Variabilidade de plantas de soja originadas de sementes de diferentes níveis de qualidade fisiológica

Abstract

The objective of this work was to evaluate the variability among plants within populations of soybean, established with different levels of vigor. Seed lots of soybean cultivar CD 202 with three levels of vigor (high, medium and low) were used. The plots consisted of 1 line of 7 m long spaced 0.45 m from other plots. The experimental design was a randomized block design with four replications. A total number of 50 seeds were arranged within the planting rows to obtain and adequate number of plants and the excess of plants were later thinned. The initial population after thinning was 32 plants m -2. All plants in the 6m linear from each plot were collected and the following determinations were performed: plant height, stem diameter, number of stems per plant and number of pods per plant. The plants were harvested individually and all above mentioned parameters were also evaluated. In addition, the coefficient of variation was calculated and used as an indicator of variation between plants in plant populations. It is concluded that low quality seeds cause a decrease in the survival of plants in the field and increase in the variability among plants in plant communities.