What are the measures for protecting flowers and fruits of citrus?

Fertilization and spraying: trace elements and pesticides for flower and fruit promotion can be sprayed before flowering. Water management: keep the soil moist during fruit preservation and drain well in rainy season. Ring cut fruit preservation: can be used in the early physiological fruit drop with a knife ring cut trunk or large branches 1 circle, need to cut off phloem, but not damage its xylem. Trimming and topping: pruning off overgrown spring shoots and topping them. Shake flowers on rainy days: During flowering, citrus trees can be shaken after rain to enhance light.

I. What are the measures to protect citrus flowers and fruits

1. Fertilization and spraying

Promote the aging of spring shoots, enhance the growth of plants, promote the development of robust flower buds, reduce citrus flower and fruit drop, spray various types of trace elements before flowering, and spray flower and fruit protection chemicals, which is conducive to improving the quality of flower buds.

2. Water management

In order to improve the stress resistance of fruiting mother branches, the soil should be kept moist during waterlogging prevention, drought prevention and fruit preservation, so as to avoid dry and wet imbalance leading to rotten roots and a large number of citrus fruits falling, especially in dry weather, irrigation should be timely, and drainage should be done well when there is too much rain.

3, ring cut fruit preservation

For trees with vigorous growth, in the early stage of the first physiological fruit drop, the trunk or large branch can be circumcised once with a knife. In the early stage of the second physiological fruit drop, it can be circumcised once again according to the tree vigor and fruit bearing amount, which is conducive to improving the fruit setting rate. Circumcision needs to cut off phloem, but its xylem cannot be damaged. It is not suitable for circumcision of old and weak trees.

4. Pruning new shoots and picking

In order to solve the contradiction between shoot pulling and fruit bearing, it is necessary to trim off the overgrown spring shoots first. The shoots can be trimmed off part of the new shoots according to the principle of 3 to 2 and 5 to 3, and then the tops should be picked off in time to save nutrition when the spring shoots grow to 15cm. Finally, when the summer shoots grow to 3- 5 cm, all the shoots should be pruned off and the summer buds removed, which is beneficial to reducing the consumption of nutrition and reducing the fruit drop of the plants. It lasts until the middle of July, and the second physiological fruit drop can be finished.

5. Shake flowers in rainy days and enhance light

Citrus flowering just happens to meet the rainy weather in the south, after flowering will make petals stick together, resulting in poor light, petals easy to yellow and fall off, so can shake the trunk after rain, conducive to enhance light, promote citrus robust growth.

II. How to determine the fruit retention of citrus trees

1, according to the bearing capacity of the tree, to determine the fruit preservation of citrus trees, simply put, strong trees bear more fruit, weak trees bear less fruit, strong trees bear more results because strong trees have lush branches and leaves, so photosynthesis is strong, the production of nutrients is also more, can provide more fruits, provide nutrients needed for growth, conducive to improving the fruit rate.

2. This can improve yield, reduce thick peel fruit, slow down crown expansion, reduce branch crossing and canopy closure. Weak trees bear less fruit because weak trees produce less nutrients, so the nutrients provided can only meet the needs of a small amount of fruit growth and development. If citrus trees bear too many fruits, not only the fruits will become smaller, but also the trees will be weaker, even causing no fruit.

3. The carrying capacity of the tree body is mainly determined according to the tree strength, crown size, leaf color and the number of leaves. Generally, the carrying capacity of the fruit is calculated according to the leaf-fruit ratio. The number of leaves required to carry a fruit is also different for different citrus varieties and species.

4. The suitable ratio of leaf to fruit: mandarin and orange 40-60:1, pomelo 100-200:1, navel orange 30-50:1, super early and early Satsuma mandarin 23-35:1, middle and late mature Satsuma mandarin 20-25:1, small leaf wide peel citrus 50-60:1.