Participatory maize breeding for low nitrogen toleranceA. Toledo Machado1 & M. Silvestre Fernandes21: Embrapa Agrobiologia- BR 456-RJ, Km 47, CP 74505, CEP: 23890-000, Seropédica, RJ, Brazil. E-mail: atm@cnpab.embrapa.br 2: Universidade Federal Rural do Rio de Janeiro, UFRRJ – BR 456 – RJ, Km 47, CEP: 23890-000, Seropédica, RJ. Brazil. E-mail: manlio@ufrrj.br The local maize variety Sol da Manhã has a broad genetic background. It was identified in 1985 in a participatory evaluation trial as being suitable for cultivation under low soil fertility conditions in Sol da Manhã, situated in Seropédica, State of Rio de Janeiro, Brazil. The variety was then improved for 6 selection cycles by the formal breeding sector at the experimental station of Embrapa Agrobiologia. There were three cycles of mass selection, one selection cycle between and within half-sib families, one selection cycle within full-sib families, and one selection cycle between and within S1 families. Thereafter, the variety was improved in collaboration with the informal sector, viz. a group of farmers of the agricultural community of Sol da Manhã for 6 cycles of mass selection. The variety was evaluated in 1994 in field trials for grain yield and nitrogen use efficiency. Sol da Manhã can be characterised as efficient in nitrogen use, under both favourable and unfavourable growing conditions.
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