The jujube tree typically blooms from May to June in northern regions. During this time, the weather is often dry and windy, which can negatively affect pollination and fruit set. To improve conditions, watering during the flowering period can help create a more favorable microclimate between trees, extend the blooming period, and increase the rate of fruit setting.
When spraying water, it's best to use a high-pressure sprayer early in the morning before 8:00 AM or late in the afternoon after 4:00 PM, on days with little to no wind. Each mature tree should receive 5–6 kg of water per application, while medium-sized trees need 3.5–4.5 kg, and young trees require 2.5–3.5 kg. Spraying should be done once every 1–2 days, for a total of 3–4 times during the flowering season.
To support tree nutrition, you can add about 2% urea solution to the water or mix in 1.25–1.5 kg of well-decomposed human manure per 50 liters of water. To prevent fruit drop, consider adding 50 ppm of calcium chloride or 10 ppm of "920" (gibberellic acid) to the spray mixture. If pests are present, a small amount of dimethoate pesticide can be added during the final spraying session.
Jujube trees require temperatures above 25°C for effective pollination, so avoid spraying when the temperature drops below 20°C. Between 10:00 AM and 3:00 PM is the peak pollination period, and watering during this time may interfere with natural pollination. It’s important to follow these guidelines carefully to ensure the best results for your jujube trees.
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