Harvest time and physiologic quality of seeds in irrigated rice (Oryza sativa cv. BRS Roraima)

Harvest time is one of most important factors influencing rice seed characteristics for purpose of either planting or milling. With the objective to determine a proper harvesting time, irrigated rice seeds of cultivar BRS Roraima were harvested at 15, 22, 29, 36, 43 and 50 days after flowering (DAF)...

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Bibliographic Details
Published in:Pesquisa agropecuária tropical 2008-09, Vol.38 (3), p.188-194
Main Authors: Smiderle, O.J, Dias, C.T. dos S
Format: Article
Language:Portuguese
Subjects:
ARROZ
CALIDAD
CONTENIDO DE HUMEDAD
GRAINE
http://www.fao.org/aos/agrovoc#c_4886
http://www.fao.org/aos/agrovoc#c_5438
http://www.fao.org/aos/agrovoc#c_6400
http://www.fao.org/aos/agrovoc#c_6946
MOISTURE CONTENT
ORYZA SATIVA
QUALIDADE
QUALITE
QUALITY
SEEDS
SEMENTE
SEMILLA
TENEUR EN EAU
UMIDADE
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Summary:Harvest time is one of most important factors influencing rice seed characteristics for purpose of either planting or milling. With the objective to determine a proper harvesting time, irrigated rice seeds of cultivar BRS Roraima were harvested at 15, 22, 29, 36, 43 and 50 days after flowering (DAF), and assessed according to humidity, viability, dry mass of 1,000 seeds, whole grain yield, productivity and storability. Seeds harvested 29 DAF showed high quality and its productivity was equivalent to the subsequent periods. Seeds harvested 50 DAF showed good performance, except for whole grain yield. Harvests 15 and 22 DAF were unsuitable, reducing the physiologic quality of seeds, mill efficiency and high initial humidity. The adequate harvest time for cultivar BRS Roraima is between 29 and 43 DAF, when seeds present higher yield, dry mass, whole grain yield, physiologic quality and storability.Original Abstract: A epoca de colheita e um dos fatores mais importantes que influenciam as caracteristicas da semente de arroz, seja para semeadura ou para consume. Com o objetivo de determinar a epoca adequada de colheita de arroz irrigado, para a cultivar BRS Roraima, sementes foram colhidas aos 15, 22, 29, 36, 43 e 50 dias apos o florescimento (DAF) e avaliadas quanta a umidade, viabilidade, massa seca de 1.000 sementes, rendimento de graos inteiros, produtividade e armazenabilidade. As sementes colhidas aos 29 DAF tiveram alta qualidade e a produtividade foi equivalente a dos periodos subsequentes. Aquelas provenientes da colheita aos 50 DAF exibiram bom desempenho, exceto em rendimento de graos inteiros. Colheitas realizadas aos 15 e 22 DAF sao improprias, reduzindo a qualidade fisiologica das sementes, o rendimento de engenho e a alta umidade inicial. A epoca adequada de colheita para a cultivar BRS Roraima esta entre 29 e 43 DAF, quando suas sementes apresentam maior produtividade, massa seca, rendimento de graos inteiros, qualidade fisiologica e armazenabilidade.
ISSN:1517-6398
1983-4063