Desempenho de dois protótipos de semeadoras-adubadoras para plantio direto

Abstract

With the objective of evaluating the acting of two seeder-fertilizer prototypes for the direct seeding system, works were developed in field conditions and evaluation track according to international standard. The experiments were conduced in the years of 2007 and 2008, evaluating two prototypes, one of precision seeder-fertilizer and another of multiple seeder-fertilizer. When plan a parallel one among the two prototypes, she allow to affirm that the same ones present similar acting in the evaluations accomplished in track. If compared the results obtained for the appraised prototypes in this study, with the one of other seeders of similar characteristics found in the literature, she can conclude that the same ones present acting similar or else better, when of the same variables answer. In the experiments in field conditions with the two prototypes, the studied variables allow to affirm that the same ones present good acting in the direct sowing of soybean (precision seeder-fertilizer prototype) and wheat (multiple seeder-fertilizer prototype). For the studied cultures, larger sowing densities, in the strip from three to five and from eight to twenty seeds m-1, for the corn cultures and soybean respectively, they reduce the percentile of acceptable spacing s among seeds.