The peak of citrus physiological fruit drop is coming, and these 4 points must be done well to ensure fruit stability
Starting from April, citrus will usher in the peak period of physiological fruit drop. Due to the time of fruit drop, it will be divided into one physiological fruit drop and secondary physiological fruit drop.
Why do citrus fruit fall?
Organ shedding is a common physiological phenomenon in the plant kingdom. Flowers, organs, leaves and fruits of plants will fall off. During the shedding process, plant cell structure, metabolism and gene expression will change.
Although citrus has many flowers, the natural fruit setting rate is low. After flowering, citrus will undergo one physiological flower drop and two to three physiological fruit drop
In addition to environmental, nutritional and other conditions, the natural fruit setting rate of citrus is generally only 0.5~2. In addition, it is necessary to thin out deformed fruit, weak fruit and diseased fruit in the later stage, so that the yield is too low, so it is necessary to take measures to protect the fruit. Flower protection measures.
Specific measures for citrus fruit preservation
Fertilizer and water management
Thank you for the fertilizer
During the flowering period of citrus, phosphorus and potassium fertilizers can be used to promote fruit setting and mature spring shoots.
In droughts, irrigate reasonably and cover with moisture. Continuous rainy season, pay attention to clear the ditches and drain the water in time.
Foliar fertilizer, regulator for fruit preservation
To prevent a physiological fruit drop: when 2/3 of the flowers are withered, spray gibberellin + cytokinin or gibberellin + brassin + foliar fertilizer (boron, zinc, etc.) to supplement foliar nutrients (organic matter, Phosphorus, Boron, Magnesium, Zinc), regulate hormone levels and reduce physiological fruit drop.
To prevent secondary physiological fruit drop: 15~20 days after blooming, spray alginic acid or amino acid + high potassium foliar fertilizer + natural brassin.
Special for citrus flowers and fruits
Ring cutting and protecting fruit
Circumcision is only carried out on plants that have not produced fruit for many years, and the trees are prosperous and have a small amount of flowers. In other cases, no circumcision is required; and the width and depth of the circumcision are also very particular. , so it should be determined according to the specific situation, not blindly circumscribed.
Shaping and trimming
Trees with too many flowers: a. Thin out some leafless flowering branches, b. truncate the multi-flowering branches, c. prune off the blooming spring shoots at the top, leaving no foundation stakes.
Erase early summer shoots
Pay attention to climate change in a timely manner and take corresponding measures to avoid the phenomenon of falling flowers and fruits caused by bad weather.