Full-crown renewal method and key technical points for old jujube trees

For old trees whose trunks are robust but which no longer have natural renewal capacity, whose crown main branches are incomplete, whose bearing branches per unit are sparse, and whose yields are low, full-crown renewal is advisable during the dormant period. When the main branches are heavily cut back all at once, adventitious buds on senescent trees can sprout in the spring of that same year after the main branches are heavily cut back, and new buds at suitable positions are selected and trained into extension branches of the main branches. To promote the rapid formation of a new crown, fertilizer and water management should be strengthened; in this way, scaffold branches generally form in 2 to 3 years, and heavy fruiting occurs in 4 to 5 years, with per-tree yield greatly exceeding that of the plants before renewal.