How to prevent empty-shell fruit in longan? These measures you need to master

We are fairly familiar with longan; it is one of the more common fruits. During longan production, empty-shell fruit that has a shell but no flesh and cannot expand is prone to occur, seriously affecting longan yield and causing incalculable economic losses to fruit growers. 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 empty-shell fruit occurs is that the plant lacks the boron element, which affects pollen treatment, causes pollination and fertilization to be hindered, and ultimately forms empty-shell fruit. Therefore, for this situation, boron fertilizer must be applied in a timely manner during the plant's flowering period. There are two ways to supplement boron fertilizer. One is to mix an appropriate amount of borax into the base fertilizer when applying it, generally 1-2 kg per mu, or apply 50-100 g of borax per plant before flowering. Another way is foliar feeding, that is, spraying foliar fertilizer during the plant's flower bud stage. Dissolve borax in water to make a very low-concentration borax solution and spray it on the leaves or flower buds, which can supplement the plant's boron element very quickly.

2. Artificial pollination

Poor pollination and fertilization is also one of the main reasons for empty-shell fruit in longan. For this situation, artificial pollination should be carried out. The best time for artificial pollination is 7-10 a.m. First collect the pollen from male flowers, then add 50-100 g of pollen to every 50 kg of clear water, add 50-100 g of white sugar, stir thoroughly, and spray it evenly on the 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, for some reasons the flesh cannot expand normally, so the empty-shell fruit phenomenon occurs. 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 to every 50 kg of clear water. Spray it evenly on the branches, leaves and young fruit. This can stimulate longan flesh development and promote rapid expansion of the young fruit, so as to avoid empty-shell fruit. It can also be used together with foliar fertilizer spraying for a better effect.

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