302 research outputs found

    Efeito de rotações de cultura sob plantio direto sobre Fusarium spp. e Trichoderma spp. em cultivos de feijoeiro irrigado.

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    O objetivo do trabalho foi determinar a densidade de F. solani, F. oxysporum e Trichoderma spp. em quatro rotações de cultura, sob sistema de plantio direto

    Removal of S. Mansoni in patients with hepatosplenig schistosomiasis: An estimate of the Parasitological load by means of quantitative coproscopy

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    32 Patients with an average age of 18.9 years suffering from schistosomiasis mansoni in its compensated hepatosplenic from who never taken schistosomicidal drugs 'were studied. All the patients were submitted to splenectorrry and filtration of the portal blood for the removal of S. mansoni. A study was made of the relationship between the average number of eggs per gram of faeces obtained from the ana{ysis of 10 successive samples of each patient's faeces b¡r the Kato.,Ifutz method and the number of worms removed from the portal blood. The statistical procedure used revealed a significant relationship between the parameters studied, permitting the establishment of the respective regression equations designed to estimate the numbers of female worms, pairs of ,worms and total worms. From the results and the application of a technique for the constitution of extremé subgroups, the authors propose a classification of the intensity of infection; a) light parasitic load: average number of eggs per gram of faeces less than B0B, corresponding to an estimated parasitic load of less than 226 female worms; b) moderate parasitic load: average number of eggs per gram of faeces between B0B and 3968, corresponding to an estimated. parasitic load. of between 226 and.528 female worms; c) Íntense parasitic load: average number of eggs per gram of faeces greater than 3968, corresponding to an estimated parasitic load greater than 528 female worms. On the basis of the proposed. classification the Authors discuss the indication of specific treatment for schistosomiasis mansoni in patients with the hepatosplenic form of the disease

    Unlocking the potential of Euglena gracilis cultivated in piggery wastewater: biomass production, nutrient removal, and biostimulant potential in lettuce and tomato plants

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    ABSTRACT: Microalgae are increasingly recognized as a valuable resource for bolstering sustainability in agriculture. However, current research and patents primarily focus on Chlorella spp., Scenedesmus spp., and Spirulina spp., thus leaving the vast diversity of microalgae relatively unexplored for agricultural applications. Euglena gracilis (Euglenophyta) is a microalga renowned for its resilience to diverse environmental stressors and capability to produce a variety of bioactive metabolites. This study investigated the potential of cultivating E. gracilis in piggery wastewater for nutrient recycling and as a source of beneficial biomolecules, particularly for biostimulant use. Utilizing raw wastewater diluted to 25% (P25) and pre-treated wastewater with photo-Fenton (PF), the research found that E. gracilis exhibited elevated cell density, biomass concentration, and overall cell health in both wastewaters compared to a synthetic medium (BG11-NPK). This was due to its efficient removal of nutrients, especially ammoniacal-nitrogen and phosphate, resulting in a biomass rich in polyunsaturated fatty acids, amino acids, and paramylon content. The whole-cell biomass significantly enhanced the germination index of lettuce and tomato seeds compared to the water control. Additionally, it promoted cell expansion and root formation in cucumber cotyledons, exhibiting similarities to phytohormones such as gibberellin, cytokinin, and auxin. Furthermore, it is suggested that E. gracilis biomass contains molecules related to resistance to environmental stresses, particularly in tomatoes, given the enhancement in the seedling vigor index. E. gracilis exhibited remarkable adaptability to piggery wastewater, recycling nutrients and yielding biomass rich in bioactive molecules with potential as plant biostimulants. These findings significantly contribute to understanding E. gracilis's potential applications in agriculture and developing a circular bioeconomy.info:eu-repo/semantics/publishedVersio

    Análise de componentes principais de características químicas e físicas de terra preta de índio nos municípios de Magazão e Laranjal do Jari, AP.

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    O objetivo desse trabalho foi realizar uma análise de componentes principais (ACP) em Terra Preta de Índio sob floresta nos municípios de Magazão e Laranjal do Jari, AP

    Pedogenesis on coastal tablelands area with low range altimetry in Paraíba state.

