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柑桔的抗寒力,除了与种类品种和栽培环境有直接影响外,与树体贮藏营养水平及内源激素密切相关。加强秋冬期管理,喷施叶面肥,补充营养,喷洒生长延缓剂,增强营养代射,抑制营养生长,促进碳水化合物积累,提高细胞浓度,能有效地减轻低温冻害。秋梢生长期喷洒300-400PPM多效唑或防冻液(0.25%矮壮素+1.5%氯化钙+0.1%-0.2%锰、铜等微量元素混合液)1-2次,增强叶绿素合成,促进秋梢自剪早熟,控制晚秋稍发生,促进可溶性精与粗淀粉积累,降低细胞含水量,减少自由水,增加束缚水,提高抗寒力。采果前后,结合施用恢复树势肥,利用尿素、磷酸二氢钾叶面喷施,把叶片中的氮、钾含量分别调整到2.5%-2.7%和1.5%-1.7%的最大耐寒指标范围。采果前与采
Cold hardiness of citrus, except with the type of species and the cultivation environment has a direct impact, and the tree is closely related to the level of storage of nutrients and endogenous hormones. Strengthen autumn and winter management, spraying foliar fertilizer, nutritional supplements, spraying growth retardants, enhance nutrient substitution, inhibit vegetative growth, promote carbohydrate accumulation, increase cell concentration, can effectively reduce the low temperature frost damage. Autumn shoot growth period spraying 300-400PPM paclobutrazol or antifreeze (0.25% CCC + 1.5% calcium chloride + 0.1% -0.2% manganese, copper and other trace elements mixture) 1-2 times, enhance chlorophyll synthesis and promote autumn Early pruning shoots, controlling the late autumn occurred slightly, and promote the accumulation of soluble starch and crude, reduce cell moisture, reduce free water, increase irreducible water, improve cold hardiness. Before and after harvesting, the combined application of foliar fertilization, the use of urea, potassium dihydrogen phosphate foliar spray, the leaves of nitrogen and potassium were adjusted to 2.5% -2.7% and 1.5% -1.7% of the maximum cold tolerance range . Picking fruit and mining