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O Centro-Oeste brasileiro representa a regiao brasileira com maior area e producao de sementes de Megathyrsus maximus, uma graminea muito utilizada para a formacao de pastagens em regioes tropicais do Brasil e outros paises da America. Objetivou-se no presente estudo diagnosticar a qualidade fisica e fisiologica de sementes de tres cultivares da especie M. maximus (Mombaca, BRS Tamani e BRS Zuri) comercializadas por diferentes empresas de Campo Grande (MS). Os experimentos foram conduzidos utilizando-se sementes da safra 2017-2018 em um delineamento inteiramente casualizado, em esquema fatorial 3 x 6, avaliando-se tres cultivares e seis procedencias. As variaveis analisadas foram: pureza fisica, peso de mil sementes, primeira contagem do teste de germinacao, germinacao, valor cultural e teste de tetrazolio. Os resultados encontrados demonstram que, com excecao de um lote da cultivar Mombaca, os demais lotes das tres cultivares da especie Megathyrsus maximus (Mombaca, BRS Tamani e BRS Zuri), de todas as procedencias avaliadas, apresentaram qualidade fisica e fisiologica compativel com a comercializacao em funcao da legislacao vigente. No entanto, e possivel encontrar lotes com qualidade distinta no mercado de Campo Grande. Assim, a escolha adequada da procedencia (empresa) vai garantir a expressao maxima do potencial genetico, subsidiada por processos adequados de producao e pos-colheita. Palavras-chave: Megathyrsus Mombaca. Gramineas Tropicais. Teste de Germinacao. Teste de Tetrazolio. Valor Cultural.   Abstract Brazilian's Midwest represents the region with the largest area and production of Megathyrsus maximus seeds, a grass widely used for the pastures formation in tropical regions of Brazil and other countries in America.The objective of this study was to diagnose the physical and physiological quality of seeds of three cultivars of the species Megathyrsus maximus (Mombaca, BRS Tamani and BRS Zuri) commercialized by different companies of Campo Grande (MS). The experiments were conducted using seeds of the 2017-2018 harvest, in a completely randomized design, using a factorial scheme 3 x 6, with three species and six sources, totaling 18 treatments. The variables analyzed were: physical purity, weight of one thousand seeds, first count of germination test, germination, cultural value and tetrazolium. The results showed that with the exception of one lot of cultivar Mombaca, the other lots of the three cultivars of species Megathyrsus maximus (Mombasa, BRS Tamani and BRS Zuri), of all provenances, have compatible physical and physiological quality with marketing in accordance with current legislation. However, it is possible to find lots of different quality in the Campo Grande market. Thus, the appropriate choice of source (company) will guarantee the maximum expression of genetic potential, subsidized by adequate production and post-harvest processes. Keywords: Megathyrsus mombaca. Tropical Grasses. Germination Test. Tetrazolium Test. Cultural Value.

Qualidade Física e Fisiológica de Sementes Comercializadas de Capim-Colonião em Campo Grande - MS