Efeito da rotação de culturas na atividade enzimática total do solo.

O objetivo do trabalho foi avaliar a atividade enzimática do solo, em rotações de culturas envolvendo espécies de feijão, milho, braquiária e milheto

Teores de nitrogênio e de clorofilas em folhas de feijão e de soja inoculados com rizóbios.

Com o objetivo de avaliar os teores de nitrogênio total e de clorofila total em plantas de feijão e de soja conduziu-se um experimento em Goiânia-GO, utilizando delineamento inteiramente casualizado com três repetições

Consórcio.

Desde quando o consórcio é utilizado no Brasil? O cultivo consorciado do feijoeiro é característico de pequenas áreas? Por que o cultivo consorciado do feijoeiro é vantajoso para o produtor? O que são cultivos múltiplos? Que culturas são mais recomendadas para o sistema de plantio consorciado com o feijoeiro? No sistema de cultivo de consórcio de feijão com milho, o feijão deve ser semeado antes ou depois do milho? Quais são os arranjos das plantas de feijão e de milho recomendados pela pesquisa no cultivo consorciado? Economicamente, existem diferenças entre esses dois arranjos? Que densidades de plantas de feijão e de milho são mais adequadas ao cultivo consorciado? Como determinar as quantidades de sementes de feijão e de milho a serem distribuídas por metro, no cultivo consorciado? As cultivares de feijão recomendadas para o cultivo em consórcio são as mesmas recomendadas para o monocultivo? Em consórcio de feijão com milho, ocorre menor incidência de insetos-praga? Há alguma recomendação de adubação específica para o cultivo consorciado do feijão com o milho? Como se faz o controle de plantas daninhas em lavouras consorciadas de feijão com milho? A prática de dobramento do milho consorciado com feijão é eficiente no que se refere a ganhos de produtividade destas culturas? Há algum resultado de pesquisa sobre cultivo consorciado de feijão com mandioca e feijão com soja? O feijão tem sido recomendado como cultura intercalar em regiões de lavouras cafeeiras? Quais são as principais vantagens do cultivo consorciado irrigado durante o período outono/inverno? O que é o índice de equivalência de área (IEA)? Como se interpreta o IEA?bitstream/item/123560/1/p89.pd

Nodulação em raízes de feijão e soja inoculados com rizóbios em dois estádios fenológicos.

Este trabalho se propôs a avaliar a nodulação em plantas de feijão e soja em dois estádios fenológicos.Resumo 1020

Taxing the Informal Economy: The Current State of Knowledge and Agendas for Future Research

This paper reviews the literature on taxation of the informal economy, taking stock of key debates and drawing attention to recent innovations. Conventionally, the debate on whether to tax has frequently focused on the limited revenue potential, high cost of collection, and potentially adverse impact on small firms. Recent arguments have increasingly emphasised the more indirect benefits of informal taxation in relation to economic growth, broader tax compliance, and governance. More research is needed, we argue, into the relevant costs and benefits for all, including quasi-voluntary compliance, political and administrative incentives for reform, and citizen-state bargaining over taxation

Does social capital travel? Influences on the life satisfaction of young people living in England and Spain

<p>Abstract</p> <p>Background</p> <p>This study used a social capital framework to examine the relationship between a set of potential protective ('health assets') factors and the wellbeing of 15 year adolescents living in Spain and England. The overall purpose of the study was to compare the consistency of these relationships between countries and to investigate their respective relative importance.</p> <p>Methods</p> <p>Data were drawn from the 2002, English and Spanish components of the WHO Health Behaviour in School-Aged Children (HBSC) survey A total of 3,591 respondents (1884, Spain; 1707, England) aged 15, drawn from random samples of students in 215 and 80 schools respectively were included in the study. A series of univariate, bivariate and multivariate (general linear modelling and decision tree) analyses were used to establish the relationships.</p> <p>Results</p> <p>Results showed that the wellbeing of Spanish and English adolescents is similar and good. Three measures of social capital and 2 measures of social support were found to be important factors in the general linear model. Namely, family autonomy and control; family and school sense of belonging; and social support at home and school. However, there were differences in how the sub components of social capital manifest themselves in each country--feelings of autonomy of control, were more important in England and social support factors in Spain.</p> <p>Conclusions</p> <p>There is some evidence to suggest that social capital (and its related concept of social support) do travel and are applicable to young people living in Spain and England. Given the different constellation of assets found in each country, it is not possible to define exactly the precise formula for applying social capital across cultures. This should more appropriately be defined at the programme planning stage.</p

Functional Inequality in Latin America: News from the Twentieth Century

We report on a novel approach for the measurement of gas adsorption in microporous solids using X-ray computed tomography (CT) that we refer to as digital adsorption. Similar to conventional macroscopic methods, the proposed protocol combines observations with an inert and an adsorbing gas to produce equilibrium isotherms in terms of the truly measurable quantity in an adsorption experiment, namely the surface excess. Most significantly, X-ray CT allows probing the adsorption process in three dimensions, so as to build spatially-resolved adsorption isotherms with a resolution of approximately 10 mm3 within a fixed-bed column. Experiments have been carried out at 25 C and in the pressure range 1-30bar using CO2 on activated carbon, zeolite 13X and glass beads (as control material), and results are validated against literature data. A scaling approach was applied to analyze the whole population of measured adsorption isotherms (~7600), leading to single universal adsorption isotherm curves that are descriptive of all voxels for a given adsorbate-adsorbent system. By analyzing the adsorption heterogeneity at multiple length scales (1 mm3 to 1 cm3), packing heterogeneity was identified as the main contributor for the larger spatial variability in the adsorbed amount observed for the activated carbon rods as compared to zeolite pellets. We also show that this technique is readily applicable to a large spectrum of commercial porous solids, and that it can be further extended to weakly adsorbing materials with appropriate protocols that reduce measurement uncertainties. As such, the obtained results prove the feasibility of digital adsorption and highlight substantial opportunities for its wider use in the field of adsorptive characterization of porous solids