Teste de envelhecimento acelerado em sementes de quiabo

The objective of this research was to study the accelerated aging test to evaluate the okra vigor seed. Were used four okra seed lots cv. "Santa Cruz". The initial seed lot quality was evaluate by the moisture content, germination, first germination count, speed of germination index and seedling emergence. The experiment was carried out in two phases: the first one the seeds were submitted to the accelerate aging with and without NaCl salt solution aging periods of 48, 72, 96 and 120 hours, at 41 and 45(0) C temperature. The second phase the best procedures as for as accelerated aging and temperatures were repeated. The period of 72h and 41 C with and without NaCl saturated solution was the most adequate for the lot classification in distint vigor levels.

Vermiculita como substrato para o teste de germinação de sementes de barbatimão

The objective of this research was to evaluate the use of vermiculite as a substrate for the germination test of 'barbatimao' seeds and to establish what would be the best granulometry and the best moisture intensity to germinate 'barbatimao' seeds. Four replications of 50 seeds were previously scarified with H(2)SO(4) for 60 minutes. Afterwards, the following germination substrates were evaluated: paper rolls moistened with water equivalent to 2.5 times the weight of the dry paper (control); micron, super thin, thin and average sized vermiculite moistened with 0.5, 1.0, 1.5 and 2.0 times the weight of the dry paper. The germination temperature was 30 C. The percentage of normal seedlings was obtained seven days after sowing (first count) and, then, weekly (up to 28 days). Average time and relative distribution of germination were calculated. It was concluded that the germination of 'barbatimao' seeds can be carried out with either fine vermiculite moistened with water equivalent to 2.0 times the weight of the dry paper or average sized substrate moistened with water equivalent to 0.5 to 2.0 times the weight of dry paper. These treatments resulted in higher and faster germination (21 days), similarly to the paper roll method.

Efeito alelopático de extrato aquoso de folhas de Azadirachta indica A. Juss. em alface, soja, milho, feijão e picão-preto

The family Meliaceae has been identified as one of the most promising for biological control, as most species have biologically active compounds. Among the species, the Neem (Azadirachta indica A. Juss) is that stands out most for its efficiency and low toxicity, and it is utilized to control insects, fungi and nematodes. The aim of this work was to verify the allelopathic potential of aqueous extract of fresh leaves of Neem on germination of lettuce, soybeans, maize, beans and Bidens pilosa, as a way to control this weed. The extract was obtained by grinding 200g/L of fresh leaves of the Neem (considered extract 100%) and diluting in distilled water at concentrations of 80, 60, 40, and 20%, and a control with only water. The seeds were kept in the germination chamber at a temperature of 25 degrees C, with photoperiod of 12 hours of light. The aqueous extract affected the germination percentage and average length root of lettuce, with values of 1% and 0.1, cm respectively. For the soybeans, the extract influenced negatively the average time of germination and average speed of germination. There was a drastic reduction of the average root length at higher concentration for soybean, corn and beans. For Bidens pilosa all the parameters analyzed were negatively affected, which means sensitivity to the extract. The bioassay performed in the laboratory showed that the aqueous extract of fresh leaves of Azadirachta indica has allelopathic effect on all species.

Germinação de sementes de Passiflora setacea DC: temperatura, luz e reguladores vegetais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Doses de composto orgânico na produção e qualidade de sementes de brócolis

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Absorção de água, germinação e dormência de sementes de mucuna preta

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Morfologia e germinação de sementes de tamareira-anã (Phoenix roebelenii O'Brien)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Metabolismo germinativo de sementes de Passiflora alata Curtis tratadas com giberelinas e citocinina

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Germinação e aspectos morfológicos de sementes de Dypsis leptocheilos (Hodel) Beentje & J. Dransf. (Arecaceae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Revestimento, qualidade física e fisiológica de sementes de cenoura (Daucus carota L.) cv. Brasília

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Testes de vigor em sementes de quiabeiro

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Disponibilidade hídrica na germinação de sementes e no crescimento de plântulas da leguminosa forrageira Macrotyloma axillare (E. Mey) Verdc. cv. Java

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Morfologia floral e maturação fisiológica de sementes de tamareira-anã (Phoenix roebelenii O'Brien) - Arecaceae

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Condicionamento osmótico e qualidade de sementes de milho doce durante o armazenamento

Pós-graduação em Agronomia (Agricultura) - FCA

Fungicidas e reguladores vegetais nas características fisiológicas e produtivas de alface ‘Vera’

Pós-graduação em Agronomia (Horticultura) - FCA