Antonio Dias Robaina

Biometry of fruit and seeds and germination of Magonia pubescens ST.Hil (SAPINDACEAE)

Magonia pubescens is a common native tree species of Brazilian savanna with a great utilization potential because of its economic and ecologic characteristics. The aim of this work was to evaluate the biometrical characteristics of fruit and seeds of this species and its germination potential. It was studied 28 fruit and 293 seeds originated from trees placed in Aquidauana - MS. The study was conducted in the Vegetable Physiology Laboratory and nursery conditions belonged to Faculdade de Ciencias Agrarias (FCA) of Universidade Federal da Grande Dourados (UFGD). There was a large variation in the size, weight and the seed-number of the fruit that presented middle values 6,66 cm of length, 8,14 cm of diameter, 248,21g fresh mass and 13,14 seeds. On the other hand, the seed size variation was smaller than the fruit size variation. The seeds presented middle values 4,81 cm of length, 8,44 cm of width and 3,5 of fresh mass. For the germination study, the seeds received the following treatments: 1) KNO3 1% 24h; 2) KNO3 2% 24h; 3) GA 500 mg. L -1 24h; 4) GA 250 mg L-1 24h; 5) Water 24h; 6) Control. The experiment was set up according to a three-replicate randomized complete design with 6 treatments. The treatment of immersion in water for 24 hours promoted the highest values of emergence percentage (80%). The gibberellins promoted the highest values of aerial part height (meddle of 14,7cm). The highest values of fresh and dry aerial part matter were observed in seedlings originated from seeds treated with GA 500 mg. L -1 (1,26 and 0,24g, respectively). The highest values of fresh and dry cotyledons matter were observed in seedlings originated from seeds treated with KNO3 1% 24h (7,63 and 1,81, respectively). It is recommended to pre-soak of the seeds in water or GA for 24 hours to obtain a greater number of seedlings.

Germination and storage of seeds of Albizia hasslerii (Chod.) Burkart.

The objective of this work was to to evaluate the influence of the temperatures and the pre-germinatives treatments in germination of seeds of Albizia hasslerii. Two experiments had been carried out. In the first experiment the seeds had received the following pre-germinative treatments: immersion in H2SO4 per 10 minutes, H2SO4 per 20 minutes, GA3 150 mg. L-1 for 24 hours and the control, without treatment. For the second experiment, the seeds had been divided in two lots, one of them was sown immediately after the harvest and the other was packed in Kraft paper and stored during 90, 180 and 270 days in conditions of cold chamber and ambient temperature. The seeds had received the following pre-germinative treatments: immersion in sulfuric acid for 20 minutes, in natural water for 24 hours, and the witness. The incubation occurred in temperatures of 18oC, 25oC and 30oC, 20-30oC and in greenhouse, without control of temperature. It was evaluated germination percentage, germination speed index, the length of root and aerial part, and dry mass of seedlings. The experiments had been carried out in randomized complete design, being the first one in factorial arrangement of 6 x 5 and the second in factorial arrangement of 3 x 5 x 4, both with 4 repetitions of 20 seeds. The sulfuric acid treatment for 20 minutes presented the highest values for all the evaluated characteristics. The seeds stored for 90 days in cold chamber had presented germination superior than 50% without any pre-germinative treatment and in any temperature of incubation. Seedlings proceeding from seeds stored in cold chamber had been more vigorous.

Rendimento, teores de óleo e proteínas de quatro cultivares de soja, produzidas em dois locais no estado do Mato Grosso do Sul

Neste trabalho, objetivou-se avaliar o rendimento, teores de oleo e de proteinas nas sementes de quatro cultivares de soja, colhidas em quatro epocas, produzidas em dois locais (Sidrolândia e Dourados) no Estado do Mato Grosso do Sul e em dois anos agricolas (2004/05 e 2005/06). O delineamento experimental utilizado foi em blocos casualizados com tres repeticoes e tratamentos arranjados no esquema de parcelas subdivididas. As parcelas foram constituidas pelas cultivares de soja (BRS 133, BRS 206, BRS 239 e CD 202) e as subparcelas pelas epocas de colheita (R7 e 7, 14 e 21 dias apos o primeiro periodo). Os dados coletados nos diferentes locais foram submetidos a analise de variância conjunta de parcelas subdivididas e, na presenca de interacao significativa, foram realizados os desdobramentos necessarios para os dois anos agricolas, separadamente. Avaliaram-se o rendimento de sementes e a determinacao de oleo e de proteinas brutas. No ano agricola 2004/05, em ambos os locais, as cultivares BRS 206, BRS 239 e CD 202 apresentaram as maiores produtividades. No ano agricola 2005/06, houve diferenca significativa entre locais e Sidrolândia obteve maior rendimento que Dourados, para as quatro cultivares avaliadas. O maior teor de proteinas foi observado na cultivar BRS 206 (35%) e o menor na cultivar CD 202 (31%). A cultivar CD 202 apresentou o maior teor de oleo (22%) e a cultivar BRS 206 foi a que apresentou o menor valor (18%).