What are the methods of citrus fruit preservation in May? What aspects need attention? One article understood!

The period from the first and middle of May to the end of May is the critical period of citrus fruit stabilization. in citrus production, this period is usually called fruit preservation period-fruit stabilization period. At this time, it is a critical period for determining output. What are the methods of protecting citrus fruits in May? What do you need to pay attention to?

What are the methods of protecting citrus fruits in January and May?

The key to fruit preservation is to balance tree nutrition, reasonable leaf-fruit ratio, increase the content of carbohydrates in the tree, increase the ratio of carbon to nitrogen, reduce the contradiction between shoot and fruit, and promote the supply of more organic nutrients to the growth and development of young fruit.

1. Nutritional supplement

As flowering consumes a lot of nutrients, there is a lack of nitrogen, phosphorus, potassium, calcium, magnesium and boron after flowering, especially nitrogen, boron, zinc and so on.

Citrus buds and flowers consume the most nitrogen, so nitrogen fertilizer should be applied properly at flowering stage, such as high nitrogen fertilizer, 1-2 kg / mu. For citrus trees with too many fruits, few branches and general tree potential, it is necessary to apply 2-3 kg of water-soluble organic fertilizer per mu to achieve the purpose of root cultivation. The period from April to June is the expansion period of young citrus fruit, and the nutrient demand is high at this stage, so it is necessary to apply 1-2 taels of potassium fertilizer per plant.

2. Hormone regulation

Fruit trees in florescence and young fruit stage will secrete a lot of auxin and abscisic acid, but if these substances are secreted too much, it will cause excess nutrition and lead to a large number of fruit loss, so timely and reasonable supplement of gibberellin and other hormones can improve the fruit setting rate. However, in order to correctly grasp the time point of using hormone to protect fruit, spraying gibberellin too early in the case of more shoots and less flowers or no thank flowers is easy to enlarge leaves and new shoots, which is not conducive to fruit preservation; late-maturing citrus varieties are mostly seedless and less seedless citrus varieties, which can be used early and sprayed on Xiehua 2swab 3. Multinucleate varieties or grapefruit, use little or no gibberellin.

The use of natural regulators such as algin, brassinolide and compound nitrophenol sodium during the fruit preservation period can enhance the stress resistance of fruit trees, regulate the transfer and transport of plant nutrients from branches and leaves to flowers and fruits, and avoid fruit growth hindered by excessive vegetative growth of branches and leaves.

3. Physical ring cutting

Ring cutting is also an important way to protect fruit, choose strong trees for ring cutting, if the tree is weak or small trees, generally do not need ring cutting, otherwise it will cause tree weakness, affect the autumn shoot, yield decline, serious yellowing, dead trees.

Within 7-15 days after spraying gibberellin and foliar fertilizer, the leaves of spring shoots turn green within 7-15 days, and it is most ideal to sprout a very small amount of new buds, which prematurely affects the green turn and fruit setting of trees, and it is difficult to control the shoots too late.

Seedless varieties are not easy to protect fruit, basically they have to be cut around in order to achieve high yield. The variety with seed depends on the rootstock and tree potential. Horsewater tangerine, mandarin and so on depends on the number of rootstocks and flowers, if it is a strong rootstock such as sour orange head, flowers and trees are recommended to be cut around. In addition, the first hanging fruit trees are often not easy to protect the fruit, in case of abnormal weather, you can consider ring cutting to protect the fruit.

What problems should be paid attention to when protecting fruit?

1. Fertilizer spraying

Every 1000 citrus flowers need to consume 2 grams of pure nitrogen. Citrus blossoms in large numbers and consumes more nutrients. It is difficult to stabilize fruit without fertilizer. About 3 taels of urea can be supplemented per plant in the young fruit stage. If the tree is very weak, it will be replenished in June.

2. Wipe the tip

Citrus bud flowering and spring shoot, young fruit growth and shoot are carried out at the same time, competing with each other for organic nutrients. If you draw too many tips, you will lose flowers and fruits. So young trees with initial fruit, especially those with exuberant growth, should wipe out some strong spring shoots and all June shoots.

May is an important period to determine the yield of citrus trees, as long as meticulous work to protect the best fruit in order to improve fruit yield and quality.