Apple swollen fertilizer to chase

Before the apple fruit is inflated, nitrogen and phosphorus-based fertilizers are supplied to ensure the normal development of green organs, and more green photosynthetic tissues are formed. This period is called nitrogen nutrition period; once it enters the expansion period, apples will be transformed from nitrogen nutrition period. Sugar vegetative period, therefore, this period should pay attention to the supplement of potassium, calcium, magnesium, boron and other nutrients, while meeting the nutrient requirements of photosynthesis of green organs, it is also necessary to promote the transfer of these photosynthetic products into the fruit as much as possible.

Large amount of elemental fertilizer application

Potassium fertilizer is the main factor, phosphate fertilizer is supplemented, and nitrogen fertilizer is supplemented according to the growth of the tree body. Long and thick, long, thick, green, lustrous trees with strong growth, 1 to 1.25 kg of potassium sulfate per plant, 0.5 to 0.75 kg of diammonium phosphate; less long shoots, short and weak new shoots, leaf color The yellow-green and fruit-like trees are smaller than the same period, and each plant is applied with potassium sulfate of 1 to 1.25 kg, diammonium phosphate of 0.5 to 0.75 kg, and urea of ​​0.15 to 0.25 kg.

Medium and trace element fertilizer application

Calcium fertilizer in the rainy season, timely drainage, timely application of appropriate amount of calcium fertilizer to promote the absorption of calcium by plants. Appropriate application of lime in acidic soil orchards can neutralize soil acidity, increase the content of replacement calcium in soil, and reduce calcium deficiency.

Iron fertilizer application of diammonium fulvic acid 200 times solution, or amino acid iron fertilizer foliar spray, or 0.2% ferrous sulfate, ferric citrate + 0.1% urea, or organic chelated iron liquid.

Magnesium-fermented fruit trees with lighter magnesium deficiency can be sprayed with 1% to 2% magnesium sulfate solution 1~2 times on the foliage; magnesium-salted fruit trees are mixed with magnesium sulfate into the organic fertilizer, and magnesium sulfate is applied per acre. 1.5 kg.

Fertilization method

Ring ditch fertilization method This method is suitable for applying basal tree fertilizer. An annular groove with a width of 30-40 cm and a depth of 15-25 cm is dug outside the canopy, and then the topsoil and fertilizer are mixed and applied.

Strip-shaped furrow fertilization method Between the fruit trees between rows or between plants, dig 1 to 2 strips of 50 cm wide and 15 to 25 cm deep, and then fertilize the soil.

Radiation ditch fertilization method digs 6-8 radial ditches 1 m away from the trunk. The ditch is 30-60 cm wide and 15-25 cm deep. The length reaches the outer edge of the trunk, and the fertilizer is applied to the ditch and covered with soil.

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