Correctly grasp the fertilization time
First of all, in early June, fertilization can be appropriate for early-maturing varieties such as Qinyang, Qila, Meiba, etc.; in mid-late June, mid-late maturing varieties such as Red Star, Golden Crown, and Early-maturing Fuji (Yuhua Zaofu, etc.) Fertilization; for late-maturing and very late-maturing varieties, fertilization must be completed in mid-July, such as Fuji and Pink Girls.
Rational use of fertilizers and formulas
Fertilization of apples should be supplemented by potassium fertilizer and nitrogen and phosphorus supplements. Appropriate supplementation of calcium and magnesium intermediate elements and trace elements such as zinc and boron. The specific formula is best determined by the nutritional diagnosis results of the orchard. For plateau orchards in most areas such as Gansu, Shaanxi, Henan, and Shanxi, you can use special fertilizer for apple expansion (one of the series of fruit expansion). It can effectively solve the problem of balance between vegetative growth and reproductive growth of apple trees in summer. On the one hand, it can increase apple coloration and improve quality, on the other hand, it can promote flower bud differentiation, and better correct boron deficiency and fruit deficiency and zinc deficiency lobular disease. And other physiological pathology.
Root dressing mainly solves physiological diseases such as calcium deficiency bitter pox disease, acne spot disease, water heart disease, and rough surface cracks. Adhere to a high-efficiency medium-quantity water-soluble calcium fertilizer sprayed for 10 to 15 days, requiring an effective active calcium content of more than 10%. It is best to use a medium-quantity water-soluble fertilizer officially registered by the Ministry of Agriculture. Remember not to spray foliar fertilizer with high nitrogen content in summer, such as amino acid foliar fertilizer, nitrate foliar fertilizer, etc., do not choose calcium without fertilizer registration, such as calcium chloride, calcium nitrate, various types. Registered calcium supplements are not allowed.
Properly control the amount of fertilizer applied
According to the specific tree size or the amount of results, the amount of fertilizer is determined. If the yield per mu can reach 2000 kg, the fertilization of each plant is about 1.5 kg. If the yield per mu is about 4,000 kg, then about 3 kg of fertilization per plant.
Scientific mastery of fertilization methods
Measures such as ditch application, hole application, and water spray are applied. The depth of fertilization should be determined by cultivation method. The fertilization position should be concentrated in the root system. The depth control of the deep rooted Qiaohua cultivation mode is about 30 cm. For the dwarf cultivation mode with shallow root system, the depth is about 20 cm. After spraying on the ground, spray water with water spray or drip tube micro-sprinkling, so that the fertilizer can be dissolved and infiltrated to a depth of 20 to 40 cm. It can also be applied after water-soluble, or use a water-soluble "fruit-expanded" apple special fertilizer.
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