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有些果区的红富士苹果树,只结2至3年的好苹果,就出现了树势早衰。其表现为:新梢短,细弱枝多,叶片小而薄,果个小,着色差,汁少味淡。调查分析认为主要原因:一是土层较薄,肥力不足;二是“三跑”(跑水,跑肥,跑土)严重,特别是跑水,造成干旱缺墒;三是连年刻剥,造伤过多难愈合;四是疏花不严,留花结果过多;五是修剪不当,校多郁闭。对于这类树,在管理上应采取的对策是: 1、加强肥水,养根促枝凡土层薄、肥力差的果园,应结合施肥逐年向外深翻扩盘,不断加厚加宽活土层。结合深翻可剪去死根,促生新根。每年株施有机肥50～100kg、磷肥3～5kg、氮肥1.5～2.0kg,达到以磷促根,以根调水,氮磷配合,增叶促
In some fruit areas, red Fuji apple trees, with only two to three years of good apples, appear premature decay. The performance is as follows: shoots short, thin branches and more leaves small and thin, fruit a small, poor color, less juice less light. Investigation and analysis of the main reasons: First, the soil is thin, lack of fertility; second is “three runs ” (running water, run fertilizer, running earth) serious, especially running water, resulting in lack of moisture drought; Peel, wound healing is too much difficulty; Fourth lax lavage, leaving too many results; Fifth, improper pruning, school and more closed. For such trees, the management should take the following measures: 1, to enhance fertilizer and water, promote root and promote soil where the branches are thin, poor fertility of the orchard, fertilization should be combined with deep-pound expanded late each year, continue to thickened and widened live Soil layer. Combined with deep plowing can cut off dead roots, promote new roots. Each year plant organic fertilizer 50 ~ 100kg, 3 ~ 5kg of phosphate fertilizer, nitrogen fertilizer 1.5 ~ 2.0kg, to promote the root of phosphorus to root water, nitrogen and phosphorus with the increase of leaves to promote