Danúbia Aparecida Costa Nobre

Qualidade da semente do gergelim preto (Sesamum indicum L.) em diferentes épocas de colheita

The purpose of this study was to evaluate the quality of black sesame seeds harvested at different times after sowing. The seeds used were derived from four different harvest times (122, 129, 136 and 143 days after sowing). The assessment of the quality of the seeds was determined by standard germination, first count germination, seedling length, electrical conductivity and mass of 100 seeds. The data were submitted to variance analysis, and the evaluation of the electrical conductivity used a 4x4 factorial arrangement (four harvesting times x four soaking times), the significant features were submitted to Tukeys test at 5% significance. The time that provides a higher quality of black sesame seeds is shown by the harvest at 136 days after sowing. However, the standardization of the harvest times due to the physiological stage of the plant should be considered, since the number of days for each phase is specific of each condition.

Physiological quality of castor bean seeds originating from different racemes in the plant

The harvesting is one of the most critical phases in castor bean seed production system, once physiological quality of the seeds produced in the different types of racemes in the plant can be affected. The aim of this study was assessing physiological quality of castor bean seeds in function of position of the racemes on plant. Castor bean seeds, cv. IAC-226, harvested separately at distinct periods from primary, secondary, and tertiary racemes, or of mixture of seeds originating from the different types of racemes were used. Soon after harvest, the following determinations were performed: moisture content; 1,000 seeds weight; germination; first count of germination; seedling emergence; emergence speed index; and length and dry matter of seedlings. A completely randomized experimental design was used with four repetitions. Data were subjected to ANOVA and means were compared by Tukey test, at 5% probability. The seeds from primary racemes present higher weight and vigor as compared to seeds produced on other types of racemes. Seeds originating from secondary and tertiary racemes present post-harvest dormancy, being this event more evident on seeds originating from tertiary racemes.

Bioatividade de extratos aquosos de plantas medicinais em sementes de feijão-fava

The aim of this study was to evaluate the bioactivitt of medicinal lants aqueous extracts in Phaseolus lunatus L. (lima bean) s via through physiological and behavioral health. We the llima bean seeds of the variety Anduzinha ins of medicinal lants aqueous extracs ato 5% (Ocimun gratissimum, Plectranthus neachilus, Vernonia condensata, Cymbopogom citratus, Equisetum sp. and Piper aduncum L.) together with the control (distilled water). The bioactivity was determined by physiological and sanitary qutyies reviews through germination, first counting of germination, speed of germination, root length in the first and last counting, and sanity check. We carried out the analysis of variance and the Tukey test at 5% probability. The aqueous extract of Equisetum sp. promoted beseed physiological quality of the lima bean seed. There was a higher incidence of fungs of lima bean sract that received the extract of Plectranthus neacilus).

Perfil de embebição e potencial fisiológico de sementes de soja osmocondicionadas em polietilenoglicol 6000 - DOI:10.5039/agraria.v10i3a4529

O objetivo neste trabalho foi estudar o perfil de embebicao em agua ou em solucao osmotica de polietilenoglicol 6000 e o efeito desse na germinacao e no vigor de sementes de seis cultivares de soja - Confianca, UFV-16, Splendor, Garantia, UFVS 2005 e UFV-18. Os cultivares foram semeados no campo, em Vicosa, Minas Gerais, no delineamento em blocos completos casualizados, sementes foram colhidas no estadio R8, e 15 e 30 dias apos. Amostras de sementes de cada cultivar, epoca de colheita e repeticao foram embebidas em agua destilada (controle) ou em PEG 6000, -0.8 MPa, a 20 °C, por 96 h, a 0.2% do fungicida Captan. O vigor e a viabilidade foram avaliados pela primeira e contagem final do teste de germinacao e velocidade de emergencia em leito de areia. A velocidade de embebicao e a umidade das sementes osmocondicionadas dos seis cultivares e tres epocas de colheita foram menores do que as embebidas em agua. A germinacao e o vigor das sementes osmocondicionadas, de todos os cultivares e epocas de colheita foram maiores, principalmente nas colheitas com atraso de 30 dias, indicando a eficacia do condicionamento em incrementar a germinacao de sementes intemperizadas.

MACAÚBA (Acrocomia aculeata): PALMEIRA DE EXTRAÇÃO SUSTENTÁVEL PARA BIOCOMBUSTÍVEL

A busca por sustentabilidade e crescente em diferentes meios, porem, e na substituicao de combustiveis fosseis por combustiveis renovaveis que se tem o maior enfoque. Encontrar culturas que se demonstrem altamente produtoras de oleo e que tenham alto rendimento e um dos grandes gargalos ao crescimento dos biocombustiveis. Esta revisao literaria vem embasar futuras pesquisas a respeito de uma palmeira altamente produtiva e eficiente na producao de oleo, a macauba. Esta palmeira apresenta uma produtividade media de frutos de 15000 kg ha-1 e rendimento medio em oleo de 4000 kg ha-1, bem superior ao rendimento das oleaginosas mais comumente utilizadas, com a soja, a mamona, o girassol, o algodao e o amendoim, que tendem a apresentar media de produtividade de 1000 kg ha-1. Desta forma, a macauba apresenta todas as caracteristicas para despontar na producao de biocombustivel, pois e uma cultura de elevada sustentabilidade e de extrativismo familiar, alem de, ser encontrada em praticamente todas as regioes do Brasil.