22,151 research outputs found

    Cartilha para o produtor de leite de Rondônia. Vol. I: Instalações, sanidade animal e a Instrução Normativa 51.

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    Esta cartilha destina-se ao produtor de leite e tem como principal objetivo trazer um conjunto de orientações técnicas, as quais poderão ser utilizadas na propriedade visando o desenvolvimento da atividade leiteira, considerando também as imposições da Instrução Normativa 51, que deverá ser atendida a partir de julho de 2007 pelos produtores de leite das regiões Norte e Nordeste do país.bitstream/item/24649/1/doc100-cartilhaprodutorleite.pd

    O cultivo do dendezeiro na Amazônia: promessa de um novo ciclo econômico na região.

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    Este trabalho tem como objetivo realizar uma avaliação panorâmica do processo de cultivo do dendezeiro na Amazônia, realizando uma análise da viabilidade endafoclimática para a cultura, identificando as áreas na região norte que melhor atendem as exigências do cultivar. E que neste sentido, são as áreas que despontam com maior capacidade projetada de desenvolvimento da cultura, pois são providas de determinantes que favorecem a expanção do cultivar na região, dentre elas; disponibilidade de áreas e clima. O estudo busca ainda, mostrar a capacidade da cultura do dendezeiro em favorecer o desenvolvimento econômico e loco-social, a partir de investimentos no setor de agroindustrialização dos óleos de Palma e Palmiste, melhoramento de sementes, inserção da agricultura familiar ao processo produtivo, incentivos fiscais e agregação de valor através do processo de agroindustrialização. Visa ainda, mostrar que a ausência de políticas públicas adequadas para o setor pode vir a favorecer a pressões da cultura sobre as matas secundárias ?capoeiras? existentes na Amazônia, assim como o desaparecimento de determinados processos produtivos locais dentre elas: arroz, feijão, milho, boi e farinha de mandioca, favorecendo a elevação dos preços a nível local e regional devido ao efeito da aferta versus procura

    The generator coordinate method in time-dependent density-functional theory: memory made simple

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    The generator coordinate (GC) method is a variational approach to the quantum many-body problem in which interacting many-body wave functions are constructed as superpositions of (generally nonorthogonal) eigenstates of auxiliary Hamiltonians containing a deformation parameter. This paper presents a time-dependent extension of the GC method as a new approach to improve existing approximations of the exchange-correlation (XC) potential in time-dependent density-functional theory (TDDFT). The time-dependent GC method is shown to be a conceptually and computationally simple tool to build memory effects into any existing adiabatic XC potential. As an illustration, the method is applied to driven parametric oscillations of two interacting electrons in a harmonic potential (Hooke's atom). It is demonstrated that a proper choice of time-dependent generator coordinates in conjunction with the adiabatic local-density approximation reproduces the exact linear and nonlinear two-electron dynamics quite accurately, including features associated with double excitations that cannot be captured by TDDFT in the adiabatic approximation.Comment: 10 pages, 13 figure

    Production and economic viability of Kent mango subjected to regulated deficit irrigation in the semi-arid.

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    Mango (Mangifera indica L.) production has great importance for Brazilian agriculture, being concentrated in the states of Bahia and Pernambuco. Although mango is a drought-tolerant crop, inadequate irrigation management reduces its yield. Thus, the objective was to evaluate production parameters and economic viability of ‘Kent’ mango subjected to controlled water deficit in the phenological stages of flowering, fruit growth and maturation. The experiment was conducted in the municipality of Petrolina/PE, semi-arid region of the São Francisco Valley, in a ultisol. The experimental design was randomized blocks, in a triple factorial scheme, with application of four irrigation depths (40, 60, 80 and 100% of crop evapotranspiration -ETc), three phenological stages (F1 -flowering, F2 -fruit growth, F3 -fruit maturation) and two production cycles (2018 and 2019 seasons), with four replicates, each of which consisting of four plants. The irrigation with 40% ETc in the flowering stage and 80% of the ETc in the growing and ripening of fruits phases promoted higher yield, water use efficiency and benefit/cost ratio in the cultivation of ‘Kent’ mango in the Brazilian semi-arid region

    Caracterization of seed germination of Zephyranthes sylvatica (Mart.) Baker (Amarilidacea).

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    Zephyranthes sylvatica is a beautiful lily, endemic from the Brazilian Caatinga. Although it has a great ornamental potential, little is known about this species, especially regarding its seeds germination process. Aiming to characterize the germination of Z. sylvatica seeds, we studied its imbibition curve, optimum temperature and substrate for germination and seedling emergence, osmotic and salt stress tolerance, as well as the tolerance to frosting/ defrosting, which indicates long term cryostorage potential. The germination of Z. sylvatica presents a triphasic model of imbibition, in which the primary root protrusion occurs after 72 hours of imbibition. The ideal conditions for evaluating seed germination of Z. sylvatica is 25 °C, in paper rolls. These seeds are highly tolerant to osmotic stress, but not to salt stress. Z. sylvatica seeds can be cryopreservated without loss of germination and seed vigor

    Efeito de diferentes tipos de poda no pegamento de frutos de pessegueiro em Pelotas/RS.

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