Avaliação do desempenho de uma semeadora-adubadora de plantio direto na cultura da soja.

Abstract

The sowing process is one of the most important operation involved in the system of grain’s production, and the execution with quality a primordial factor for the success of the production. Like this, this work has as objective studies some indicative parameters of the acting of the group tractor/seeders in direct planting, using different planting depths and progress speeds, during the process of soy’s sowing in a loamy soil. The treatments were mounted in subdivided portions where the portions constituted the planting depths and the splitplot the progress speeds with four repetitions. The indicative parameters of acting were, skating of the tractor and of the fertilizer-seeder. After the planting, it was evaluated the longitudinal distribution of seeds and the index of emergency speed. In agreement with the obtained results, it can be ended that: The depths and the progress speeds didn't interfere in the index of emergency speed, in the skating of the tractor, in the skating of the fertilizer-seeder and in the acceptable spacing. The speed of 7,70 km h-1 presented larger percentile of flaws. In a general way, the appraised seeders presented regular acting as for the uniformity of distribution of seeds.