Data/hora: 21/06/2024 07:35:59

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 16/04/1997
Data da última atualização: | 05/06/2007
Autoria: | HOPKINSON, J. M.; SOUZA, F. H. D. de; DIULGHEROFF, S.; ORTIZ, A.; SANCHEZ, M.
Título: | Reproductive physiology, seed production and seed quality of Brachiaria.
Ano de publicação: | 1996
Fonte/Imprenta: | In: MILES, J.W.; MAASS, B.L.; VALLE, C.B. do, ed. Brachiaria: biology, agronomy and improvement. Cali: CIAT / Brasilia: EMBRAPA-CNPGC, 1996.
Páginas: | p.124-140.
Série: | (CIAT Publication, 259).
ISBN: | 958-9439-57-8
Idioma: | Inglês
Notas: | CNPGC.
Conteúdo: | Seed of six commercial Brachiaria species is extensively produced for pasture sowing. Production is restricted geographically and seasonally by photoperiodic  flowering reactions. It also requires a prior control of vegetative toller  production, and therefore a reliable dry season. The necessary conditions are, most readily found at high tropical latitudes. Seed crop management is mostly conventinal. Vigorous synchronized tillering is stimulated by decapitation and  use of nitrigenous fertilizer at times when rainfall, temperature, and sunshine are  expected to favor unrestricted development. Ripe seed sheds readily and, coupled with imperfect synchronization of crop ripening, tends to  make conventional direct harvesting inefficient and its timing critical. Where possible, seeds are let to fall and acumulate, and then recovered. Seed yields range from more than 1,000 kg/ha of pure seed to less than 100 kg/ha. Seed quality is heavily influenced by vitality and dormancy. Vitality depends mostly on maturity of seed harvest, being higher in accumulated fallen seed  and much lower in directly severed seed. Dormancy is stringly developed in the genus and persists in most taxa at least into the season after harvest. This created problems for germination testing and in the  field use of fresh seed. Breaching the husk, most commonly by  sulfuric acid, provides of partial solution.Suggestions are offered for improving seed production when developing new cultivars, particulary for compatible with production at low latitude.
Palavras-Chave: | Pasture; Processing; Production; Quality; Seed.
Thesagro: | Brachiaria; Colheita; Dormência; Fisiologia; Pastagem; Processamento; Produção; Qualidade; Semente.
Thesaurus Nal: | dormancy; harvesting; plant physiology; viability.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (3796-1) - UMT - PL - -- - 633.2 - M643b - 1997.00005 - DIS