Correctly grasp the fertilization time
First of all, fertilization in early June may be appropriate for early and mid-maturing varieties such as Qinyang, the Weilao, and the United States. In the middle and late June, mid-late maturing varieties such as Hongxing, Jinguan, and early maturing Fuji (Yuhua Yufu, etc.) Can be fertilized; for late-maturing varieties and very late-maturing varieties, fertilization must be completed in mid-July, such as Fuji, pink girls and so on.
Rational use of fertilizers and formulas
The application of potassium fertilizer to apple should be supplemented by nitrogen and phosphate fertilizers, supplemented with appropriate calcium and magnesium elements and trace elements such as zinc and boron. The specific formula is best determined by the results of orchard nutritional diagnosis. For highland orchards in most areas such as Gansu, Shaanxi, Henan and Shanxi, apple special fertilizer (one of the Guoli expansion series) can be used. The balance between vegetative growth and reproductive growth of apple trees in summer can be effectively solved. On the one hand, coloration and quality of apples can be increased. On the other hand, flower bud differentiation can be promoted, and boron deficiency deficiencies and zinc deficiency lobular diseases can be well corrected. And other physiological and pathological.
The top dressing is mainly to solve calcium deficiency bitter disease, pox spot disease, water heart disease, rough surface cracks and other physiological diseases. Adhere to 10 to 15 days spraying a high-efficiency element in water-soluble calcium fertilizer, requiring effective active calcium content of more than 10%, it is best to use the Ministry of Agriculture formally registered in the middle of the element of water-soluble fertilizer. Remember not to spray high-nitrogen foliar fertilizers in the summer, such as amino acid foliar fertilizers, nitrate foliar fertilizers, etc. Calcium supplements also do not choose products without the Ministry of Agriculture's fertilizer registration, such as calcium chloride, calcium nitrate, various types of Registered calcium products are not allowed.
Appropriately control the amount of fertilizer
According to the specific tree size or the amount of results to determine the amount of fertilizer, if the yield per mu up to 2000 kg, then about 1.5 kg of fertilizer per plant. If the yield per mu is about 4000 kg, then fertilize about 3 kg per plant.
Scientifically grasp fertilization methods
Use ditch, hole, sprinkler and other measures. The depth of fertilization was determined by cultivation methods. The location of the fertilization should be in the area where the roots were concentrated. The depth of control was about 30 centimeters for deeper rooted Qiaohua cultivation patterns, and about 20 centimeters for shallow dwarfing root systems. After spraying on the ground, water is sprayed on the ground or micro-sprayed with a pipette, so that the fertilizer is dissolved and infiltrated to a depth of 20 to 40 cm. It can also be used after water-solubilization, or a water-soluble “fruit stand†apple special fertilizer is used.
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