Preventative Weed Management Strategies in Arkansas Tomato Production

Cost-effective weed suppression is an important consideration for tomato growers. Growers often choose methods which minimize hand labor, as hand weeding can be prohibitively expensive. This project determined economic viability of high tunnel tomatoes treated with several methods of weed control, both organic and chemical. These methods included: 2-week hand weeding, 1-week hand weeding, preemergent herbicide application (plots sprayed with herbicide prior to weed emergence), straw mulch (plots bedded with straw), landscape fabric (plots covered in fabric), and untreated weedy control plots. These six treatments were applied to randomized blocks in a high tunnel. Weeding, planting, and harvesting were all timed to determine time costs of weed management strategy implementation. After harvest, marketable and cull yield were measured. Means separation analysis using Tukey’s test was used to compare data, indicating differences in the management strategies. The data showed that the preemergent herbicide-treated plots tended to be similar to the organic treatments in terms of yield, weed coverage, and implementation time, but not preparation time. Landscape fabric was especially suppressive of weeds. 1-week and 2-week hand weeded plots had similar values for yield, weed coverage, and implementation time. As expected, 1-week and 2-week hand weeding took more weeding time overall than the other treatments. These results are relevant to growers in that the results can be used to adjust their weed management practices based on their available material and labor resources, and yield expectations

Reconstrução de sinal de medida em sistema de medida de pressão em células vegetais.

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Instrumento de avaliação para otimizar a comunicação interna na Unidade de trabalho.

A comunicação, do ponto de vista empresarial, pode ser entendida como função indispensável de pessoas e organizações, através da qual se conduz uma relação com o meio ambiente, com os outros e com suas próprias partes, mediante processos internos. Entende-se, por isso, que o equilibrio da organização está na disposição ordenada entre as partes que a compõem. Esse equilibrio e integração dependem fundamentalmente do seu processo comunicacional, ou seja, ao se organizar, uma empresa organiza, de fato, o fluxo de informações a ela relacionadas. Assim, estarão organizando suas relações humanas, administrativas e estratégicas entre suas partes funcionais.bitstream/CNPDIA/8888/1/CT09_96.pd

Abordagem de sistemas de controle para desenvolvimento de instrumento de medida de pressão intracelular.

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Novo instrumento automático para medida de pressão intracelular em vegetais.

Neste trabalho será mostrado como o modelo do instrumento é utilizado de forma a auxiliar no projeto de uma sonda de pressão automática, além dos resultados práticos obtidos em experimentos de bancada para caracterização da sonda. A versão da sonda de pressão usada para o trabalho foi a de compensação térmica e a automação é baseada na teoria de Sistemas de Controle.bitstream/CNPDIA/8123/1/CiT17_2002.pd

Modelo Validado de Sonda de Pressão para Medida de Relações de Água em Plantas.

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Evaluation of operational parameters on the precipitation of endoglucanase and xylanase produced by solid state fermentation of Aspergillus niger

In order to develop cost effective processes for converting biomass into biofuels, it is essential to improve enzyme production yields, stability and specific activity. In this context, the aim of this work was to evaluate the concentration of two enzymes involved in the hydrolysis of biomass, endoglucanase and xylanase, through precipitation. Statistical experimental design was used to evaluate the influence of precipitant agent concentration (ammonium sulfate and ethanol), aging time, and temperature on enzyme activity recovery. Precipitant agent concentration and aging time showed a statistically significant effect at the 95% confidence level, on both enzyme activity recoveries. The recovery of endoglucanase with ammonium sulfate and ethanol reached values up to 65 and 61%, respectively. For xylanase, the recovery rates were lower, 27 and 25% with ammonium sulfate and ethanol, respectively. The results obtained allowed the selection of the variables relevant to improving enzyme activity recovery within operational conditions suitable for industrial applications.1726Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

The Future of Government: Lessons Learned from around the World

The report provides a summary of the discussions that have taken place within the framework of Forum activities on how the strategies, structures and practices of governments must change in the coming years, and how new networks and technologies can be leveraged to transform government capacity. It includes a series of policy briefs, which distils some of the most current and vital information for government modernization available, and concludes with case studies from around the world

Modelagem e automação de uma sonda termoelástica para medidas de parâmetros relativos a fisiologia vegetal.

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