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By Jennifer Blizin Gillis

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Organic matter causes a darkening of the soil, and some organic soils are almost black in color. Sandy soils often are light brown. Waterlogged soils develop gray or black colors because of reducing conditions and the presence of ferrous compounds. Pond soils typically have an oxidized surface layer. This layer is brown, but the color of the native soil may also be Physical, Chemical, and Mineralogical Properties of Soils / 41 obvious. Beneath the oxidized surface layer, the typical gray or black color of waterlogged soils occurs.

Deeper layers of pond soil often have 30--40% pore space. When making soil treatments or calculating amounts of certain substances in agricultural soil, one must know the weight of soil that is plowed. ' They recommended a value of I,SOO ton ha- 1 for the weight of the upper IS-cm layer of pond bottom soil. However, their study involved ponds under 10 years old without thick sediment layers. 5. Surface layers have a much lower bulk density than deeper layers, and the bulk density of the surface layer is lower in deeper parts of the pond than in shallower parts.

10). In going from one point to another in the soil, the length of the flow path is unknown. The area of flow is not the cross-sectional area of the flow path, for flow only occurs through the pores. The porosity of soils (11) is defined as Pores fi Solid particles T = axb cross-sectional area, but flow can only occur through pore spaces (white area of cross section). Thus, flow area < cross-sectional area. 10. L = vertical distance through soil, but water molecules cannot take a direct path because of solid particles.

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