Longitudinal distribution of maize seeds in the disk plate seed meter operating one or two seed ejection points/Distribuicao longitudinal de sementes de milho com dosador de disco horizontal operando com uma ou duas saidas de sementes

This study had the objective of comparing the effect of using the disk plate seed meter with circular holes operating with one or two seed ejection points in relation to the longitudinal precision of the maize seeds distribution. For the evaluation of this effect, the meter was tested in laboratory with one and two seed exits in ten peripheral disk plate speeds (0.03 to 0.30m [s.sup.-1]). It was employed a complete randomized design with four replications, summing up 80 experimental plots. The peripheral speed quantitative factor was estimated through a 2nd order polynomial regression. The behavior of the seed meter operating with one or two ejection points was similar, with significant difference only in peripherical speeds of 0.06 and 0.09m [s.sup.-1].