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Moisture Relations of Soil Inclusions of a Texture Different from the Surrounding Soil¹

ABSTRACT

The rates of wetting and drying of soil inclusions, showed that the rate of rise of soil suction in the inclusion when compared to the surrounding soil was greatest with Ducor clay. The other soils followed in order of decreasing clay content. The rate of wetting was also greatest in the Ducor clay inclusion; the others were in the following order Coachella loamy sand > Ramona loam > Chino loam. The inclusions consisted of the soil ball on commercial nursery-grown citrus trees. The ball was wrapped in burlap in the usual manner. The Chino loam inclusions took 3 times as long to wet as the surrounding soil when they were placed in either the clay or sand. The data indicated that extra caution must be used in orchard operation when the texture of the nursery soil is different from the field soil.

¹ Paper No. 1534, University of California Citrus Research Center and Agr. Exp. Sta. Riverside. Presented before Div. S-6, Soil Sci. Soc. Am., Nov. 17–21, 1963, at Denver, Colo.

² Assistant Horticulturist, formerly Assistant Horticulturist, and Laboratory Technician II, respectively, University of California Citrus Research Center and Agr. Exp. Sta. Riverside.

Received for publication February 24, 1964. Accepted for publication April 13, 1964.