The growth of jujube branches and leaves are almost simultaneous with the development of flowers and fruits. The consumption of nutrients is concentrated and concentrated. The reasonable foliar spray fertilizer can quickly supplement certain nutrients.
When spraying fertilizer, jujube leaf surface spraying should be carried out several times, in the physiological fruit drop period of jujube, that is, the final flowering period (about the end of June to the beginning of July) and the rapid growth period of the fruit, that is, the fruit expansion period (about 7~) In August). Spraying time interval of 5 to 7 days, continuous spraying 3 to 5 times, 5 to 10 kg per tree.
The concentration of spray fertilizer is suitable for the fertilizer of jujube leaf surface. The concentration is different, the urea is 0.30%~0.50%, the potassium dihydrogen phosphate is 0.20%~0.30%, the boric acid is 0.20%~0.30%, and the multi-component fertilizer is 0.40. %~0.50%. The mixed fertilizer solution may be 0.30% urea + 0.20% potassium dihydrogen phosphate, 0.30% urea + 0.20% boric acid, 0.20% potassium dihydrogen phosphate + 0.20% boric acid.
Spraying method The jujube tree canopy is tall, high-pressure sprayer should be used when spraying, and high-pressure direct spray gun can be used on the upper part of the canopy to spread the whole tree evenly. The fertilizer and nutrient are mainly absorbed and utilized by the back of the blade, paying attention to the multi-spray back to facilitate absorption and utilization.
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