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| Registros recuperados: 81 | |
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| Lima,Pedro Luiz Terra; Silva,Marx Leandro Naves; Quinton,John Norman; Batista,Pedro Velloso Gomes; Cândido,Bernardo Moreira; Curi,Nilton. |
| ABSTRACT Several soil conservation practices are used to reduce water erosion and ensure sustainable agriculture. An effective crop management practice is intercropping, in which two or more crops with different architectures and vegetative cycles are grown simultaneously in the same area. We hypothesized that intercropping of corn and jack-bean increases soil cover and reduce soil erosion by water in comparison to monocropping. The objective of this study was to evaluate the effects of different crop systems on soil cover and on soil erosion by water. Soil and water losses from a Typic Hapludox were measured under the following systems: corn cultivation (CO), jack-bean cultivation (JB), intercropping of corn and jack-bean (IC), and bare soil (BS), as a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intercropping; Soil conservation; Zea mays; Canavalia ensiformis; Linear mixed models. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100511 |
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| Telles,Tiago Santos; Dechen,Sonia Carmela Falci; Guimarães,Maria de Fátima. |
| The problem of soil erosion in Brazil has been a focus of agricultural scientific research since the 19th century. The aim of this study was to provide a historical overview of the institutional landmarks which gave rise to the first studies in soil erosion and established the foundations of agricultural research in Brazil. The 19th century and beginning of the 20th century saw the founding of a series of institutions in Brazil, such as Botanical Gardens, executive institutions, research institutes, experimental stations, educational institutions of agricultural sciences, as well as the creation and diversification of scientific journals. These entities, each in its own way, served to foster soil erosion research in Brazil. During the Imperial period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Historiography; Soil conservation; Land degradation; Soil science. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600001 |
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| Queiroz,Rienni de Paula; Lazarini,Edson; Santos,Marcio Lustosa; Carvalho,Morel de Passos e; Santos,Cristiano. |
| The Cerrado (Brazilian Savannah) plays an important economic and financial role in the nation, since the pastures of this biome feed cattle for half of the domestic bovine meat productivity, and its agricultural fields produce a third of the country's grain. The variability and spatial dependence between the soil physical attributes and soybean yield were evaluated in a crop rotation planted on a degraded brachiaria pasture, on a dystroferric Red Latosol of an experimental farm of the State University of São Paulo (UNESP), in the 2005/2006 growing season. The linear and spatial correlations between these attributes were also studied, to determine conditions that would allow increased agricultural productivity. In the above pasture area, a grid was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Crop rotation; Pasture management; Glycine max (L.) Merrill; Spatial variability. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500012 |
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| Back,Álvaro J.; Pola,Augusto C.; Ladwig,Nilzo I.; Schwalm,Hugo. |
| ABSTRACT This study aimed to determine the rainfall erosivity index in the Valley of Rio do Peixe, in the state of Santa Catarina, Brazil. The data series of three rain gauge stations in the cities of Campos Novos, Videira, and Caçador were used to determine the rainfall erosivity based on the EI30 index and to adjust the equations in order to estimate the EI30 value from the rainfall coefficient. On average, it was observed that erosive rains represents 81.4-88.5% of the annual precipitation. The adjusted equations can be used to estimate rainfall erosivity in locations with only rainfall data. The regional equation specified for the erosivity estimation is EI30 = 74.23 Rc0.8087. The R factor is 8,704.8; 7,340.8; and 6,387.1 MJ mm ha-1 h-1 year-1 for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil loss; Soil conservation; Water erosion; Precipitation. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100774 |
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| Magalhaes,Sulamirtes S. de A.; Ramos,Fabricio T.; Weber,Oscarlina L. dos S.. |
| ABSTRACT Soil carbon (C) stock determination can subsidize discussions on the continuity of an agricultural management. This study aimed to evaluate the stocks of total organic C (STOC) and labile C (SLC), and the indices of C lability (CLI), C compartment (CCI) and C management (CMI), and correlate them with chemical and physical attributes of a Red Yellow Latosol (Oxisol) managed for 38 years with different tillage systems in a Cerrado region of Mato Grosso, Brazil. Disturbed and undisturbed soil samples were collected in three layers (0-0.05, 0.05-0.10 and 0.10-0.20 m). The CMI (CLI x CCI) showed higher STOC possibly as the tillage depth decreased, because none of the tillage systems conserved STOC and SLC in the layers of 0-0.05 and 0.05-0.10 m,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Crop rotation; Soil organic matter. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100085 |
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| Cordeiro,Carlos F. dos S.; Echer,Fábio R.; Pires,Lucas H. T.; Creste,José E.. |
