Objetivou-se avaliar a distribuição longitudinal das sementes de milho sob diferentes velocidades na semeadura, utilizando semeadoras de precisão mecânica e pneumática. O experimento foi realizado no ano de 2017, em uma área da Fazenda Chopim, localizada no município de Novo Mundo – MT. O delineamento utilizado foi em faixas com esquema fatorial, composto do fator A (dois tipos de semeadoras – mecânica e pneumática) e do fator B (três velocidades de semeadura - 3,5; 5,5 e 7,5 km h-1). A determinação da distribuição longitudinal das sementes foi avaliada pelos espaçamentos entre sementes germinadas, e posteriormente, foram classificados em aceitáveis, falhos e múltiplos. Os resultados obtidos foram submetidos a análise de variância com aplicação do Teste de F e as médias foram comparadas pelo teste de Tukey a 5% de probabilidade com o auxílio do programa estatístico Sisvar®. A semeadora mecânica na velocidade de 7,5 km h-1 ocasionou menor número de sementes com espaçamento aceitável e o maior número de aceitáveis ocorreu a 3,5 km h-1. Para a semeadora- pneumática o número de sementes aceitáveis se manteve sem diferença estatística nas três velocidades de semeadura (3,5; 5,5 e 7,5 km h-1).Palavras-chave: qualidade, semeadura, plantabilidade, Zea mays. LONGITUDINAL DISTRIBUTION IN THE MAIZE SOWING IN MECHANICAL AND PNEUMATIC PRECISION SEEDING MACHINES ABSTRACT:The objective of this study was to evaluate the longitudinal distribution of corn seeds using mechanical and pneumatic precision seeders under different sowing speeds. The experiment was carried out in the year of 2017, in an area of Fazenda Chopim, located in the municipality of Novo Mundo - MT. The design was used in a factorial scheme, composed of factor A (two types of seeders - mechanical and pneumatic) and factor B (three sowing speeds - 3.5, 5.5 and 7.5 km h-1). The determination of the longitudinal distribution of the seeds was evaluated by the spacings between germinated seeds, later, they were classified as acceptable, faulty and multiple. The results were submitted to analysis of variance with application of the F Test and the means were compared by the Tukey test at 5% probability with the aid of the statistical program Sisvar®. The mechanical seeder-fertilizer at the speed of 7.5 km h-1 causes fewer seeds with acceptable spacing. For the seedermechanical fertilizer the speed of 3.5 km h-1 caused the highest number of acceptable seeds. The pneumatic seeder maintained, without statistical difference, the number of seeds acceptable at the three sowing speeds (3.5, 5.5 and 7.5 km h-1).Keywords: quality, plantabily, yield, Zea mays.
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