What about the second physiological fruit drop of citrus?

In the process of citrus growth, there are generally two physiological fruit drops every year, which is also the main reason for the reduction of normal citrus production. The second physiological fruit drop is from May to June, which is also the summer shoot shooting period and the young fruit expansion period, when the nutrients are grabbed between the fruit and the shoot, resulting in poor fruit growth and normal fruit drop. So what should we do about the second physiological fruit drop of citrus? Let's take a look at the detailed introduction.

1. Control the new tip

During the period of summer shoot emergence, in order to avoid summer shoot germination and fruit expansion to seize nutrients, so to restrain the growth of summer shoot, the method of ring cutting and controlling shoot can be adopted for fruit trees with strong tree potential, but it is not suitable for fruit trees with weak tree strength. Large-scale watering orchards can take the method of manual removal of summer shoots, while in larger orchards, manual removal is time-consuming and labor-consuming, so it is recommended to adopt chemical shoot control, and spraying before summer shoot germination can reduce the amount of summer shoot germination.

2. Strengthen nutrition management.

In the period of young fruit expansion, young fruit and summer shoot need a lot of nutrients to grow, and the main reason for the second physiological fruit drop is caused by uneven nutrition. Therefore, in order to prevent the second physiological fruit drop, the best way is to apply fertilizer to supplement nutrition for the plant. Fertilization should be reasonable according to factors such as tree strength, soil, climate and tree age. the principle of fertilization is less nitrogen fertilizer and more phosphorus and potassium fertilizer. This is to avoid excessive growth of summer shoots, so as not to aggravate fruit drop, and excessive nitrogen fertilizer will absorb the absorption of other nutrients by the root system, while the application of more phosphorus and potassium fertilizer can speed up nutrition transport, accelerate fruit expansion and reduce fruit drop.

3. Pest control

In addition to fruit drop caused by nutrition, diseases and insect pests are also one of the causes of fruit drop. From May to June, citrus scale insects, whiteflies and red spiders are concentrated. It will harm the leaves and fruits, reduce the synthetic nutrients of the leaves, make the fruits do not have sufficient nutritional growth, and aggravate the phenomenon of fruit drop. Therefore, we must pay attention to the prevention and control of diseases and insect pests, giving priority to prevention, comprehensive control, spraying pesticides in the flowering and fruit stage, strangling the diseases and insect pests in the cradle.

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