加州柑桔生产者为了找出一个施肥的可用指标,根据肥料试验和土壤分析中推导出施肥的比例,已获得一定的成功。但由于土壤,栽培和灌溉技术,气候情况的变化很大,以及所用砧木繁多,施肥比例试验在加州柑桔园的用处是有限的,特别是氮肥。土壤氮素的分析结果未获得成功,而对其它元素的分析,预告树的反应方面仅部分成功。现在生产者已转向叶片分析,用叶片分析来指导养分的有效性,接受已久,并对其 California citrus producers have had some success in finding a useful indicator of fertilization based on the proportion of fertilizers derived from fertilizer tests and soil analyzes. However, due to the wide variation in climatic conditions, soil and cultivation and irrigation techniques, and the large number of stockpiles used, the use of the fertility proportion test in California citrus orchards is limited, especially for nitrogen fertilizers. Analysis of soil nitrogen was unsuccessful, while analysis of other elements predicted that tree response was only partially successful. Now producers have turned to leaf analysis, using leaf analysis to guide the effectiveness of nutrients, have been accepted for a long time, and their