Abstract
A SIMPLE instrument for measuring soil temperatures greater than pre-selected values has been developed for studies of biological processes in the soil1. Mean temperatures can be measured by using a thermistor in a circuit with a voltameter2. The basic form has been extended to measure the integral of temperature × time above the pre-selected value by building the thermistor, the voltameter and a diode into a wheatstone bridge circuit.
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References
Ann. Rep. Agric. Res. Counc. Cent. Africa, 12 (1964).
MacFadyen, A., Oikos, 7, 56 (1956).
Willatt, S. T., Rhodesia, Zambia and Malawi J. Agric. Res., 4, No. 2 (1966).
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WILLATT, S., COKER, D. A Circuit for Integration of Temperature Duration greater than Preset Values. Nature 211, 1325–1326 (1966). https://doi.org/10.1038/2111325a0
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DOI: https://doi.org/10.1038/2111325a0
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