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1976—1986年试验结果,明确了稀植成龄苹果树冠光照分布及其与产量、质量的关系,为树形改造提供了理论依据,并认为“双层延迟开心形”是改造苹果稀植树冠的较好树形.提出了大、中型果的合理留果指标,并把一个小枝组作为疏花疏果的单位,使操作者易于掌握.明确亩产2500—3000公斤的丰产园所要达到的施肥水平和土壤肥力水平.为节约劳力、减少伤根和促进根系生长,提出以一面轮替沟施取代生产上普遍采用的环状沟施基肥的方法.还根据树势提出了相应的修剪措施.
From 1976 to 1986, the results of the experiment indicated that the light distribution and its relationship with the yield and quality of the sparsely populated apple tree canopy clearly provided a theoretical basis for the tree shape reconstruction. The author also considered that “double delaying happy heart shape” Of the tree.The proposed large and medium-sized fruit reasonable indicators of fruit retention, and a twig group as a thinning fruit thinning unit, so that the operator easy to grasp.Determine the yield of 2500-3000 kg per mu yield to reach Fertilization level and soil fertility level.In order to save labor, reduce root injury and promote root growth, we put forward a method of replacing ring ditch basal fertilizer commonly used in production on the one hand, and put forward corresponding pruning measures .