How to keep fruit on longan trees? Do these things well to reduce fruit drop
How to keep fruit on longan trees? What should be noted when keeping fruit on longan trees? We also ask netizens with longan growing experience to help explain. Because longan fruit undergoes physiological fruit drop throughout its entire development process, and the physiological fruit drop of longan trees can reach more than 50% of the total fruit count at its highest, Zhongdi Web has compiled methods for keeping fruit on longan trees, as follows...
How to keep fruit on longan trees? What should be noted when keeping fruit on longan trees? We also ask netizens with longan growing experience to help explainBecause longan fruit undergoes physiological fruit drop throughout its entire development process, and the physiological fruit drop of longan trees can reach more than 50% of the total fruit count at its highest, Zhongdi Web has compiled methods for keeping fruit on longan trees, listed in detail below for netizens' reference.
The periods and causes of longan fruit drop:
The first longan fruit drop occurs 7-14 days after the female flowers fade, when the young fruit begins to "set" and divide into large and small fruits; the main cause of fruit drop is poor pollination and fertilization.
The second longan fruit drop occurs 35-40 days after the female flowers fade, right at the period when the embryo develops rapidly and the old and new nutritive organs within the fruit wax and wane and replace one another; the cause of fruit drop is the imbalance of nutrients and endogenous hormones caused by the disintegration and disappearance of nucellar cells and endosperm;
The third longan fruit drop occurs about 75 days after the female flowers fade; the cause of fruit drop is that this time is right at the stage when the longan flesh develops rapidly and needs to consume a large amount of nutrients. If the tree bears a large fruit load and the tree vigor is relatively weak, fruit drop at this stage will be even more serious.
Methods for keeping fruit on longan trees:
Method one,When the number of female flowers on longan trees is large and the fruit set is heavy, timely thinning of panicles and fruits is one of the conventional measures for keeping longan fruit. If after the first peak period of physiological fruit drop each panicle has fewer than 70 fruits, and after the second peak period of physiological fruit drop each panicle has fewer than 50 fruits, then thinning of panicles and fruits is not necessary.
Method two,After the first physiological fruit drop ends, nutrients should be replenished to the fruit trees in a timely manner. Generally, before the third peak period of physiological fruit drop, soil fertilization can be done 2-3 times, with drenching of decomposed bran water fertilizer being better, and compound fertilizer or phosphorus and potassium fertilizers, etc., can also be applied.
At the same time, throughout the entire longan fruit development process, foliar topdressing should be carried out once every half month; when applying foliar fertilizer, pesticide spraying can be combined with disease and pest control.
Method three,Chemical agents can be used to keep fruit. Compound fruit-keeping agents such as "Guoteling No. 1", "Lizhi Baoguosu" and "Lilong Bao" can effectively supplement the nutrient consumption during longan fruit development and maintain the balance of endogenous hormones, significantly reducing fruit drop during the second and third physiological drops.
Method four,In case of dry weather, the soil needs to be irrigated and the tree canopy sprayed with clean water, especially in the middle and late stages after the flesh emerges when the fruit enlarges fastest, as the demand for water is greater.
Method five,If the longan tree vigor is excessively strong, young and early-bearing fruit trees can undergo girdling or girdling-and-binding to keep fruit, generally carried out right after the female flowers wither, but this should not be used in dry climates or areas with insufficient water sources.
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