Abstract
The objective of this work was to evaluate the interaction between genotypes and environments for productivity and content of protein and oil, as well as to estimate the genetic parameters and genetic variation among 18 genotypes of soybean grown in four environments. The experiments were set up in the 2006/2007 agricultural year in a randomized block design with three repetitions. The content of protein and oil in the beans was determined by near infrared spectroscopy (NIR). In the four environments the significance was noted for genetic variability and genotype x environment interactions for all traits. Estimates of the heritability of the analyzed variables were high, indicating potential for selecting superior genotypes in breeding programs. In partial correlation analysis only the oil and protein contents were significantly correlated. Correspondence was observed between the UPGMA and Tocher estimation methods, dividing the genotypes into three heterotic groups, with the protein content being the character that most contributed to genetic diversity. Key words:
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