3 CYCLES OF SELECTION AMONG AND WITHIN HA LF-SIB FAMILIES ON MAIZE POPULATION BR-5028 - SAN-FRANCISCO IN THE BRAZILIAN NORTHEAST

Between 1985 and 1988, at Gararu, Propria and Poco Verde in Sergipe, B razil, three cycles of selection among and within half-sib families we re realized on the maize population CMS 28, aiming to obtain a better yielding and more adaptative material to this region. The families wer e evaluated using two simple lattices 10x10 obtaining one cycle select ion year. The estimates of additive genetic variance obtained in origi nal and I cycles varied from 405,00 to 625,10 (g/pl)(2), while in cycl e II were lower due water stress. The estimated mean gain for weight k ernel with the three cycles of selection was 10,60%. The magnitude of the estimates and the high values for narrow sense heritability and ge netic variation coefficients expressed the variability of this populat ion to continue a breeding program.