Citrus appears to be floating and wrinkled.
In mid-October, the citrus has been changed color, and the golden autumn sand orange and Nanfeng orange have turned yellow and orange. Seeing the citrus harvest is in sight, the later management can not relax, especially to prevent the occurrence of floating fruit.
The citrus floating skin is characterized by cracking of the white skin layer of the peel, and the capsule valve (coating) enveloping the pulp floats after separation from the peel, and a gap is formed between the peel and the capsule valve. The floating skin is often accompanied by the water and granulation of the fruit, which is manifested by the loss of water and granulation of the juice cells, the thickening and hardening of the sac, the reduction of nutrients, the weakening of the flavor and the deterioration of the quality. More serious people with floating skin, food is like a ruin, completely lose the value of food.
Cause of floating fruit
1. The autumn fertilizer is biased with nitrogen fertilizer, which promotes the secondary expansion of the fruit and is prone to floating skin.
2. A large amount of hormones and auxins remain in the soil. Long-term use of hormones containing hormones or hidden components containing hormones, easy to affect the hormone balance and nutrient absorption in the tree, resulting in floating skin.
3. The concentration of gibberellin sprayed during the fruit preservation period is unreasonable, or the amount of foliar fertilizer containing hormones and cytokinins is excessively applied, so that the development of the peel is partially damaged, and the potential defects lead to the formation of wrinkled fruit and floating skin at the mature stage. fruit.
4. Insufficient supply of calcium in the fruit expansion period. When the fruit is swollen to the coloring period, there is a lot of rain, which is easy to cause loss of calcium and boron, and the fruit has insufficient toughness and hardness, and is easy to produce floating skin.
How to prevent floating fruit?
1. Scientific and rational application of fertilizer. Reasonable fertilization and ensuring the normal supply of various elements required for fruit trees are the basis for reducing the production of floating fruit. In general, organic fertilizer is added, and at the same time, potassium, phosphorus, and trace elements are added during the fruit expansion period, and the use or non-use of nitrogen fertilizer is reduced.
2. Strengthen water management. The orchard soil is suitable for wetting, pay attention to drainage during the spring and summer rainy season, and adopt thin water and water pouring method in autumn and winter drought to keep the orchard soil moist, and maintain a balanced supply of water during fruit ripening, but not watering.
3, timely leaf surface calcium supplementation. After the first physiological fruit drop, the young fruit is expanded to the fruit color change period, and in June, July and September-October, the leaf surface is sprayed with water-soluble calcium fertilizer which is easy to absorb in time, and the calcium supplement can be continuously given to the fruit. Reduce the rate of floating fruit.
4. Reasonable use of regulators. Appropriate amount of gibberellin during the fruit-protection period is necessary for fruit preservation, but it should be noted that the concentration should not be too large to avoid floating skin and thick skin.
5, picking at the right time. Late-maturing varieties do a good job of keeping trees fresh-keeping. The picking time of citrus is not as late as possible. Picking at the right time after maturity is beneficial to ensure the quality of the fruit. It is easy to produce floating skin and sugar after long-term retention.
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