What are the methods to prevent longan fruit drop and fruit cracking?
Scientific fertilization based on the growth characteristics of longan and the requirements of its annual growth and fruiting cycle is the foundation for early fruiting, high yield, and good quality in longan trees. Experiments have shown that a longan orchard producing 1 ton of fruit per mu should apply 20-25 kg of pure nitrogen annually (of which nitrogen from organic fertilizer accounts for about 40% of the annual nitrogen application). Nitrogen, phosphorus pentoxide, potassium oxide, calcium oxide,...
Causes of fruit drop: insufficient nutrition. The tree is too weak, or nutrients are consumed excessively, causing fruit to drop from starvation; rainy weather can easily cause root hypoxia; pest and disease outbreaks, etc.Causes of fruit cracking: orchards with poor light penetration have more fruit cracking; excessive fluctuations between dry and wet conditions; old tree age with weak fruiting branches and tips; deficiency of trace elements calcium, magnesium, boron, and zinc makes fruit prone to cracking; excessive application of nitrogen and potassium fertilizers also causes more cracking.
Prevention: Before the rapid fruit flesh expansion stage, during the fruit coloring stage, and before harvest, spray 30 ml each of Yuhualing No. 2 and Yuhualing No. 1 diluted in 15 kg of water, spraying 3-5 times consecutively. After spraying Yuhualing, it can promptly supplement the various nutritional elements necessary for fruit growth and development, enhance disease resistance, reduce fruit drop, and promote fruit expansion and earlier ripening. At the same time, it can promote peel development, making the peel firm and tough with permeability, thereby reducing fruit cracking in the later stages of fruit development.