Citrus flower preservation and fruit protection are essential practices for achieving high-quality and high-yield citrus production. This is especially crucial for oranges that are prone to light frost during winter. However, the use of chemical sprays like "920" and 2,4-D can lead to malformed fruits, which not only affects yield but also contaminates the produce, lowering its market value. To address these issues, several non-polluting methods have been developed to protect flowers and fruits without relying on hormones or plant growth regulators.
First, the application of Guangweisu 802, a broad-spectrum growth regulator, has proven effective in protecting citrus fruits. When sprayed on leaves, it enhances leaf function, increases leaf thickness and chlorophyll content, promotes tree canopy development, and strengthens disease resistance. This leads to improved fruit setting rates and overall fruit quality. It is recommended to spray 802 two to three times during the early flowering and fruit-setting stages, using 10 grams of the product per 20 liters of water.
Second, foliar fertilization is an effective strategy for protecting citrus fruits, particularly during the spring when trees are in bud, flowering, and young fruit cell division. At this time, the tree consumes a lot of stored nutrients, and soil temperatures are often low, limiting root absorption. Spraying fertilizer helps compensate for this. A common method involves applying a 0.3–0.5% urea solution or a mixture of 0.3% urea and 0.3% potassium dihydrogen phosphate during flowering, followed by a second spray 15–20 days later.
Third, rice vinegar offers a natural alternative for fruit protection. Rich in amino acids, glycerin, aldehydes, and minerals, rice vinegar enhances chlorophyll synthesis, boosts photosynthetic efficiency, and increases organic matter accumulation. This improves nutrient absorption, expands leaf area, and promotes fruit enlargement, leading to higher yields and better quality. It should be sprayed every 10–15 days from late May to early July, with a dilution ratio of 300 times. Spraying is best done on cloudy mornings or afternoons, avoiding windy or dewy conditions. Using a fine nozzle ensures even coverage on both sides of the leaves.
Finally, rare earth elements have shown promising results in fruit protection. Studies indicate that spraying rare earth solutions at key stages—such as flower bud emergence, budding, and early fruit development—can increase fruit set by 38.1% and yield by 27.9%. The first application is typically done during bud initiation, and the second is applied after physiological fruit drop. A concentration of 300 mg/kg is generally recommended for optimal results.
These natural and eco-friendly methods provide sustainable alternatives to traditional chemical treatments, ensuring healthier citrus crops while maintaining environmental safety.
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Jiangxi Chengzhi Bioengineering Co., Ltd , https://www.chengzhi-bio.com