Before the apple fruit enlargement, nitrogen, phosphorus-based fertilizers are supplied to ensure the normal development of green organs and form more green photosynthetic tissues. This period is called the nitrogen nutrition period; once it enters the expansion period, the apple will be transformed from the nitrogen nutrition period. Sugar-nutrition period, therefore, should pay attention to potassium, calcium, magnesium, boron and other nutrient supplements in this period, while meeting the nutritional needs of green organs for photosynthesis, but also to promote these photosynthate products as much as possible transported to the fruit.
Large amount of fertilizer application
Potassium-based fertilizers are mainly supplemented with phosphate fertilizers, and appropriate nitrogen fertilizers are added according to the growing conditions of the trees. The long shoots are thick and thick, and the thick, dark green and shiny trees grow robustly. Each plant has 1 to 1.25 kg of potassium sulfate and 0.5 to 0.75 kg of diammonium phosphate. The long shoots are short, the shoots are short and weak, and the leaves are colored. Yellow-green, fruit a smaller than the same period of the tree, each plant potassium sulfate 1 ~ 1.25 kg, 0.5 ~ 0.75 kg of diammonium phosphate, urea 0.15 ~ 0.25 kg.
Application of trace elements in fertilizers
In the rainy season, calcium fertilizer is drained in time, calcium fertilizer is applied in a timely manner, and calcium absorption is promoted. Appropriate application of lime in acidic soil orchards can neutralize soil acidity, increase the amount of displaceable calcium in the soil and reduce calcium deficiency.
The iron fertilizer is applied with 200 times dilution of iron ferrous fulvic acid, or iron leaf fertilizer with amino acid, or 0.2% ferrous sulfate, iron citrate + 0.1% urea, or organic chelated iron liquid.
Magnesium-deficient Mg-deficient fruit trees can be sprayed with 1%-2% magnesium sulphate solution for 1 or 2 times on the foliage; magnesium-heavy fruit trees are mixed with magnesium sulfate in the organic fertilizer and applied at the root of magnesium fertilizer per gram. 1.5 kilograms.
Fertilization method
Round-groove fertilization This method is suitable for sapling basal fertilization. Dig a 30 to 40 centimeter wide and 15 to 25 centimeter deep groove in the periphery of the crown and mix the topsoil and fertilizer.
Strip groove fertilization in the fruit trees or between plants, digging 1 to 2 50 cm wide and 15 to 25 cm deep strip groove, and then fertilize the soil.
The radiation groove fertilization method digs 6 to 8 radial grooves at a distance of 1 meter from the trunk. The groove width is 30 to 60 centimeters, and the depth is 15 to 25 centimeters. The length reaches the outer edge of the trunk, and the fertilizer is applied to the groove to cover the soil.
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