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| Carvalho Filho,Amaury de; Curi,Nilton; Marques,João José Granate de Sá e Melo; Shinzato,Edgard; Freitas,Diego Antonio França de; Jesus,Elen Alvarenga de; Massahud,Regla Toujaguez La Rosa. |
| A mineralogia dos óxidos de Mn é muito variada e complexa, devido ao grande número de minerais e ao conhecimento inexato de algumas de suas estruturas. Devido à escassez de trabalhos que tratam especificamente de óxidos de Mn em solos brasileiros e seu conteúdo muito elevado em alguns solos do Quadrilátero Ferrífero (MG), este estudo objetivou caracterizar a química e a mineralogia desses óxidos nos solos dessa região, estratificando-os conforme os materiais de origem e posições na paisagem. O trabalho foi desenvolvido em uma área representativa do Quadrilátero Ferrífero, referente à Área de Proteção Ambiental da Região Metropolitana de Belo Horizonte - APA Sul RMBH, com extensão de 1.625,32 km²; a amostragem foi direcionada para a caracterização de solos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caracterização química; Mineralogia; Todoroquita; Litioforita; Pirolusita; Solos ricos em Mn. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300015 |
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| Dias,Adriana Cristina; Silva,Marx Leandro Naves; Freitas,Diego Antonio França de; Batista,Pedro Velloso Gomes; Curi,Nilton; Carvalho,Gabriel José de. |
| Water erosion is responsible for soil, water, carbon and nutrient losses, turning into the most important type of degradation of Brazilian soils. This study aimed to evaluate the influence of three cover plants under two tillage systems on water erosion control in an Argisol at south of Minas Gerais state, Brazil. The cover plants utilized in the study were pigeon pea, jack bean and millet, under contour seeding and downslope tillage. Experimental plots of 4 x 12 m, with 9% slope, under natural rainfall were used for the quantification of losses of soil, water, nutrients, and organic matter. One experimental plot was kept without plant cover (reference). Higher erosivity was observed in December and January, although a great quantity of erosive rainfall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Tillage systems; Vegetal cover; Erosivity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000500004 |
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| Aquino,Regimeire Freitas; Silva,Marx Leandro Naves; Freitas,Diego Antonio França de; Curi,Nilton; Avanzi,Junior Cesar. |
| Rainfall erosivity is one of the main factors related to water erosion in the tropics. This work focused on relating soil loss from a typic dystrophic Tb Haplic Cambisol (CXbd) and a typic dystrophic Red Latosol (LVdf) to different patterns of natural erosive rainfall. The experimental plots of approximately 26 m² (3 x 8.67 m) consisted of a CXbd area with a 0.15 m m-1 slope and a LVdf area with 0.12 m m-1 slope, both delimited by galvanized plates. Drainpipes were installed at the lower part of these plots to collect runoff, interconnected with a Geib or multislot divisor. To calculate erosivity (EI30), rainfall data, recorded continuously at a weather station in Lavras, were used. The data of erosive rainfall events were measured (10 mm precipitation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rainfall erosivity; Water erosion; Kinetic energy; Soil erodibility. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100022 |
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| Aquino,Regimeire Freitas; Silva,Marx Leandro Naves; Freitas,Diego Antonio França de; Curi,Nilton; Mello,Carlos Rogério de; Avanzi,Junior Cesar. |
| Rainfall erosivity and its spatial variability were studied for 54 pluviometric stations in Southern Minas Gerais State (48º00' - 44º00'W; 23º50' - 20º00'S), aiming to plan the land-use strategies. Therefore, erosivity factor was determined for the pluviometric stations, using long-term rainfall data sets obtained along with the Brazilian National Water Agency- ANA, which varied from 15 to 40 years. The monthly and annual erosivity indexes were generated using Fournier equation for Lavras, MG and the spatial distribution of rainfall erosivity was studied on the basis of geostatistical approaches considering only the distance which separates them, developing the isotropic experimental semivariogram. The semivariogram adjustment was done based on the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosive potential; Soil sustainability; Kriging. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000500006 |
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