Avaliação horizontal da distribuição de sementes de milho em função de mecanismos dosadores e velocidade operacional

Abstract

The type of operation of the seed drill metering mechanism and the operating speed are determinant in the crop's productivity. The present work aimed to evaluate the longitudinal distribution of corn seeds with different seed metering mechanisms at different displacement speeds. The study at the Experimental Farm of Agricultural Sciences - FAECA of the Federal University of Grande Dourados (UFGD), in the municipality of Dourados, Mato Grosso do Sul (MS). The experimental design used was completely randomized in a 2 x 4 factorial scheme, with 2 seed feeders (pneumatic and mechanical) and 4 sowing displacement speed (5, 7, 8 and 10 km-1). The longitudinal distribution of seeds was evaluated by checking the spacing between seedlings in acceptable, faulty and multiples. Data were subjected to analysis of variation and means compared by Tukey test at 5%. The mechanical metering mechanisms obtained longitudinal distribution values above the minimum up to the speed of 8 km h-1 while the pneumatic speed was 7 km h-1 The pneumatic metering mechanism had better performance for faulty and double spacing compared to the mechanical metering mechanism . The pneumatic dosing mechanism showed a better response in the number of acceptable distribution spacing with increasing speed.