INFLUENCE OF SOIL PHYSICAL CONDITIONS ON ROOT DEVELOPMENT AND ON PRODUCTIVITY OF CITRUS TREES

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Abstract
The evaluation of the suitability of a heavy soil for citrus planting requires the development of a method for the determination of the soil''s physical properties. In a survey of mature orchards, inwhich air space at field capacity and density of fine roots were determined and yield estimates compared, soil aeration was found to influence root density and tree productivity; a critical limit of 9 to 10% air space at field capacity was found for the 25- to 75-cm layers. Determinations of chemical and mechanical analyses were also made as aid in the evaluation of the soils. In the light of these results the determination of air capacity was introduced on a routine, practical basis fur citrus orchards. In the past few years the usefulness of this method has been proven in many instances.

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