How to fertilize apple trees

The growth period of apples is generally 20 to 30 years, but the absorption of nitrogen, phosphorus and potassium in different periods and different ages is also different.

The apple tree is very sensitive to nitrogen. Excessive nitrogen will make the apple tree grow vigorously. The new shoots will be in a long state or stop growing, the canopy will be closed, the fruit will be mature and the quality will be poor. When nitrogen is insufficient, apples may suffer from malnutrition, delayed development of new shoots, sparse leaves, small fruit and easy to fall off. When there is too much phosphorus in the soil, it will inhibit the absorption of nitrogen, potassium and iron by the roots, and it will show chlorosis similar to iron deficiency. When the soil is deficient in phosphorus, the germination and flowering of the fruit trees will be postponed in the spring. After the germination, the branches will be weak and the new roots will be weak. At the same time, the fruit tree will weaken and the rot disease and fruit water heart disease will be easy. For apple trees in the fruiting period, for every 100 kilograms of fruit produced, 0.5 kg of nitrogen, 0.25 kg of phosphorus, and 0.5 kg of potassium should be absorbed.
Tianji brand phosphorus nitrate (potassium) fertilizer contains both nitrate nitrogen and ammonium nitrogen. Its nitrate nitrogen can promote the growth of new shoots. Ammonium nitrogen can increase the amount of flower bud differentiation. Rare earth fertilizer can not only increase the yield, but also increase the yield. Can significantly improve the quality of apples. Apple fertilization is mainly based on topdressing, divided into three periods: 1. Fall topdressing. Usually carried out after the leaves, each adult tree is applied to the Tianji brand of phosphorus nitrate (potassium) 1.5 kg. 2. Spring topdressing. Generally, it is carried out during the flower bud differentiation period, and each adult tree is applied to the Tianji brand of phosphorus nitrate (potassium) 1 kg. 3. The fruit is inflated during the period of topdressing. Generally carried out in mid-July, each adult tree is applied to the Tianji brand of phosphorus nitrate (potassium) 1.5 kg. The method of fertilization can be applied by acupoint application or spreading.

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