What kind of medicine should be used to protect flowers and fruits of mandarin?

During this period, the demand for potassium increased, so high nitrogen and high potassium water soluble fertilizer can be used before and after flowering. To ensure the normal differentiation of flower buds and to protect flowers and fruits, fruit Rubik cube or high potassium fertilizer can be used after fruit to promote the rapid expansion of fruit. At the same time, improve the toughness of the pericarp and avoid fruit cracking.

How to protect flowers and fruits of fertile oranges

1. Topdressing in spring citrus is in the stage of sprouting, flowering, vigorous division of young fruit cells and alternation of new and old leaves, which will consume a lot of stored nutrients, in addition, most of the ground temperature is low and the root absorption capacity is weak. Topdressing available fertilizer and often applying rotten human urine plus urea, potassium dihydrogen phosphate, potassium nitrate and so on to supplement the deficiency of tree nutrition. The study shows that it takes 12 days for quick-acting nitrogen fertilizer soil to transfer to young fruit, while foliar spraying only takes 3 hours. After foliar spraying at flowering stage, the nitrogen content in flowers increased significantly, the dry matter and diameter of young fruits increased significantly, and the fruit setting rate increased. Foliar fertilizer is used to protect flowers and fruits, with a common concentration of 0.3%-0.5% urea, or 0.3% urea plus 0.3% potassium dihydrogen phosphate sprayed at flowering stage, and sprayed again 15-20 days after flowering.

two。 Ring peeling, ring cutting at flowering stage and young fruit stage is an effective method to reduce citrus fruit drop, which can prevent nutrient transport and improve the nutrition level of young fruit. Ring cutting is safer and easier than ring peeling, but the phloem conducting tissue is easy to connect, and one ring cutting often can not achieve the desired effect. The good effect of flower and fruit preservation can be achieved by peeling the trunk or main branch 1 / 2 mm wide, and the girdling can heal for about 1 month. The stronger the tree is, the faster the healing will be. In addition, the removal of spring shoot nutrient branches in spring to save nutrition consumption can also effectively increase the fruit setting rate.