For trees planted in the spring of last year, organic, phosphorus, and potassium fertilizers needed to be applied in the fall of the same year during the digging of the root zones. If this was not done in the fall, they should be applied this spring.
Organic fertilizers recommended include manure at a rate of 6-10 kg per 1 m² of the tree's root zone. Phosphorus, potassium, and nitrogen fertilizers are applied at a rate of 15-25 g per 1 m².
The calculation of the required amount of fertilizers is done as follows. At the age of one year, the diameter of the tree's root zone is 2 m². Thus, if 10 kg of manure is required per 1 m², for one one-year-old tree it will be 10 kg x 2 = 20 kg of manure. Nitrogen fertilizers are applied at a rate of about 20 g per 1 m², which for one tree will be 20 g x 2 = 40 g, phosphorus – 40 g x 2 = 80 g, potassium – 15 g x 2 = 30 g.
Thus, for each tree, it is necessary to apply 20 kg of manure, 40 g of nitrogen, 80 g of phosphorus, and 30 g of potassium fertilizers.