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    Small variations of relief may change drainage and runoff and hence promote the formation of sandy surface horizons and hardened subsurface horizons (fragipans and/or duripans) in Coastal Tablelands soils. This study aimed to investigate the pedogenesis on Coastal Tablelands area with low range altimetry in Paraíba state; secondly, we also sought to contribute to the improvement of the Brazilian Soil Classification System (BSCS). Four soil profiles ware described and collected to be submitted to routine physical and chemical analysis, determination of Fe, Al and Si extracted by sulfuric acid digestion, sodium citrate-bicarbonate-dithionite and acid ammonium oxalate, sodium pyrophosphate, and mineralogical analysis in the sand and clay fractions by X-ray diffractometry. Optical density of the oxalate extract (ODOE) was also determined; the results were statistically evaluated using the R software. Microrelief variations conditioning differentiated water flows, along with the sandy texture of the surface horizons (A and E) and the lower coarse sand/fine sand ratio in the subsurface horizon, seem to promote clay accumulation in depth in the Spodosols developed on Coastal Tablelands environments. For this soils, the argilluvic (argissólico) character at the subgroup level of the BSCS should be incorporated. In addition, Al amorphous mineral phases and/or poorly crystalline play an important role in the formation of strongly cemented horizons (duripans) of the Spodosols, as also reported by other authors. Finally, the ODOE showed to be an efficient indicator of soils under podzolization process, being possible its use as a taxonomic criterion for classification of Spodosols by the BSCS

    Produtos comerciais à base de agentes de biocontrole de doenças de plantas.

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    A publicação organiza as informações técnicas de 135 produtos, as quais foram obtidas nos sítios eletrônicos das empresas produtoras e comercializadoras, universidades, instituições de pesquisa, órgãos fiscalizadores, em periódicos científicos e com responsáveis técnicos de empresas. Entretanto, há necessidade de enfatizar que essa relação de produtos disponíveis pode ser alterada constantemente, tanto devido à entrada, como à retirada dos mesmos do mercado. Os produtos estão reunidos de acordo com o grupo de microrganismos a que pertencem. Dessa forma, são apresentados os produtos à base de fungos, de straminipilas e de bactérias, sendo que dentro de cada grupo foi realizada uma divisão por espécies e em ordem alfabética dos nomes dos produtos comerciais.bitstream/item/66628/1/Doc-88-1.pd

    Avaliação do estado nutricional de agroecossistemas de café orgânico no estado de Minas Gerais.

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    A produção de café orgânico vem se constituindo uma tendência necessária e irreversível do agronegócio brasileiro. Essa atividade tem-se destacado como uma alternativa de renda para alguns cafeicultores, devido à crescente demanda mundial por alimentos mais saudáveis. Entretanto, grande parte das técnicas propostas pela agricultura orgânica está sendo aplicada empiricamente no cultivo de café, principalmente no Estado de Minas Gerais, maior região produtora de café do Brasil. Levando-se em consideração a baixa fertilidade natural dos solos dessa região cafeeira, bem como a elevada extração de nutrientes pelo cafeeiro, objetivou-se neste trabalho identificar possíveis fatores limitantes para a produção orgânica do cafeeiro, relacionados à fertilidade do solo e ao estado nutricional das plantas. Foram realizadas avaliações da fertilidade do solo e análise das folhas em vinte e uma lavouras orgânicas representativas do Estado de Minas Gerais. As amostras de solo foram analisadas para determinação do pH, acidez potencial e dos teores de P, K, Ca, Mg, S, Al e matéria orgânica. As amostras foliares foram analisadas para determinação dos teores de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn e Zn. Com base nos padrões de interpretação para cafeeiros convencionais propostos pela literatura, estabeleceram-se as freqüências com que os caracteres analisados foram inferiores aos critérios de interpretação da fertilidade do solo e estado nutricional das plantas. A análise dos dados foi realizada por estatística descritiva. Novos trabalhos nessa nova área são necessários, visando a uma melhor interpretação da análise foliar e da fertilidade do solo, quando se trabalha com café orgânico
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