Semeadoras-adubadoras em semeadura convencional de soja

The objective of this study was to evaluate the effect of three fertilizer-seeders in ground conventionally prepared and five densities of plants in the row in soybean yield and agronomic characteristics. The sowing was carried through lit years 2001/2002 and 2002/2003, with Monorca and Conquista cultivars, Ferlilizer-seeders were used, being two precision seeders and a one seed drills and manual sowing (witness). The experimental design was randomized blot-As, with three replications, and treatments in split plots. Accuracy ill plant sparing lit the row, grains yield, pods for plant, mass of 100 grains, plants height, lodging and real density of plants in the row had been evaluated. The precision seeder with vacuum metering system provided larger accuracy and grains yield, in relation the mechanical metering system, ill the densities from? 10 to 19 plants m(-1); in the 22 plants m(1) density it did not have difference between the precision seeders with regard to yield; the seed drills, with the conformation used in this work, was not adjusted for the implantation of the soybean crop.