Apple fruit development and quality of the formation

Apple fruit is developed from the ovary and receptacle fake fruit, which results ovary development heart development achievements meat receptacle, embryo develop into seeds. The volume of fruit enlargement, early rapidly dividing cells by cell number increased, the latter part of the enlargement by cell volume.
Volume of fruit enlargement, before the mid-mature faster, slower early and late, one month before the fruit weight to mature the fastest growing. The duration of fruit development, early-maturing varieties usually 65 to 87 days, mid-maturing varieties of 90 to 133 days, late-maturing varieties of 137 to 168 days. Fruit color is an important indicator of goods. Apple’s good and bad coloring and sugar accumulation of mineral elements of coordination, environmental conditions and hormone types, content, etc. A great deal.
The late control of nitrogenous fertilizers, increased potassium, reduced chlorophyll in the peel, improve air and light conditions, increased degree of sunlight, good drainage, reduce air humidity, spraying NAA and 2.4-D and other hormones, can contribute to Apple color.
Gala Apple from bud emergence to harvest, usually four times Flower and fruit drop. For the first time in the final flowering, stalks together with the flowers fall off and Xie, often referred to as falling. The second time in about a week after falling, ovary slightly increased, sustainable 5 to 20 days, as early fruit drop. Third in the second fruit drop 7 to 14 days after the fruit has reached a large thumb nail, a greater impact on yield, known as the physiological fruit drop, Yunnan generally occurs in May, the phenology of the north later than Yunnan, occurred in 6 month, it said, “June fruit drop.”
In the fourth before harvest, fall fruits mature or near mature, so called preharvest fruit drop. First, the second Flower and fruit drop, nutritional deficiencies and mainly caused by poor pollination and fertilization. The third fruit drop, in addition to competition for nutrients between fruit, the lack of auxin within the embryo, the result is the tip due to intense competition for nutrients. Greater than the osmotic pressure due to leaves of young fruit, the strength of competition for nutrients than the young fruit is strong, so good except when the topping sticks, scissors and so inhibit the growth of new shoots tip, we must also thank the flower timely topdressing fertilizer, add nutrients.