The jujube tree has more flowering, less fruit setting, easy to crack fruit, light fruit flavor, poor coloring, and easy to be infected with jujube disease. It is closely related to the lack of trace elements in the plant such as calcium, magnesium, boron, zinc, iron, molybdenum, and manganese. In winter, medium and trace element fertilizers should be applied in time to increase the level of trace elements in plants. After the jujube tree has completely fallen in winter, the garden should be cleared in time to remove the dead leaves and all the weeds in the orchard, and bury and burn it outside the garden. Then fertilizing, mainly high-quality organic fertilizer, biological bacterial fertilizer, nitrogen, phosphorus and potassium complete fertilizer, supplement phosphorus and potassium fertilizer, and increase the application of trace element fertilizer. Trees over 3 years old, 15-20 kg of manure, livestock, and poultry manure per plant, 2 to 3 kg of compound biological bacterial fertilizer, 0.75 to 1 kg of potassium sulphate compound fertilizer. Calcium phosphate or calcium-magnesium phosphate fertilizer 1 ～ 1.5 kg, potassium sulfate 0.5 ～ 0.75 kg, Xingpeng Calixol or Han and Oushen medium and trace element fertilizers 0.35 ～ 0.45 kg. After all the fertilizers are fully stirred and mixed, drip in the crown Dig a ring-shaped shallow trench with a depth of 25 to 30 cm each and spread it evenly in the ring-shaped shallow trench. Cover the soil with fertilizer, and then apply 60-80 kg of clear water or biogas slurry or hoe to each tree. Make rotten cooked human, livestock, and poultry manure, and evenly spray it on the soil that covers the annular shallow trench. It is advisable that the water completely penetrates into the soil and does not flow out, in order to promote the dissolution and transformation of fertilizers, supply the root system for absorption and utilization, and improve the winter fertilization of jujube effect.
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