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This work objectified to evaluate the efficiency of two meter mechanism of corn seeds when submitted to different forward speed and soil management system during the non-tillage seeding. It was used a factorial design in randomized blocks. The factors whose effects were examined were related to the seeders with pneumatic and horizontal disk meter mechanisms for the distribution of the seeds, to the set tractor-seeder forward speeds (4.4; 8.0 and 9.8 km h-1), and to the soil management system considering the corn no-tillage seeding over minimum tillage with chisel plow and the no-tillage system for the seeding of oat culture (Avena strigosa Schreb). It was verified that the forward speed didn't influence the initial and final stands of plants but it interfered in the regularity of longitudinal distribution of plants. The smallest speed provided the largest percentile of normal spacing between plants. The pneumatic meter mechanism presented better performance than the horizontal disk perforated in the longitudinal distribution of plants. About corn productivity aspect it's indifferent the recommendation of use for pneumatic and perforated horizontal disk meter mechanism of seeds. Este trabalho teve o objetivo de avaliar a eficiência de dois mecanismos dosadores de sementes de milho quando submetidos à variação de velocidade de deslocamento e sistema de cultivo do solo, durante a operação de semeadura direta. O delineamento experimental foi em blocos casualizados, em arranjo fatorial com três fatores: dois mecanismos dosadores de semeadoras-adubadoras de precisão (pneumático e discos horizontais perfurados), três velocidades de deslocamento (4,4; 8,0 e 9,8 km h-1) e dois sistemas de cultivo (semeadura direta de milho sobre aveia-preta em solo preparado com escarificador e no sistema plantio direto). Verificou-se que a velocidade de deslocamento não influenciou nos estandes inicial e final de plantas, mas interferiu na regularidade de distribuição longitudinal de plantas, sendo obtido, na menor velocidade, o maior percentual de espaçamentos normais. O dosador pneumático apresentou melhor desempenho que o disco horizontal perfurado, na distribuição longitudinal de plantas. Sob o aspecto de produtividade da cultura do milho, é indiferente a recomendação de uso dos mecanismos dosadores de sementes pneumático e disco horizontal perfurado

Efficiency of pneumatic and horizontal perforated disk meter mechanism in corn no-tillage seeders in soil with different mobilization reports