The flowering period of the jujube tree in the north is from May to June. At this time, the time of drought and hot wind is relatively high. If the jujube tree is sprayed in this period, the microclimate between the trees can be changed, the flowering period can be prolonged, and the fruit setting rate can be improved.
Spraying water during flowering period can be selected by high-pressure sprayer before 8 o'clock in the morning or after 4 o'clock in the flowering period and windless weather. The trees sprayed 5-6 kilograms of water per plant, the middle-aged trees sprayed 3.5-4.5 kilograms of water per plant, and the small trees sprayed 2.5-3.5 kilograms of water each time. 1-2 days spray once, spray a total of 3-4 times.
In order to supplement the nutrient of the tree, add about 2% of urea solution in clean water or add 1.25-1.5 kg of decomposed human excrement per 50 kg of water when spraying. In order to prevent the jujube and jujube from falling off, 50 PPM of caustic acid solution or 10 PPM of the "920" solution can be added to the water. If pests occur, appropriate amount of dimethoate pesticides can be added to the spray during the last flowering period. Jujube flowering pollination temperature requirements above 25 °C, so when the temperature is lower than 20 °C should not spray. From 10:00 am to 3:00 pm, it is the period of jujube pollination, and it is not appropriate to spray water at this time.
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