This study proposed a method for identifying areas appropriate for fish farming in ground-excavated ponds using data obtained from public institutions. The method was applied to three cities located in the central-southern region of Paraná State, Brazil. In order to select appropriate areas, a geographic information system (GIS) was created using data from a digital elevation model (DEM), as well as data on soil occupation and type. A variable reclassification model (VRM) was created, and the analytic hierarchy process (AHP) method was applied to establish weights for a multi-criteria assessment of the factors. Non-classifiable areas and areas with constraints were identified and removed from the analysis. The sites classified as highly suitable or suitable represented 33.270.79 ha (18.71% of the total area), while the restricted areas represented 54,427.91 ha (30.60% of the total area). This method may represent a useful tool for decision making in the context of regional planning and may be used in the establishment of public policy and in the allocation of resources for aquaculture development.
The use of non-host cover crops is a key strategy for controlling root-knot nematodes in infested fields. However, pathogenicity of nematodes to cover crops may vary between populations and localities. This study assessed the response of green manure species and millet (Pennisetum glaucum (L.) R.Br.) cultivars to four populations of Meloidogyne javanica (denominated Mj-2, Mj-3, Mj-6 and Mj-7). Seedlings of radish (Raphanus sativus L.), pigeon pea (Cajanus cajan (L.) Huth) 'IAPAR 43', buckwheat (Fagopyrum esculentum Moench) 'IPR 92-Altar' and millet 'BRS 1501', 'ADR 300' and 'ADR 500' were inoculated with 1000 eggs and second-stage juveniles of M. javanica. Soybean (Glycine max (L.) Merr.) 'M6210 IPRO' was used as control. At 60 d after inoculation, plants were evaluated for root fresh weight, gall index (GI), number of nematodes per gram of root and reproduction factor (RF). For GI, Mj-3 and Mj-6 were the most aggressive to soybean (GI = 5.0). In pigeon pea, Mj-7 resulted in the highest GI (3.5). Radish had the lowest GI (0.67) with Mj-2. For buckwheat, Mj-3 was the most aggressive population, with a GI of 4.50. Mj-3 and Mj-7 resulted in the highest GI in 'ADR 300', and Mj-6 and Mj-7 in 'ADR 500'. The reproductive ability of nematode populations differed between hosts. Mj-2 was the most pathogenic to 'ADR 300' (RF = 10.88), Mj-3 to buckwheat (RF = 53.46) and radish (RF = 4.81), Mj-6 to 'ADR 500' (RF = 19.58) and Mj-7 to pigeon pea (RF = 2.99) and 'BRS 1501' (RF = 15.05). Soybean was susceptible to all M. javanica populations (RF = 33.69 to 257.22). Green manure species and millet cultivars varied in their responses to M. javanica populations of different origins.
ResumoOs biodigestores permitem transformar resíduos poluidores em energia e biofertilizante. Dentre os diferentes tipos de biodigestores, surgiu recentemente o modelo Bioköhler, amplamente utilizado na região Oeste do Paraná e que ainda é pouco estudado. Este trabalho buscou avaliar a influência da temperatura na produção de biogás a partir de dejetos da bovinocultura de leite.O experimento foi realizado entre os dias 17/12/2012 e 02/03/2013, em um biodigestor de 20 m 3 localizado na Estação Experimental Antonio Carlos dos Santos Pessoa, pertencente à UNIOESTE -Campus de Marechal Cândido Rondon. Foram obtidos os dados de temperatura interna e externa do biodigestor, volume de biogás produzido e teor de CH4, CO2 e outros gases presentes no biogás. Os resultados indicam que a temperatura média interna se manteve dentro da faixa mesofílica e que somente a temperatura média da região superior não seguiu o comportamento da temperatura externa ao biodigestor, os resultados também mostram que os teores dos gases, entre uma semana e outra, acompanharam a produção média de biogás, e esta produção foi influenciada pela variabilidade da temperatura interna e externa do biodigestor.
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