How to prevent empty-shell fruit in longan? Latest measures explained in detail

We are relatively familiar with longan, and it is one of everyone's fairly common fruits. During longan production, empty-shell fruit with a shell but no flesh that cannot expand is easily produced, seriously affecting longan yield and causing incalculable economic losses to fruit farmers. So how can empty-shell fruit in longan be prevented? Follow the editor to take a look at the detailed introduction below.

1. Increase boron fertilizer application

The main reason for the production of empty-shell fruit is that the plant lacks the boron element, which affects pollen treatment, causing pollination and fertilization to be hindered, and ultimately forming empty-shell fruit. Therefore, for this situation, boron fertilizer must be maintained in time during the plant's flowering period. There are two methods for supplementing boron fertilizer. One is to mix in an appropriate amount of borax when applying base fertilizer, generally 1-2 kg per mu, or before flowering, apply 50-100 grams of borax per plant. Another is foliar feeding, that is, spraying foliar fertilizer during the plant's flower bud stage, dissolving borax in water to make a very low-concentration borax solution, and spraying it on leaves or flower buds, which can extremely quickly supplement the plant's boron element.

2. Artificial pollination

Poor pollination and fertilization is also one of the main reasons for longan empty-shell fruit. For this situation, artificial pollination should be carried out. The best time for artificial pollination is 7-10 a.m. First collect the pollen of male flowers, then add 50-100 g of pollen per 50 kg of clean water, add 50-100 g of white sugar, stir thoroughly, and evenly spray it on opened female flowers. Spray continuously for 3-5 days to achieve an excellent pollination effect. When pollinating in low-temperature rainy weather, be careful to shake off the moisture on the branches, then spray the pollen solution to achieve the best pollination effect.

3. Spray hormones

During the young fruit expansion period, due to some reasons, the flesh cannot expand normally, so the empty-shell fruit phenomenon appears. When the young fruit is still the size of a soybean and the fruit stone has just appeared, spray a 920 aqueous solution once, generally adding 1 g of 920 powder per 50 kg of clean water. Spray it evenly on branches, leaves and young fruit. This can stimulate longan flesh development, promote rapid expansion of young fruit, and avoid empty-shell fruit. It can also be used together with foliar fertilizer spraying for better effect.

The above is an introduction to preventive measures for longan empty-shell fruit. I hope it can help you. To learn more related knowledge, please follow us.