Before the apple fruit expands, nitrogen and phosphorus-based fertilizers are provided to ensure the normal development of green organs and form more green photosynthetic tissue. This period is called the nitrogen nutrition period; once the apple fruit enters the expansion period, the apple will be transformed from the nitrogen nutrition period During the sugar-forming nutrition period, attention should be paid to the supplementation of potassium, calcium, magnesium, boron and other nutrients during this period. While meeting the nutritional needs of green organs for photosynthesis, it is also necessary to promote the transport of these photosynthetic products to the fruit as much as possible.

Macronutrient fertilizer application

Take potash fertilizer as the main fertilizer, supplemented by phosphate fertilizer, and add nitrogen fertilizer in an appropriate amount according to the growth of the tree. There are many long shoots and thick, thick, dark green, shiny tree body that grows vigorously, each plant is applied with potassium sulfate 1 to 1.25 kg, and diammonium phosphate 0.5 to 0.75 kg; there are few long shoots, short new shoots and weak leaf color. Yellow-green trees with smaller fruits than the same period, each plant should be applied with potassium sulfate of 1 to 1.25 kg, diammonium phosphate 0.5 to 0.75 kg, and urea 0.15 to 0.25 kg.

Medium and trace element fertilizer application

Calcium fertilizer should be drained in time in the rainy season, and calcium fertilizer should be applied at the right time to promote the absorption of calcium by plants. Proper application of lime in acid soil orchards can neutralize soil acidity, increase the content of replaceable calcium in the soil, and reduce calcium deficiency.

Fertilizer application of fulvic acid diamine iron 200 times liquid, or amino acid iron fertilizer foliar spray, or 0.2% ferrous sulfate, iron citrate + 0.1% urea, or organic chelated iron liquid, etc.

For fruit trees with light magnesium deficiency in magnesium fertilizer, spray 1%～2% magnesium sulfate solution on the leaves for 1-2 times; for fruit trees with heavy magnesium deficiency, mix magnesium sulfate with organic fertilizer and apply magnesium sulfate 1～1 per mu. 1.5 kg.

Fertilization method

Ring furrow fertilization method This method is suitable for saplings to apply basal fertilizer. Dig a 30-40 cm wide and 15-25 cm deep ring-shaped ditch around the canopy, and then mix the topsoil and chemical fertilizer into it.

Strip furrow fertilization method: Dig 1 to 2 long strip furrows with a width of 50 cm and a depth of 15-25 cm between fruit trees or between trees, and then fertilize and cover the soil.

Radial ditch fertilization is to dig 6 to 8 radial trenches at a distance of 1 meter from the trunk, with a width of 30 to 60 cm, a depth of 15 to 25 cm, and a length reaching the outer edge of the trunk. Fertilizer is applied to the trench and covered with soil.

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