First, cultivate autumn buds of golden section.

If you want to make thin sand, you should start from autumn shoots and cultivate moderately weak autumn shoots. The fruit in the coming year is moderate in size and not easy to be rough. For example, if the autumn shoots are too strong, the fruits will be big, thick and floating at maturity. Cultivating the autumn shoots of the golden mean is mainly to control the strength of branches through fertilization, combined with thinning the shoots to maintain the weak branches of the golden mean. If the fruit tree bears fruit for the first time in the second year, if the autumn shoots are too strong, it can twist/pull the branches and weaken the tree.

Second, the correct use of gibberellin

Without gibberellin, it is difficult to keep the fruit of sugar orange. Proper use can improve the fruit preservation rate, and improper use (too many times and too high concentration) will cause the peel to thicken.

Third, correct fertilization.

Excessive nitrogen fertilizer will lead to excessive tree vigor, and the peel will be thicker when the tree vigor is strong, so it is necessary to control the amount of nitrogen applied to the tree vigor. Before and during the growth period of autumn shoots, the amount of nitrogen fertilizer will be properly controlled so that autumn shoots will not be too prosperous. Fertilizers and potassium fertilizers with high organic matter are applied during fruit expansion, and phosphorus and potassium fertilizers are supplemented during color change. Phosphorus plays the role of color and ripening, potassium plays the role of deacidification, sweetening and coloring, and the peel thickness is moderate. When sugar accumulates to a certain extent, it will naturally sand up.

Fourth, reasonable pruning.

Pruning can improve the ventilation and light transmission of trees. Good ventilation and light transmission are conducive to fruit expansion, coloring and sweetening. When sugar accumulates to a certain extent, it will naturally sand up. Pruning is mainly divided into two stages, autumn pruning and winter pruning, that is, before putting autumn shoots and after picking, pruning branches with serious diseases and insect pests, pruning branches that are too dense, and pruning branches that stand upright in the middle of the crown.

Extended data

Reasons why sugar oranges can't produce sand:

The main reason why sugar oranges can't be sanded is that the skin is thick. If the skin is thick, there is no chance to sand. The main reasons for thick skin are improper use of gibberellin in fruit protection, improper use of shoot-killing drugs, phytotoxicity when young fruits occur, excessive growth of trees and excessive application of nitrogen fertilizer.

Even if the fruit protection medicine is used correctly for the first time, many orchards still have the problem of thick peel. This is because the fruit didn't hang last year, the tree was rich in nutrition in autumn, and the branches were too full of nutrition, so the peel was easy to be thick but not sandy.