Management of litchi in spring is the key.

From September last year to January this year, the weather continued to be warm and dry, dry and dry, which promoted the nutrition accumulation and flower bud differentiation of litchi and longan. The status of litchi trees varied greatly due to different varieties. Corresponding measures should be taken to manage according to the specific conditions: (1) Fertilizer for strong flowers: from the formation of flower ears to 15 days before flowering, old trees and weak trees should be applied early, and each tree should be calculated according to the amount of hanging fruit 50 kg. Application of compound fertilizer 2ml / kg. (2) killing leaflets: before the leaflets begin to develop to turn red, choose leaflet atrophy, leaflet shedding or strong flowers to kill leaflets to cultivate pure spikelets. (3) pruning: trees with gloomy crowns should be pruned, cutting off shady branches, weak branches, disease and insect branches, and improving ventilation and light transmission conditions; trees that have not yet germinated spikes should be pruned as soon as possible, which is beneficial to the germination and growth of flowering ears. (4) panicle control: varieties with long spikes, such as Feizixiao, Guiwei, Nuomici and Huaizhiqing young trees, spray half amount of Qingzaoling to control spike elongation when the spike is 8mur10cm; it is also possible to manually thinning flowers, truncating the spike of 1cm, cutting off half of the spike, or cutting off half of the spike when it is 20cm long; at the same time, removing the side branches of the spike that are too dense or weak, which is conducive to the sturdiness of the spike. (5) strong flower: flower ear weak spray 1 Mel twice polynucleotide + cytokinin + Wanfenglu strong flower, combined with extra-root topdressing and pest control. (6) do a good job of litchi pollination. ① released bees at flowering stage to improve pollination rate. ② florescence should spray water to prevent scorched flowers in case of dry weather. ③ florescence should shake off the flowers on rainy days to prevent retting. (7) Feizixiao, Guiwei and Nuomici, which have good fertilizer and water management and strong trees, should check the ring peeling to keep the ring open if the winter shoot is controlled by spiral ring peeling last autumn and winter; if there is no ring peeling, ring peeling and ring cutting is carried out to protect the fruit before and after flowering. (8) Fruit Debao was sprayed once at 12 and 40 days after flowering, and foliar fertilizer such as polynucleotides could be added to improve fruit quality.