| ABSTRACT Castor bean is an important raw material to produce biofuel in Brazil and can be grown in several regions of the country due to its good adaptation and tolerance to high temperatures and water deficit. The objective of this study was to evaluate the productivity of castor bean plants intercropped at different plant densities with Urochloa ruziziensis. The experiment was conducted in a randomized block design with four replications, using a 4 × 2 factorial arrangement, consisting of four plant densities (13,574, 24,512, 36,816, and 40,723 plants ha-1) of castor bean and two crop systems (single crop, and intercrop with Urochloa ruziziensis). The data were subjected to analyses of variance and regression, and means were compared by the Tukey’s test... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Crop system; Second crop; Soil conservation; Intercrop. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000200109 |
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| Back,Álvaro J.; Pola,Augusto C.; Ladwig,Nilzo I.; Schwalm,Hugo. |
| ABSTRACT Exploring the characteristics of erosive rain is an important aspect of studying erosive processes, and it allows researchers to create more natural and realistic hydrological simulations. The objective of this study was to analyse the characteristics of erosive rain and to determine the temporal distribution pattern of erosive rainfall in the Valley of Rio do Peixe in the state of Santa Catarina, Brazil. Daily pluviograms from the meteorological stations located in the cities Campos Novos, Videira, and Caçador in Santa Catarina from 1984 to 2014 were utilized for this study. By studying rainfall that is classified as erosive, the values of kinetic energy, maximum intensity in thirty minutes, and the value of EI30 erosivity index were determined.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Minimum tillage. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100780 |
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| Rodrigues, Marcio Neves; Santos, Leonardo David Tuffi; Sampaio, Regynaldo Arruda; Fernandes, Luiz Arnaldo. |
| The experiment was conducted in Eutrophic Red-Yellow Ultisol, and aimed to evaluate soil chemical properties in ICLF systems compared with other types of soil use. The study assessed ICLF systems, monocultures of acacia (Acacia mangium), Eucalyptus (Eucalyptus urophylla x E. grandis), Urochloa Brizantha, Urochloa decumbens, Sorghum bicolor and Panicum maximum, with crop variations in three agricultural cycles in a 2 year period, compared to native vegetation, 8-year-old U. Brizantha pasture and degraded pasture of P. maximum with areas of exposed soil. Compared to native forest and well-managed pastures and ICLF systems, contents of organic matter and calcium in the soil were lower in monocultures of eucalyptus, acacia and forage. The fact that the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CIÊNCIAS AGRÁRIAS CIÊNCIA DO SOLO QUÍMICA DO SOLO agroforestry system; Soil conservation; Degraded areas and environmental reclamation. |
| Ano: 2017 |
URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/695 |
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| Telles,Tiago Santos; Dechen,Sonia Carmela Falci; Souza,Luiz Gustavo Antonio de; Guimarães,Maria de Fátima. |
| Soil is an essential natural resource for humans and an important part of the environment. However, soil is often used and managed inappropriately, causing its erosion and degradation, with concomitantly negative social, political and economic impacts. This study aimed to discuss sustainable development; and losses and problems caused by soil erosion, and to suggest a model for assessing erosion costs. The relevance of economic models for costing soil erosion is stressed. Based on an economic theory, it presents a procedure for assessing economic costs of soil erosion, centered on the on-site and off-site costs that are generated. The physical processes of soil erosion are described and their economic effects reviewed, drawing on theoretical and empirical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil degradation; Soil loss; Soil conservation; Sustainable development. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300010 |
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| Silva, Yuri Jacques Agra Bezerra da; Cantalice, José Ramon Barros; Singh, Vijay Pal; Nascimento, Clístenes Williams Araújo do; Wilcox, Bradford Paul; Silva, Ygor Jacques Agra Bezerra da. |
| Metal concentrations in suspended sediments of one of the most polluted rivers in Brazil were measured. Concentrations of Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn were determined by inductively coupled plasma while Hg and As were analyzed with hydride generation flow injection atomic absorption spectroscopy. Contamination of As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, and Zn was assessed using pollution indices, ecological risk assessment, statistical multivariate techniques and comparison with sediment quality guidelines. Suspended sediments of the upstream portion of the Ipojuca River are moderately contaminated, especially with Mn and As. On the other hand, sediments of the downstream section are highly contaminated, mainly with Zn, Pb, and As. Furthermore, the mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: River pollution; Soil conservation; Sediment quality; Trace elements.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42620 |
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| Bittencourt, Henrique Von Hertwig; IAPAR; Lovato, Paulo Emílio; UFSC; Comin, Jucinei José; UFSC; Lana, Marcos Alberto; UFSC; Altieri, Miguel Angel; Universidade da California em Berkeley. |
| Investigou-se o efeito das coberturas de inverno centeio, aveia, azevém, ervilhaca e nabo forrageiro (e suas associações), em sistema de plantio direto, sobre a cobertura do solo e a produção de biomassa das coberturas de inverno, sobre a biomassa de plantas espontâneas de verão, no período crítico de competição, e sobre a produtividade do feijão, cv Guará. O experimento foi instalado em delineamento experimental constituído por blocos ao acaso com quatro repetições. Observaram-se as maiores percentagens de cobertura do solo no inverno, com os tratamentos centeio + ervilhaca, centeio + ervilhaca + nabo forrageiro e aveia + ervilhaca; a produção de biomassa de cobertura foi maior com centeio + ervilhaca + nabo forrageiro. O efeito de supressão observado foi... |
