertilization concentration for potassium, nitrogen and phosphorus mango

To produce 1000 kg mango requires 1.74 kg nitrogen, 0.23 kg phosphorus and 2.0 kg potassium, the most potassium, followed by nitrogen and phosphorus. Generally, nitrogen: phosphorus: potassium =1: 0.5: 0.5-1. However, for mango trees of different ages, different regions and different yields, the recommended fertilizer application often varies greatly, and should be adjusted appropriately according to the actual situation. Results Mango trees were fertilized mainly in four stages:

Mango fertilization

1. Fertilization. Mango flower bud differentiation period is 1 month before flowering, mango in Guangxi usually in December, fertilization before flower bud differentiation can promote mango flower bud differentiation. Mainly available nitrogen and potassium fertilizer, the dosage accounts for about 20% of the annual dosage, urea and potassium chloride are applied to each plant 0.1-0.2 kg (if simple phosphorus fertilizer is used, 1.6-1.8 kg calcium magnesium phosphate fertilizer can be applied to each plant). It can be combined with foliar fertilization, spraying 0.2-0.3% potassium dihydrogen phosphate solution until the foliar surface is covered with water droplets, and the dripping is not allowed. Spray 2-3 times continuously, with an interval of 7-10 days.

Second, strong flower fertilizer. Mango trees bloomed more and consumed more nutrients, so quick-acting nitrogen fertilizer should be applied once at flowering stage. Fertilization time depends on tree vigor, plant state and weather. Be sure to timely fertilization, mango trees with 50% of the last stage shoots bud fertilization is appropriate. Otherwise, if the tree is vigorous, the temperature rises, and fertilization is too early, it can induce excessive vegetative shoots or mixed flower buds to germinate and reduce flower quantity. Urea or compound fertilizer can be used as strong flower fertilizer. 0.1- 0.15 kg urea or compound fertilizer can be applied to each plant. 0.1% borax and 0.2-0.3% potassium dihydrogen phosphate solution can be sprayed on leaves.

If the application of fertilizer is sufficient, mango trees grow vigorously, this fertilizer can not be applied.

Third, strong fruit fat. Mango rapid growth and development period is about 30 days after flowering, during the rapid growth of young fruit, strong fruit fertilizer should be applied to meet the needs of mango development for nutrients. Generally, 0.3-0.4 kg urea and 0.2-0.3 kg potassium chloride are applied to the plant (if there is no phosphorus fertilizer in the flower fertilizer, 1.6-1.8 kg calcium magnesium phosphate can be applied in combination this time). It can be combined with foliar fertilization, spraying with 0.2-0.3% urea and potassium dihydrogen phosphate solution until the foliar surface is full of water drops and not dripping, spraying continuously for 2-3 times, and each spraying interval is 7-10 days.

4. Apply fertilizer to promote shoot growth before and after fruit picking. Mango fruit volume, consumption of nutrients, if not timely fertilizer, it will be difficult to restore the tree vigor, affecting the germination of autumn shoots. Fertilization before and after fruit picking is critical, and it is better to apply it twice. For the first time, urea 0.2-0.3 kg and potassium chloride 0.1-0.2 kg can be applied to the trees before and after fruit picking to promote the restoration of tree vigor and germination of autumn shoots as soon as possible. The second fertilization is when the last shoot starts to turn green, combined with soil turning, burying weeds, applying 25- 50kg organic fertilizer and 0.5kg ternary compound fertilizer to each plant. Can be combined with foliar spraying 0.3% potassium dihydrogen phosphate solution 1-2 times.

Fertilization methods: mainly ring ditch and groove method, cover soil after fertilization. (1) Circular groove fertilization: dig a circular or semi-circular groove with a width of 15-20cm on the outer side of the mango tree crown drip line. (2) Furrow fertilization: two parallel furrows, 20- 30cm wide and deep, are symmetrically dug on the outer side of mango tree crown drip every year, and the groove depth is more than 60cm when the hole is enlarged to improve soil.