AVALIAÇÃO DO DESEMPENHO DE SEMEADORAS EM DIFERENTES VELOCIDADES DE PLANTIO NA CULTURA DA SOJA

Abstract

The present work aims to evaluate the efficiency of two fertilizer sowing machines with pneumatic seed distribution and honeycomb at different planting speeds and their interference on grain yield in soybean crop. The soybean crop was implanted in the city of Jesuítas-PR which has humid subtropical climate and soil classified as Eutroferric Red Latosol. For sowing, a John Deere Model 1113 pneumatic fertilizer sowing machine was used, with 13 sowing lines and 0.45 m spacing between rows with regulation for the distribution of 13 seeds per linear meter and another seeder with mechanical disc type system. Tatu Marchesan model PST4 horizontal honeycomb, equipped with 9 sowing lines with 0.45 m spacing. The treatments were performed in plots 12 meters long and 3.6 meters wide, using only the 7 central lines for data verification. Four planting velocities (4, 6, 8 and 10 km.h-1) were tested, consisting of the treatments, which were distributed in a randomized block design in a 4x2 factorial arrangement. The results were significant between treatments at 5% of significance by the F test for productivity variance analysis, in the regression analysis for the tested speeds were also significant, while for the tukey test for the distribution modalities there were no differences. The highest average production speed between the two sowing machines was 6 km h-1.