Measures for thinning flowers and fruits of citrus

Although there are many kinds of citrus, most of them have the characteristics of multi-flower and multi-fruit. Citrus often blossoms in the flowering stage, but it often blossoms throughout the flowering period, and only 1/3 of the flowers bear fruit in the end. The number of citrus fruits is also more than that of other fruit trees, but the number of fruit will be reduced in the end, if no one chooses flowers, fruits and fruits. If it is left to natural selection, it may lose more.

First, the purpose of thinning flowers and fruits

Citrus blossoms a lot, but not all of them turn into fruit. 90% of the flowers will fall with the physiology, which will consume a lot of tree nutrients and weaken the tree potential. Therefore, it is necessary to remove most of the flowers and set aside the best parts and the best quality flowers to bear fruit. After fruiting, you only need to retain the fruit on the obviously safe fruit-bearing branches, and the weak branches should leave less fruit, in order to concentrate nutrition and maximize play in the useful parts.

Second, thinning flowers and fruits

1. Artificial flower thinning

Flower thinning can be carried out throughout the flowering period, but mainly the earlier the better, the earlier the less, and on the contrary, the more. Generally from the weak branches, deciduous branches, basal branches on the fruit branches, with flowers with branches sparse away. Late autumn shoots or some flowers that cannot turn green may be abnormal and need to be truncated. Some of the flowers may be effective, or they can be completely removed. There are multiple buds between the axils of the same flowering and fruiting branch. you only need to keep two good buds and remove the excess. In addition to these, all the weak flowers, incomplete flowers, flowers damaged by diseases and insect pests, underdeveloped flowers, overdense branches, only growing branches, were removed.

two。 Artificial fruit thinning

At the beginning of the fruit, you can shake the tree first. if you shake it gently, the fruit that falls will be restless. Then the diseased branches and fruits should be removed. In addition, there are 6 to 8 fruits on the robust fruiting branches, 5 to 6 fruits on the weaker fruiting branches, and the rest are thinned. It is too dense in the same space to remove some of the fruit.

3. Chemical flower thinning

In the areas and varieties with early flowering, naphthylacetic acid can be used to spray and sparse flowers about 20 days after flowering, but the varieties with late flowering can start spraying one month after flowering, which is relatively delayed. The weak flowers fall off automatically after spraying.

4. Chemical fruit thinning

Manual labor consumes a lot of manpower and the cost is high, so growth regulators can be used to sparse flowers and fruits. In general, ethylene will accelerate the delamination and have the effect of fruit removal, so you can spray indole ester to increase the ethylene content of the tree to thinning the fruit. Ethephon can also be used to produce more ethylene than indole esters, but for a shorter time.

The reason why thinning flowers is to better protect flowers, and then focus on high-quality flowers to bear fruit, reduce consumption, that thinning fruit is also to concentrate nutrition on high-quality fruit, protect fruit, and improve yield and fruit quality. Therefore, it is necessary to treat sparse flowers and fruits correctly, do not be a pity, and avoid the results of large and small years.