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大多数园艺发达的国家(匈牙利,德意志民主共和国,波兰,保加利亚,法国,美国,澳大利亚等),在确定果树对营养物质的需要和决定适宜施肥量时,除了根据盆栽和田间试验的资料外,还普遍应用土壤和植物的分析指标。在大多数情况下根据土壤中磷和钾的含量,可以相当准确地确定果树需要相应肥料的数量。而土壤中活性氮含量的指标常常不能反映果树对氮需要的真实情况。所以在大多数国家里主要是用磷钾来判断植物所需要的营养元素的水平。表1列举了在匈牙利条件下果园土壤中活性磷与钾含量的最适水平。当果园土壤
Most developed horticultural countries (Hungary, the German Democratic Republic, Poland, Bulgaria, France, the United States, Australia, etc.), in determining the nutrient needs of fruit trees and determining the appropriate fertilizers, except for pot and field trials, Soil and plant analysis indicators are also commonly used. In most cases, depending on the amount of phosphorus and potassium in the soil, the amount of fertilizers required for the fruit tree can be fairly accurately determined. The indicators of active nitrogen content in soils often can not reflect the true need of nitrogen in fruit trees. Therefore, in most countries, phosphorus and potassium are mainly used to determine the level of nutrients required by plants. Table 1 lists the optimum levels of active P and K in orchard soil under the Hungarian conditions. When the orchard soil