Comparing pollination control bag types for sorghum seed harvest.

Efficacy of pollination bags made of new nonwoven fabrics was compared with the traditional paper bags in sorghum during 2015 using three cultivars comprising BR007B (red seeded), SC283 (white seeded) and 1167048 hybrid with tannin (brown seeded). The five pollination bag treatments were: no bagging, traditional paper bag, paper bag plus plastic screen bag for extra bird protection, duraweb®SG2 polypropylene bag and duraweb®SG1 polyester bag. There was no bird damage on tannin hybrid but birds damaged bags to access grains of the other two varieties. Varieties and bag types differed significantly, and also showed significant interactions for panicle weight (at P<0.06), seed weight and average seed weight per panicle. The tannin hybrid was consistently a better performer for all traits regardless of bag type. The paper bags were the worst for bird damage. Duraweb® SG1 was the best performer for all traits including bird damage followed by duraweb®SG2. The joint regression analysis showed that BR007B performed consistently under all bag types with average response. On the other hand, SC283 improved its response with the increasing quality of bag type at an above average rate for panicle weight and seed traits. It was concluded that new nonwoven fabric bags could replace paper bags in providing better seed production potential and greater protection against bird damage.

Qualidade de sementes de girassol na safrinha do Distrito Federal.

RESUMO: O presente trabalho teve como objetivo avaliar, através de diferentes testes, a qualidade fisiológica de sementes de girassol na safrinha do Distrito Federal. Os testes foram realizados no Laboratório de Sementes da Faculdade de Agronomia e Veterinária ? FAV, da Universidade de Brasília - UnB, Campus Universitário Darcy Ribeiro, Brasília, DF, em 2014. Foram realizados testes de germinação padrão em areia e em papel, peso da matéria verde e da matéria seca, envelhecimento acelerado, condutividade elétrica e lixiviados de potássio. Foram encontradas diferenças significativas entre os genótipos para as todas as características avaliadas. Dentre os genótipos avaliados, os híbridos que se destacaram quanto a qualidades fisiológicas desejáveis pelos testes de germinação, condutividade elétrica e lixiviação de potássio foram BRS G42 e SYN 045. Materiais genéticos foram identificados no trabalho para possível exploração em programas de melhoramento. ABSTRACT: This study aims to evaluate, through different tests, the seed physiological quality of sunflower in the second crop in the Brazilian savannah. The tests were carried on in the Seed Laboratory of Veterinary and Agriculture Faculty of University of Brasilia, in 2014. The tests were seedling emergence in sand and paper, green and dry matter weight, accelerated aging, electrical conductivity and potassium leached. Related to the evaluated characteristics, significant differences were found between genotypes. Among them, the hybrids that stood out for the physiologic characteristics through the germination test, electric conductivity and potassium leaching were BRS G42 and SYN 045. Genetic materials were identified in this study for a possible exploration in breeding programs.