How to produce full-red Fuji apple

I. Cultivation of moderate tree vigor The content of chlorophyll, soluble solids, and fruit coloration index of the golden mean tree were higher than those of the imaginary tree and the weak tree. When the ratio of the thickness of the stem branches to the result branches was 25%, the fruits were large and colored well; when the ratio of the thickness of the two branches was greater than 30%, the heads of the fruits were large, but the color was poor. Both the backbone branches and the result branches are weak, not only small but also abnormally colored. Therefore, the maintenance of a moderate tree and strong tree vigor is crucial for the production of Red Fuji Red Fruit.

2. Ensure sufficient light in the tree crown Red Fuji apples are sensitive to the light. The fruit on each branch gets full red when it is more than 70% of full sunshine, and when the whole day is 40% to 70%, the fruit surface is partially red, and when the whole day shines below 30%, the fruit surface is not colored. In order to ensure sufficient light conditions for the tree, in the pruning technique, it is necessary to change the winter cut to the summer cut. When winter cuts, the slow-release flattening of the prosperous branches, more sparse not cut, the amount of mu branches maintained between 80,000 to 100,000. Xia Jian must do a good job in April and May to eradicate buds. In May and June, it will be used to remove germs, and in late May to June morning, it will be topping, twisting, and cutting. In the tree shape, the natural semicircle is changed into five main double-layered happy-shape, and the orchard planted with more than 83 plants is suitable for spinning. No matter which kind of tree shape, it is necessary to achieve few main branches, low grades, large angles, and the following hanging-type branch groups are the main ones, so as to ensure that the canopies are airy and light-transmitting, and the fruits are brightly colored.

III. Regulation of leaf mineral nutrient ratio In July, when the nitrogen content of Red Fuji apple tree leaf was greater than 2.5%, the petiole was green and the fruit was difficult to color; when the nitrogen content was less than 1.5%, the petioles and veins were purple-red and the fruit was light. When the leaf nitrogen content is about 2%, the petiole is purple, the leaves are dark green, and the fruit is well colored. From August onwards, it is not advisable to chase nitrogen fertilizer before fruit harvest. At this time, topdressing potassium fertilizer can promote coloration. The higher the soil potassium content, the better the fruit coloring. According to the determination, when the soil potassium content of 0.006% -0.012%, leaf potassium content of 0.5% -0.8% (70% full-day), Red Fuji Apple can reach full red.

Fourth, other technical measures (1) Moderate irrigation. During the early stages of fruit development, a certain amount of fertilizer is maintained, and in the middle period, a certain amount of soil moisture must be maintained. In the later period, water must be controlled. Heavy rain or flooding in later stages is not conducive to increase sugar content and coloration. If the late climate is indeed dry, sprinkler irrigation can be used. (2) In the beginning of summer and the end of autumn, the tree tray covering the grass can protect the roots of the fruit trees, enhance the absorption capacity of the surface roots, and have obvious effects of increasing sugar, increasing color, and improving fruit flavor. (3) Picking leaves, turning fruit, hanging branches. Twenty days before the fruit was harvested, the shade around the fruit and the leaves attached to the fruit surface were removed, and the coloring area was increased by about 15%. After 4-5 days after picking the leaves, gently hold the fruit by hand to turn the dark side toward the sun's surface so that it will see the light in the abdomen and back, which can increase the coloring index by about 20%. The pillars and hanging sticks should be erected in a timely manner in the late fruit growth period so as to prevent the fruits from being stained due to sagging, squeezing, overlapping contact with the ground.

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