摘要：

The author has investigated whether all instruments for measuring soil temperature give the same results, and the conditions necessary for the measurement of correct and reproducible values.An instrument must fit the shape of the roots properly (horizontal position) and must have a good contact with the soil.This latter condition is always fulfilled in wet soil near the sea and is less fulfilled the more continental the climate is. Large variations in the results using different instruments are found in areas with a continental climate. The author therefore recommends the use of electrical resistance thermometers with lead caps.

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