Insetos associados às sementes e frutos de espécies da arborização de Curitiba, PR.

Resumo

Macauba production estimated by regression models.

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Produção de mudas de maracujá-doce.

ABSTRACT: The sweet passion fruit could be propagated by seeds, cuttings, grafting and micro propagation. Seeds and cuttings propagation, are more usual. Most commercial plants are produced by seeds, although, these two methods have specific aspects, and choice between them will depend on the goals and facilities that will be needed to do that. Propagation by seeds will require careful stock choice, because of incompatibility between plants originated from seeds with common stocks. Seeds should be sown immediately after removing from the fruit free of pulp. Besides taking care of productive and phytosanitary aspects, the stocks must be heterogeneous, due to incompatibility problems with future generations. The same purpose must be applied to cuttings stocks that even may need only artificial pollination. The choice of right containers, growing medium, preventive pest and disease management, irrigation system, adequate and cleaned facilities, are important factors that must be taken in consideration for successful quality plant production.bitstream/CPAC-2009/26784/1/doc_93.pd

Estudos de toxidez de alumínio em genótipos de soja e milho cultivados em bioensaios,

A soja (Glycine max) e o milho (Zea mayz) são culturas importantes para o desenvolvimento sócio-econômico do Rio Grande do Sul. Um fator que pode afetar a produtividade destas culturas é a presença de alumínio em níveis tóxicos que ocorre, principalmente, em solos ácidos. A utilização de genótipos adaptados é uma estratégia para o manejo integrado dos cultivos em solos ácidos. O presente estudo teve como objetivo determinar as concentrações de cálcio e aluminio adequadas a realização de bioensaios para a classificação de genótipos de soja e milho quanto a tolerância à toxidez de aluminio. Foram utilizados três genótipos de soja (6001, 8100 e AL 72.) e dois genótipos de milho (P3081 e TRAKTOR). Os genótipos foram cultivados, pela técnica de bioensaios, em diferentes concentrações de cálcio e alumínio. A concentração de 2,5 mmol dm-3 de cálcio foi adequada para a realização de estudos em bíoensaios nos genótipos de soja e milho, não promovendo restrições no crescimento da raiz principal. A concentração de 0,005 mmol dm-3 de alumínio para soja e 0,025 mmol dm-3 de alumínío para milho, combínadas com 2,5 mmol dm-3 de cálcio permitem diferenciar os genótipos de soja e milho em uma escala de tolerância ao alumini

Evaluation of potential ethanol production and nutrients for four varieties of sweet sorghum during maturation.

Sweet sorghum was investigated to an alternate feedstock for fuel ethanol production. juices from 4 sorghum varieties (BRS 506, BRS 508, BRS 509, BRS 511 and BRS); all developed by Embrapa (Brazilian Agricultural Research Corporation) Maize and Sorghum) were evaluated for sugar, starch and nutrient contents and theoretical ethanol yields. The levels of nitrogen, phosphorus, calcium, magnesium, starchand sugars (glucose, fructose and sucrose) were measured weekly over a period of 70 days. Fermentations were performed using yeast Saccharomyces cerevisiae. BRS 508, BRS 509 and BRS 511 showed potential to be useful for industrial applications for maturities exceeding 30 days. BRS 511 showed the highest sugar production, with levels higher than 140 g/L during the majority of the experiment and reaching a maximum of 191 g/L. All varieties showed similar behaviors with respect to nutrient content, which was characterized by a decrease in nutrient concentrations over the period analyzed. Juice from BRS 508 was successfully fermented within 8 h with a productivity (9.0 g/L h) and yield (90.5% of theoretical) similar to those observed for sugar cane juice