Cherry is the first fruit in spring. At the end of March and the beginning of April, cherry has entered the stage of fruit swelling and discoloration. Some cherries planted in greenhouses have been on the market. How to promote fruit coloring is a concern of cherry growers. During the development of fruit, a series of changes have taken place in peel pigment. As the fruit ripens, chlorophyll a is first converted into chlorophyll b, and carotenoids and anthocyanins gradually increase. Especially the coloring degree of fruit is an important index to measure the quality of fruit.

Generally speaking, if the pruning and shaping of cherry trees are better, there is no need to pull branches. For example, if we use a tree with high light efficiency, the main branches are open and the light is sufficient, so there is no need to pull the branches. However, if the pruning is not in place and the crown is seriously covered, it is necessary to open the angle of the branches to provide sufficient lighting conditions for the fruits in the crown. Spraying amino acid compound micro-fertilizer or rare earth micro-fertilizer on leaves after flowering and before defoliation can significantly improve leaf quality, increase photosynthetic efficiency, promote fruit color development and increase single fruit weight. At the same time, adding calcium fertilizer can effectively reduce fruit cracking and improve the sweetness of cherry taste.

On the basis of reasonable pruning and improving the ventilation and light transmission of the crown, leaf picking is carried out. In the fruit coloring stage, leaves that seriously hinder fruit illumination can be removed. Leaves on causal branches play an important role in flower bud differentiation, so it is necessary to avoid excessive leaf picking to avoid affecting flower bud differentiation and development. The fruit on the short fruit branch is blocked by the clustered leaves and cannot be colored normally. Therefore, when the fruit is colored, the shading leaves can be slightly turned to the back of the fruit to increase the amount of visible light and promote the fruit coloring. Silver reflective film can be laid under the crown from 10 to 15 days before fruit harvesting, which can increase the light intensity of fruits in the lower part of the crown and the inner room and promote fruit coloring. Frequently remove dust and sundries from plastic film, increase the transparency of plastic film and promote fruit coloring.

In addition, some people use some growth regulators to improve coloring, but if the above measures are done well, there is no need to use regulators. However, no matter what measures are taken, the measures to improve fruit coloring need to achieve the maximum effect on the basis of fully balancing nutrient supply.