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On the basis of four years' observations changes in temperature of the air and of the soil at depths of 30, 5 and 3 centimetres were studied. The correlations made showed that the average soil temperature is higher than air temperature when the latter reaches very high or very low values. From these measurements the envelope curves of the maximum and minimum temperatures of the soil at 3 cms depth in relation to those of the air were worked out. Some measurements made in the soil of differently exposed slopes show clear differences of temperature and of its excursion.
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