Avaliação agronômica de progênies de policruzamento de trevo-branco em dois locais do Rio Grande do Sul

The aim of this work was to select higher yielding and persistent genotypes, evaluating their progenies agronomically. The DM yield of 22 progenies compared with the population of UFRGS-2004-2 and with the Jacui cultivar of white clover mixed with ryegrass (Lolium multiflorum Lam.), during the years 2008 and 2009 was evaluated. The average DM yield of white clover during the two years was 3671 and 2107 kg/ha, in Eldorado do Sul and Bage, respectively. In Eldorado do Sul and Bage the Jacui cultivar with thirteen more progenies formed groups with higher production. Seven progenies were in the group "a" in both places, whereas only the population of UFRGS and one progeny had lower production in both sites, with genotype × environment interaction. Progenies 2, 6 and 7 from Bage and 22 (Ethiopia), 23 (Portugal), 24 (United States) and 30 (Ireland), can be utilized in the creation of a more productive and synthetic cultivar, in addition to being more resistant to summer conditions.