After apple fruit set, the young fruit is in a period of rapid development until the flower is divided within one month after flowering, and the nutrients stored in the tree body have been consumed for a year, and the leaves and spring shoots are growing rapidly. The demand for nutrients is large. Therefore, it is extremely important to add water and fertilizer during this period.
Ways to improve apple quality
Fruit type. After flowering to 25 days after flowering, it is an important period related to apple fruit type. In addition to the characteristics of the variety, the high degree of apple is also related to the temperature and nutrient supply in this period. If the temperature is high, it is not good for young. If the fruit grows longitudinally, if the nutrient supply is broken, it is not conducive to the longitudinal growth of the young fruit. Therefore, supplementing the water and fertilizer once in early May is conducive to the stretching of the fruit shape, which is conducive to the formation of large piles of large fruit.
Fruit. The receptacle of the apple flower organ will develop in the future. After the fruit setting, the number of cells in the receptacle is only about 2 million, and then the cells divide rapidly after obtaining sufficient nutrients, and after about two weeks of flowering, the cells can be split into a total number of cells. %, 40 days after flowering, the number of fruit cells has been basically determined and will not continue to divide. Therefore, if the nutrients after flowering are insufficient, it will affect the division of young fruit cells, except for the fruit shape, the fruit is also small.
What fertilizer is good after flowering?
During this period, the elements that need to be emphasized are nitrogen, calcium and boron, but the easily overlooked elements are phosphorus, potassium and zinc. Seeds and cell division are inseparable from phosphorus. Without phosphorus, cell division will be blocked, so flowers After this time, the fertilizer needs to be supplemented with nitrogen, phosphorus, potassium, calcium, zinc and boron.
Supplement time. Due to the occurrence of frost, hail and other disasters in many places this year, it has a great influence on the fruit setting. Therefore, it is recommended that the affected fruit farmers can make up the fruit before this year, and delay the work of fruit thinning. The fruit farmers who have not affected the yield, suggest early fruit thinning. Set the fruit early, and fertilize immediately after the fruit is fixed. The fertilization should not be delayed until two weeks after the flowering.
Supplementary quantity. It is recommended to apply 20-20 kg of 20-20-20 water soluble fertilizer, plus 10-20 kg of medium and trace element functional fertilizer containing amino acid and humic acid. For apple fruit farmers, it is not recommended to apply water-soluble fertilizer with a unit price of more than 10 yuan per kilogram. Due to the perennial large crown crops and complicated soil conditions, the super-quality water-soluble fertilizer has low cost performance, but it is not recommended to apply ordinary compound fertilizer, and the utilization rate of common compound fertilizer. Low, harmful to the soil.
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