It is generally believed that the tree growth is too nutritious, the supply and demand of nutrients contradicts, resulting in fruit drop; the tree vigor is weak, malnutrition is caused, resulting in fruit drop; long drought and sudden rainfall cause fruit drop; pest damage, soil compaction, root physiological function weakening, can also cause fruit drop.
Preventive measures: First of all, pay attention to the adjustment of tree vigor through various technical means (summer shearing, topping, spraying of plant growth regulators); second, according to the development of the tree, timely carry out basic management under the tree - top dressing, watering, and ploughing pine Soil, to provide a good root ecological environment for the growth and development of jujube; Third, according to the occurrence of pests and diseases, follow the "prevention-based, comprehensive prevention and control" of the plant protection principle, in advance to spray insecticide fungicides to prevent pests and diseases; Fourth, in the jujube One month before normal maturation, spray 40 mg/kg naphthalene acetic acid (first with a small amount of hot alkali water to dilute the naphthalene acetic acid to the mother liquor, then add water), spray once every 15 days, and spray twice.
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