Cultivo do coqueiro gigante associado à exploração de ovinos em áreas de baixada litorânea no Nordeste do Brasil.

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Crescimento e algumas características nutricionais do capim-gengibre (Paspalum maritimum Trind.)

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Variabilidade entre isolados de Trichoderma spp. quanto à capacidade de inibir o crescimento de Cylindrocladium sp. em cultivo pareado.

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Produção orgânica consorciada de tomate e plantas aromáticas ou repelentes.

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Efeito do corte da parte aérea na sobrevivência do marmeleiro (Croton sonderianus Muell. Arg.).

Resumos: O trabalho foi conduzido na Embrapa Caprinos, em Sobral, Ceará, com o objetivo de avaliar os efeitos do corte da parte aérea em relação à altura da rebrota na sobrevivência, persistência e no vigor da rebrota do marmeleiro e produção subseqüente de fitomassa do estrato herbáceo. O corte das plantas foi realizado a 10,0 cm de altura, quando suas rebrotas alcançaram quatro diferentes alturas (25, 50, 75 e 100 cm). Os tratamentos de corte foram aplicados em parcelas de 5 m x 30 m. A avaliação da mortalidade das plantas foi realizada mediante a contagem de todas as plantas mortas e vivas dentro das parcelas experimentais. Os dados foram analisados por intermédio do teste não-paramétrico do qui-quadrado. Verificou-se que houve dependência entre a mortalidade das plantas e o corte das rebrotas e que todos os tratamentos foram diferentes entre si. O melhor resultado foi alcançado quando as rebrotas foram cortadas à altura média de 75 cm, diminuindo a densidade do marmeleiro em até 96%. A redução da densidade proporcionou aumentos significativos na produção de fitomassa herbácea, em relação à área não tratada. Effects of the Cutting of Above Ground Parts on Marmeleiro (Croton sonderianus Muell. Arg.) Survival. ABSTRACT - The research was conducted at the EMBRAPA - National Center for Goat Research, in Sobral, Ceara, Brazil, to evaluate the effects of cutting of the above ground parts in relation at regrowth height of marmeleiro on its survival, persistence, regrowth vigor and subsequent production of herbaceous understory phytomass. The plants were cut at 10.0 cm above ground, when the regrowth reached four different heights (25, 50, 75 and 100 cm). The cutting treatments were applied on plots of 5 m x 30 m. The evaluation of the mortality of the plants was accomplished by the count of the total number of dead and alive plants of the experimental plots. Data were analyzed by means of the chi-square nonparametric test. It was observed dependence between mortality of the plants and regrowth cutting, where all treatments were different. Best results were obtained when regrowth plants were cutting to a medium height of 75 cm, which decreased marmeleiro density by 96%. The reduction of density provided a significant increase on herbaceous understory phytomass in relation to control treatment

Environmental effects in the quantum-classical transition for the delta-kicked harmonic oscillator

We discuss the roles of the macroscopic limit and of different system-environment interactions in the quantum-classical transition for a chaotic system. We consider the kicked harmonic oscillator subject to reservoirs that correspond in the classical case to purely dissipative or purely diffusive behavior, in a situation that can be implemented in ion trap experiments. In the dissipative case, we derive an expression for the time at which quantum and classical predictions become different (breaking time) and show that a complete quantum-classical correspondence is not possible in the chaotic regime. For the diffusive environment we estimate the minimum value of the diffusion coefficient necessary to retrieve the classical limit and also show numerical evidence that, for diffusion below this threshold, the breaking time behaves, essentially, as in the case of the system without a reservoir.Comment: 16 pages, 13 figures. Accepted for publication in Phys. Rev.

Competitiveness of the soybean complex in Brazil: enhancers and inhibitors.

The objective of this study was to analyze the competitiveness of the soybean complex in Brazil from 2002/2003 to 2012/2013, assessing the likely rational grounds for explaining this evolution. Using the Revealed Comparative Advantage (RCA) model, as an indicator of competitive measure, we found that the soybean complex exports hold a strong position in the worldwide context for the years under consideration. This study proposes that the main reasons or enhancement factors for this progress may be based on two factors: knowledge & technology, and legislation. Despite the fact that soybean complex has evolved considerably in the past decades, there are inhibitors to be considered, such as problems in transport logistics and storage capacity limitations, both challenging issues which the last government mandates have been struggling with