以往果树的施肥是根据专门的肥料试验进行的,但是土壤的性质(特别是下层土)、果树的营养状态因各个果园而不同。所以,某一地方肥料试验的结果很难原封不动地应用于其他果园。为此,科学的诊断树体的营养状态,即所谓营养诊断的研究发展起来了。 作为重要的肥料成分氮素的营养状态 In the past fruit trees were fertilized according to a special fertilizer test, but the nature of the soil (especially the lower soil) and the nutritional status of the fruit trees differed for each orchard. Therefore, the result of a fertilizer test in one place is difficult to apply to other orchards without any change. To this end, the scientific diagnosis of the nutritional status of the tree, the so-called nutrition diagnosis developed. Nitrogen as an important nutrient component of the nutritional status