Key Technical Points for Promptly Extracting Flower Panicles After Low Temperatures in Longan
Longan is at the late stage of flower bud differentiation and the early stage of budding. The main tasks are to promote sprouting, promptly extract flower panicles, and prevent "flush shoots." Currently, longan growing normally on Hainan Island has begun budding, while orchards that underwent flower forcing treatment have shown "flush shoots" under the influence of earlier high temperatures, but the recent low temperatures are beneficial to these orchards.
Longan is at the late stage of flower bud differentiation and the early stage of budding. The main tasks are to promote sprouting, promptly extract flower panicles, and prevent "flush shoots." Currently, longan growing normally on Hainan Island has begun budding, while orchards that underwent flower forcing treatment have shown "flush shoots" under the influence of earlier high temperatures, but the recent low temperatures are beneficial to these orchards. In the Guangzhou area, longan has begun sprouting or has not yet sprouted. After this low temperature period, most trees with normal autumn shoot growth should begin to sprout or bud. ① Watering and fertilizing. For mountain orchards or orchards with insufficient soil moisture, if conditions permit, water the entire orchard once. Fertilize after watering, aiming to begin budding in late January or early February. If fertilization trenches were dug during the shoot control stage, fertilize immediately, then water to restore root vitality and promptly extract flower panicles. ② Promote flower bud differentiation. For orchards where autumn shoots matured late or trees are weak, spray 1-2 times with agricultural nucleotides or Qingyise cytokinin to strengthen flower bud differentiation. ③ Thin branches. Branch thinning can be carried out when budding begins. If the canopy is too dense, besides easily causing diseases, it also affects light exposure to flower panicles and affects flower quality. Thin out shaded and weak branches to increase canopy ventilation and light penetration, which is beneficial for fruit growth. ④ If "flush shoots" appear, when the first leaf just unfolds, spray shoot control agent once to stop leaf growth and allow flower panicles to emerge. Only when leaf growth stops can flower buds grow normally.