Soil is a very complex system that consists of different proportions of the following four principal components: (1) rock particles, (2) organic matter, (3) the moisture and solutes that make up the soil solution, and (4) air. Although the amounts of rock particles and organic matter are very constant in a given soil, the amount of soil moisture fluctuates over a considerable range, and the amount of air varies approximately inversely with the soil moisture content (Hamilton 1966).
KeywordsClay Photography Percolate
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