Acid Sulfate Soils
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Establishment of homogeneous zones in a soil of alluvial origin
RESUMO A capacidade do solo para manter o crescimento da planta e a actividade biológica reside nas suas propriedades físicas e químicas. O objectivo deste estudo foi observar a distribuição espacial das propriedades químicas do solo como pH, matéria orgânica (MO), condutividade eléctrica (CE), capacidade de troca catiônica eficaz (CTCE) e conteúd
Ciênc. agrotec.. Publicado em: 19/06/2019
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2. Caracterização de Solos Tiomórficos da várzea do Rio Camocim, Caaporã, PB. / Characterization of acid sulfate soils in the floodplain of Camocim river, Caaporã, PB, Brazil.
As áreas de várzeas no Brasil apresentam um grande potencial para a agricultura, no entanto, estas áreas apresentam algumas limitações ao uso agrícola devido à presença de lençol freático elevado e risco freqüente de inundação. Quando localizadas em áreas litorâneas, estas áreas podem sofrer influência marinha podendo apresentar solos tiomó
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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3. Implementação e aplicação de metodologia para dosagem de metais e não metais em águas de drenagem de solo adubados com fosfogesso
Phosphogysum is a waste generated in phosphoric acid production by the wet process. The immense amount of phosphogysum yearly produced (around 150 million tons) is receiving attention from environmental protection agencies all over the word, given its potential of contamination. In Brazil, this material has been used for many decades, especially for agricult
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2010
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4. FitorremediaÃÃo de arsÃnio: disponibilidade do metalÃide no solo e seu acÃmulo em girassol e mamona. / Arsenic phytoremediation: metalloid forms in soils and its accumulation in plants.
The increasing accumulation of arsenic (As) in soils and water bodies has caused increasing concern about human and animal exposure to this metalloid in the environment. As a result, studies assessing the bioavailability of arsenic by different soil extractants and the effect of phosphorus (P) upon this metalloidâs availability, combined with research compa
Publicado em: 2009
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5. Avaliação e disponibilidade de enxofre em solos cultivados com cana-de-açúcar em Pernambuco / Sulfur evaluation and availability in soils cultivated with sugarcane in Pernambuco
Burning sugarcane for harvesting causes expressive volatization of the sulfur in the plant material, worsening possible nutrient deficiencies over the short and medium time-scales. This research aimed to generate data for using mineral gypsum from Araripe-PE region as a sulfur source for sugarcane. Five field experiments were installed in soils of different
Publicado em: 2007
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6. Liberation of sulfate from sulfate esters by soils.
When incubated with acid, alkaline, and neutral soils, a variety of synthetic sulfate esters representing the various classes of these compounds was hydrolyzed by enzymes, probably of microbial origin. The appearance of sulfate in the soil water occurred immediately after introduction into the soils with some esters, whereas with others it occurred only afte
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7. Response of Atmospheric Methane Consumption by Maine Forest Soils to Exogenous Aluminum Salts†
Atmospheric methane consumption by Maine forest soils was inhibited by additions of environmentally relevant levels of aluminum. Aluminum chloride was more inhibitory than nitrate or sulfate salts, but its effect was comparable to that of a chelated form of aluminum. Inhibition could be explained in part by the lower soil pH values which resulted from alumin
American Society for Microbiology.
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8. Atrazine chlorohydrolase from Pseudomonas sp. strain ADP: gene sequence, enzyme purification, and protein characterization.
Pseudomonas sp. strain ADP metabolizes atrazine to carbon dioxide and ammonia via the intermediate hydroxyatrazine. The genetic potential to produce hydroxyatrazine was previously attributed to a 1.9-kb AvaI DNA fragment from strain ADP (M. L. de Souza, L. P. Wackett, K. L. Boundy-Mills, R. T. Mandelbaum, and M. J. Sadowsky, Appl. Environ. Microbiol. 61:3373
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9. Degradation of poly(3-hydroxyoctanoic acid) [P(3HO)] by bacteria: purification and properties of a P(3HO) depolymerase from Pseudomonas fluorescens GK13.
Twenty-five gram-negative bacteria and one gram-positive bacterium capable of growing on poly(3-hydroxyoctanoic acid) [P(3HO)] as the sole source of carbon and energy were isolated from various soils, lake water, and activated sludge. Most of the isolates degraded only P(3HO) and copolymers of medium-chain-length (MCL) hydroxyalkanoic acids (HA). Except for
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10. Nitrous Oxide Emission Associated with Autotrophic Ammonium Oxidation in Acid Coniferous Forest Soil
Aerobic N2O production was studied in nitrifying humus from urea-fertilized pine forest soil. Acetylene and nitrapyrin inhibited both NH4+ oxidation and N2O production, indicating that N2O production was closely associated with autotrophic NH4+ oxidation. N2O production was enhanced by low soil pH; it was negligible above pH 4.7. When soil pH decreased from
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11. Microcosm Enrichment of Biphenyl-Degrading Microbial Communities from Soils and Sediments
A microcosm enrichment approach was employed to isolate bacteria which are representative of long-term biphenyl-adapted microbial communities. Growth of microorganisms was stimulated by incubating soil and sediment samples from polluted and nonpolluted sites with biphenyl crystals. After 6 months, stable population densities between 8 × 109 and 2 × 1011 CF
American Society for Microbiology.