That is to say, the fertilizer for accelerating germination is generally applied about 2 weeks before the germination of spring buds, and the available nitrogen fertilizer is often the main one, and then the phosphorus fertilizer and potassium fertilizer are mixed appropriately. Each adult tree can be applied with 300g of urea, 200g of calcium magnesium phosphate and 500g of potassium sulfate or potassium nitrate. This kind of fertilization mainly provides nutrients for the germination, flowering and fruiting of spring shoots. The application amount of spring fertilizer accounts for 15-25% of the total annual amount. The fertilization method can be acupoint application.

Second, pruning

Pruning is an important technical measure to achieve high quality and high yield of citrus. It can make the branches arrange orderly and properly, forming a ventilated and light-transmitting tree structure; It can adjust the balance between vegetative growth and reproductive growth of trees, control the number of flowers and maintain the ability of high and stable yield; Update the branches in time, cultivate the bearing branches, keep the proper ratio of bearing branches to flowering branches, and prolong the high-yield period; Can get rid of the weak and stay strong, renew and age, and maintain a strong tree potential; It can reduce the breeding of pests and diseases, improve fruit quality and yield, and prolong the full fruit period.

Spring pruning is mainly to adjust the proportion of spring shoots, buds and young fruits. When new shoots grow, all the spring shoots at the top of the crown and the excessive spring shoots in the middle and periphery should be removed in time to prevent the spring shoots from blooming too much and reduce the falling flowers and fruits. Re-thinning trees with many flowers into flower mother branches can reduce excessive flowers and young fruits. Citrus trees that have not been pruned in winter should be replanted.

1. Cut off branches and dead branches first, and then cut off some or all long branches, weak branches, cross branches and overlapping branches as appropriate according to the situation of the tree.

2. When the spring shoots germinate, the descending branches are shortened, leaving only 7-8 cm branches at the base, which can be renewed after the spring shoots germinate. Every year, a number of branches should be taken back alternately, so that a number of branches can be rejuvenated and the results can be preserved.