Abstract: The fertilizer test conducted during 1985-1988 revealed that the soil characteristics were improved with the application of organic manure in the fertilizer ratio, namely, most enzyme activities and main nutrient contents increased. Our study suggested that the optimum amount of organic fertilizer in the red soil citrus orchards was about half of annual nitrogen fertilizer.

Key words: Red earth, Citrus orchard, Organic-mineral fertilizer ratio, Enzyme activity, Nutrition content

摘要： 1985-1988年的试验结果表明,红壤柑桔园采用有机和无机肥料配施,明显改善果园土壤性状,既可增强多种土壤酶活性,又可使土壤养分含量保持较高水平。红壤柑桔园有机肥的施用量(指氮素)占总施肥量的一半左右是合适的。

关键词: 红壤, 柑桔园, 有机-无机肥配施, 酶活性, 养分含量