First, choose easy coloring varieties

The difficulty of coloring apple is mainly determined by the genetic gene of the breed. Therefore, it is more difficult to color the suitable area to select the easily-colored strain. However, it is necessary to prevent over-concentration of easily-colored apple varieties in easily-stained areas, and to promote the synthesis of anthocyanins in pericarp through cultivation measures to increase coloration. The poorly coloured garden leaves or individual plants are recorded separately when they are painted. In the spring, they are replaced by high piles, stripes, and easy-to-stain coloring of the indigo.

Second, the temperature

The minimum temperature for apple growth is about 5°C, the most suitable temperature is 13°C～25°C, and the maximum temperature is about 40°C. The average temperature of fruit coloring period is 13.8°C～18.5°C, and the temperature difference between day and night is 10°C, which is beneficial to the increase of sugar and color. The temperature of 15 to 20 days before harvest has a great influence on the degree of fruit coloration. In short, the large temperature difference between day and night before and after maturation favors coloration.

1. You can grow grass in orchards to improve the orchard's microclimate.

2, from the beginning of September to harvest, if the high temperature and drought without rain, adhere to every day or every other day around 5 pm, spray water on the trees, increase the orchard air humidity, increase the temperature difference between day and night, in order to increase the photosynthesis of the leaves, fruit Sugar accumulates and promotes full coloration of the fruit.

Third, lighting

"Red Fuji" apples are happy and light can promote photosynthetic growth. The accumulation of carbohydrates is beneficial to coloring. When the crown light intensity is equivalent to more than 60% of the natural light, the fruit is well colored and less than 60% is poorly colored.

According to the variety of plants, the distance between the plants is determined and the plant spacing is determined according to the variety of apples.

The spacing and fruit retention method means that the large fruit leaves 2 apples at a distance of 20 to 25 centimeters, and the small fruit leaves 15 apples at an interval of 15 to 20 centimeters. Generally 1 mu yield is controlled at 3000-4000 kg. To the quality of natural control of production; to produce, quality will suffer losses, according to their own sales channels, sales prices may be.

Reasonable pruning, improved ventilation and light transmission conditions on the closed park through the thinning and a large change in shape, eliminate low main branch, overlapping branches, round shoots. From August to September, the thick branch of the closed park was used to pull the branch from 110 to 120 degrees to ease the tree potential and open the light path. Remove the standing branch from the main branch and stand straight on the back of the branch, cut the sorghum squid, and cut the branches within 10 cm of the trunk to eliminate the extraneous branches of the crown and increase the storage nutrients of the tree to promote coloring.

Before picking the leaves to transfer fruits and bags, it is best to choose cloudy or sunny days, and it is not appropriate to remove the bags on rainy days to prevent germs from invading the fruit surface. First cut the shading and fruit-bearing leaves within 15 to 20 cm around the fruit. After 5 to 6 days, remove the light blocking leaves, leaflets, thin leaves, yellow leaves, and old leaves around the fruit, and then remove the autumn shoots. The leaves that affect the light transmission on the leaves and middle upper branches should retain the functional leaves as much as possible so as not to affect the photosynthetic efficiency. When the leaves are removed, the middle, lower and inner canopies of the canopy are removed first, and then the outer periphery of the crown is removed. In short, the number of leaves should not exceed 20% to 30% of the whole tree. The fruit transfer is performed within 5 to 8 days after the bag is removed, and the positive surface color of the fruit is about 70%. Choose cloudy or sunny evenings. Gently rotate the fruit to turn the shady side to the sun side. Do not use too much force to avoid twisting the fruit. Transfer the fruit 2 to 3 times. It is better to use the transparent narrow tape to fix the fruit that cannot be fixed after fruit transfer. Near the branches.

Fourth, moisture

Sustained high temperature and drought, slow coloring, poor coloring. Humidity also hinders the coloring of apples. It is not too dry and not watered. Too much drought can pour water.

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