Forty soil samples were collected from various parts of South India and were subjected to the determination of important physical properties of soil and various forms of calcium. Exchangeable calcium exhibited high degree of correlation to the clay content. Total calcium and exchangeable calcium showed close correlation with volume expansion on wetting. Moisture constants like water holding capacity and sticky point were correlated with various forms of calcium. Black soils which contained high calcium were found to bo extremely impermeable compared to red soils. Aggregate stability was observed to be markedly high in black soils, which were richer in calcium and clay.
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