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Influence of Drainage upon Coastal-Plain Soils

Bureau of Chemistry and Soils

ABSTRACT

Data are presented for a series of soils developed from the same parent material, and under the same climatic conditions but with variable drainage. The soils are all acid, ranging in pH from 5.1 in the best-drained to 4.1 in the poorest-drained soils. The amount of eluviation increases with drainage, but the degree of leaching and debasing increases with the lack of drainage.

The bases are low in the colloids of all the soils but are lowest in the poorly-drained soils. The extent of variation in the major constituents of the soil colloids is indicated by the silica-sesquioxide ratio, which varies from 1.2 in the well-drained to 2.2 in the poorly-drained soils. Other derived data, such as the ratios of silica to alumina, water to alumina, silica to total bases, and combined water, each aid in interpretation of the chemistry of the colloid.