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Summary. Continuous measurements of soil temperatures were made at 1·3, 2·5, 5·1, 10·2, 15·2 and 20·3 cm below the barren surface of a Drummer silty clay loam during 1969. Annual average temperature at all these soil levels was higher than the air temperature 122 cm above the soil surface. The daily fluctuations in soil temperatures were greater in summer than in winter and were greater down to depths of 5·1 cm than the fluctuations in air temperature. The maximum and minimum temperatures for the year, of the air, 1·3‐cm and 20·3‐cm depths were 34 and ‐ 19,46 and ‐ 18, and 33 and ‐ 8°C, respectively. On near cloudless days, the soil temperatures showed a pattern of amplitude reduction and phase retardation with depth, as the soil layers warmed and cooled. Variations de la température dans les couches super ficielles d'un sol agricole
Stoller et al. (Sat,) studied this question.