Correct application methods for topdressing mature jujube trees

Topdressing for mature jujube trees is mainly divided into three periods: (1) Shoot-sprouting period: mostly in April when jujube buds germinate, apply 25 kg of human manure or 1 to 2 kg of diammonium phosphate per tree to promote shoot sprouting, leaf expansion and the formation of flower buds; (2) Early fruiting period: in June, the peak period of flowering and fruit setting, when the demand for nitrogen is relatively large, apply 0.5 to 1 kg of urea per tree; (3) Fruit swelling period: apply 50 kg of barnyard manure and 2 kg of calcium-magnesium phosphate per tree to promote the growth of jujube fruits and strengthen tree vigor.