For standard fertilization of adult jujube trees that produce approximately 15 kg of fresh dates, apply 1.1 kg of urea, 0.25 kg of pentoxide, and 1.8 kg of potassium sulfate. For young saplings, use 25 grams of pure nitrogen per year, along with 20 grams of phosphorus pentoxide for balanced nutrition. This ensures healthy growth and development throughout the growing season.
Summer pruning is essential for jujube trees that show minimal growth or have poor fruiting during the flowering period. It's important to perform timely summer cuts to encourage better fruit set and improve tree structure. Pruning should be done carefully to avoid over-cutting and to maintain a strong framework for future production.
In terms of pest control, it's crucial to continue monitoring and managing diseases like leaf spot. A recommended mixture includes 90% Wanling diluted 3000 times, combined with 1.8% avermectin diluted between 3000 to 4000 times, or 9.5% chlorfenapyr diluted 4000 to 5000 times. These solutions are effective against pests such as red spider mites and cotton bollworms. Products like Baode can also be used for additional protection.
To prevent jujube rust, increase surveillance and combine treatments with those for leaf spot disease. Starting from July 10th, apply azole-based fungicides such as Wanxing, Fuxing, and Yibao. Apply the treatment every 7 to 10 days, especially within the first three days after rainfall, to effectively prevent the occurrence of rust.
If there are wounds on the tree that do not heal by early July, apply a bark healing agent. The process involves removing the sealant, locating new callus tissue, and applying the liquid directly to the wound. Afterward, cover the area tightly with mud or plastic wrap. Be sure to remove the plastic after one or two days to avoid overheating and potential damage to the tree. This helps promote proper healing and protects the tree from further infection.
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