Bioclimatic characteristics of wheats in southern Brazil

Abstract

Wheat trials were conducted at Pelotas, Rio Grande do Sul, from 1960 to 1967 to evaluate the bioclimatic characteristics of several commercial varieties and lines bred for use in southern Brazil. Using the heliotermic index of Geslin for interpretation, the authors conclude that the wheat varieties being grown in the region fall into four bioclimatic types: super-early, early, intermediate and late. Each type has different requirements in regard to temperature and day-length. To meet climatic adversities in the main wheat region, super-early and intermediate types are considered to have the most promise.