Caracterização física de substratos elaborados a partir de resíduos agroindustrias.

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Evaluation of Plant Functional Types Response to Grazing and Fertilizer Levels in Natural Grassland

We report a study on a natural grassland experiment with the objective of finding optimal plant functional types (PFTs) for the description of vegetation response to levels of grazing (ungrazed, grazed) and fertilizer (with, without). The experiment was a split-plot design in randomized blocks, with three replications and the grazing levels in the main plots. Vegetation description was based on species composition and on 12 plant morphology attributes (life-form, growth-form, stem tissue type, leaf cross section, leaf texture, leaf dorsal epidermal surface, leaf ventral epidermal surface, spininess, leaf resistance, leaf width, plant height). Cover-abundance of species was visually estimated. By using a measure of congruence, multivariate analysis and randomization testing, implemented in software SYNCSA, an optimal subset of the attributes was found (plant height, spininess and leaf cross section) that when used to define PFTs composition could express vegetation response to grazing more clearly than species composition did. The same procedure applied for the vegetation response to fertilizer could not find an optimal subset among the 12 attributes evaluated

Estado nutricional do arroz: efeito da época de início de irrigação.

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Absorção de nutrientes pelo arroz em resposta à época de início de irrigação.

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Adubação Nitrogenada para Cultivares de Mamona no Rio Grande do Sul.

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Efeito de iscas tóxicas utilizadas no controle de mosca-das-frutas sobre o estágio adulto do predador Chrysoperla externa (Neuroptera: Chrysopidae).

Este trabalho objetivou avaliar o efeito de iscas tóxicas empregadas no controle de mosca-das-frutas sobre adultos do predador Chrysoperla externa

Seletividade de agrotóxicos recomendados na persicultura ao predador Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae).

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Compatibilidade de milho transgênico com o parasitoide Trichogramma pretiosum.

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