Heliothermic Index developed

Date or time period: 1946

In 1946 Branas[1] developed the Heliothermic Index, a temperature summation adjusted for latitude

SOURCE

  1. ↑ Branas J., Bernon G. and Levadoux, L. (1946) Eléments de viticulture générale. Dehan, Montpellier (France).
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