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Palavras-chave: 5.01.03.04-0 Produção de Mudas plantio direto; Plantas espontâneas; Rendimento; Conservação do solo. Fitotecnia no-tillage; Spontaneous plants; Yield; Soil conservation. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/988 |
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| Alencar, Carlos Augusto Brasileiro de; UFV; Oliveira, Rubens Alves de; UFV; Martins, Carlos Eugênio; EMBRAPA; Cóser, Antônio Carlos; EMBRAPA; Figueiredo, José Luis Aguiar; UFV; Cunha, Fernando França da; UFV. |
| Objetivou-se avaliar a cobertura do solo e altura de planta em seis gramíneas manejadas por corte sob efeito de diferentes lâminas de irrigação e estações do ano. O experimento foi conduzido em esquema de parcelas subsubdivididas, tendo seis gramíneas (Xaraés, Mombaça, Tanzânia, Pioneiro, Marandu e Estrela) nas parcelas, seis lâminas de irrigação (0, 18, 45, 77, 100 e 120% da referência) nas subparcelas e as estações (outono/inverno e primavera/verão) nas subsubparcelas. Para diferenciar a aplicação das lâminas de irrigação, utilizou-se o sistema por aspersão em linha. Observou-se efeito das gramíneas, estações anuais e lâminas de irrigação nas duas características estudadas. O capim-Pioneiro apresentou a maior altura e o capim-Estrela a maior cobertura ao... |
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Palavras-chave: 5.01.00.00-9 Agronomia sistema em aspersão em linha; Conservação do solo; B. brizantha; P. maximum; P. purpureum; C. nlemfuensis line source sprinkler system; Soil conservation; B. brizantha; P. maximum; P. purpureum; C. nlemfuensis. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/381 |
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| Silva, Yuri Jacques Agra Bezerra da; Cantalice, José Ramon Barros; Singh, Vijay Pal; Nascimento, Clístenes Williams Araújo do; Wilcox, Bradford Paul; Silva, Ygor Jacques Agra Bezerra da. |
| Metal concentrations in suspended sediments of one of the most polluted rivers in Brazil were measured. Concentrations of Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn were determined by inductively coupled plasma while Hg and As were analyzed with hydride generation flow injection atomic absorption spectroscopy. Contamination of As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, and Zn was assessed using pollution indices, ecological risk assessment, statistical multivariate techniques and comparison with sediment quality guidelines. Suspended sediments of the upstream portion of the Ipojuca River are moderately contaminated, especially with Mn and As. On the other hand, sediments of the downstream section are highly contaminated, mainly with Zn, Pb, and As. Furthermore, the mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: River pollution; Soil conservation; Sediment quality; Trace elements.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42620 |
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| Alencar, Carlos Augusto Brasileiro de; UFV; Cóser, Antônio Carlos; Embrapa - Juiz de Fora; Martins, Carlos Eugênio; Embrapa - Juiz de Fora; Oliveira, Rubens Alves de; UFV; Cunha, Fernando França da; UFV; Figueiredo, José Luis Aguiar; UFV. |
| Objetivou-se avaliar a altura de planta e a cobertura do solo de seis capins irrigados manejados por pastejo sob efeito de diferentes adubações nitrogenadas e estações do ano. O experimento foi conduzido em esquema de parcelas subdivididas, tendo nas parcelas um esquema fatorial 4 x 6 (doses de nitrogênio e forrageiras) e nas subparcelas as estações do ano (outono/inverno e primavera/verão) no delineamento em blocos casualizados, com quatro repetições. As doses nitrogenadas foram de 100, 300, 500 e 700 kg há-1 ano-1, e as forrageiras foram: Xaraés, Mombaça, Tanzânia, Pioneiro, Marandu e Estrela. A altura foi medida desde o solo até as extremidades das folhas e a cobertura estimada visualmente por três observadores. Observou-se efeito dos capins, adubação... |
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Palavras-chave: 5.01.00.00-9 Agronomia Brachiaria brizantha; Panicum maximum; Pennisetum purpureum; Cynodon nlemfuensis; Conservação do solo Brachiaria brizantha; Panicum maximum; Pennisetum purpureum; Cynodon nlemfuensis; Soil conservation. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/319 |
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| Lense,Guilherme Henrique Expedito; Parreiras,Taya Cristo; Moreira,Rodrigo Santos; Avanzi,Junior Cesar; Mincato,Ronaldo Luiz. |
| ABSTRACT Water erosion is one of the main problems faced in coffee cultivation, as it promotes environmental degradation and crop yield decrease. Erosion estimates support the planning of conservation management practices and allowing determining the rates of soil losses. Thus, the objective of this paper was to estimate the soil loss by water erosion using the Erosion Potential Method in a sub-basin predominantly covered by coffee cultivation and then to compare the results with the Soil Loss Tolerance limits. The study area is the Coroado Stream Sub-basin, located at Alfenas Municipality, south of Minas Gerais, Brazil. The sub-basin presented an Erosion Coefficient of 0.272, indicating a predominance of low-intensity erosion. The total soil loss estimate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Modeling.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100225 |
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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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| Registros recuperados: 81 | |
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