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Altura de capins e cobertura do solo sob adubação nitrogenada, irrigação e pastejo nas estações do ano - DOI: 10.4025/actasciagron.v32i1.319 Agronomy
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...
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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Lâminas de irrigação e estações anuais na cobertura do solo e altura de gramíneas cultivadas sob corte - DOI: 10.4025/actasciagron.v31i3.381 Agronomy
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...
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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Effect of 15n-labeled hairy vetch and nitrogen fertilization on maize nutrition and yield under no-tillage¹ Rev. Bras. Ciênc. Solo
Almeida Acosta,José Alan de; Amado,Telmo Jorge Carneiro; Neergaard,Andreas de; Vinther,Mads; Silva,Leandro Souza da; Silveira Nicoloso,Rodrigo da.
This study evaluated the effect of hairy vetch (Vicia villosa Roth) as cover crop on maize nutrition and yield under no tillage using isotope techniques. For this purpose, three experiments were carried out: 1) quantification of biological nitrogen fixation (BNF) in hairy vetch; 2) estimation of the N release rate from hairy vetch residues on the soil surface; 3) quantification of 15N recovery by maize from labeled hairy vetch under three rates of mineral N fertilization. This two-year field experiment was conducted on a sandy Acrisol (FAO soil classification) or Argissolo Vermelho distrófico arênico (Brazilian Soil Classification), at a mean annual temperature of 18 ºC and mean annual rainfall of 1686 mm. The experiment was arranged in a double split-plot...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil conservation; 15N recovery; Cover crops; N uptake.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400028
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Atributos físico-hídricos na camada superficial de solos em diferentes posições na paisagem e sistemas de colheita de cana-de-açúcar em Coruripe, AL. Infoteca-e
AMARAL, A. J. do; MARQUES, F. A.; PARAHYBA, R. da B. V.; OLIVEIRA NETO, M. B. de; SILVA, A. B. da; BARROS, A. H. C.; NASCIMENTO, A. F. do; IVO, W. M. P. de M..
O objetivo deste trabalho foi determinar alguns atributos físico-hídricos na camada superficial do solo relacionados à retenção, armazenamento e disponibilidade de água para as plantas, em uma topossequência de solos sob diferentes sistemas de colheita de cana-de-açúcar, em comparação a uma área de referência de floresta subperenifólia, em Coruripe, AL.
Tipo: Documentos (INFOTECA-E) Palavras-chave: Atributos do solo; Manejo do Solo; Conservação do Solo; Cana de Açúcar; Soil management; Soil conservation; Sugarcane.
Ano: 2018 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1101191
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Factors Affecting the Adoption of Soil Conservation Measures: A Case Study of Fijian Cane Farmers AgEcon
Asafu-Adjaye, John.
This study explored the extent to which various factors affect Fijian cane farmers’ adoption of soil conservation measures. The significant factors affecting perception of the soil erosion problem include age, education, ethnicity, and extension services. On the other hand, the significant factors affecting soil conservation effort include perception of the erosion problem, net farm income, farm size, land type, and extension services. In general, personal characteristics appear to affect perceptions of soil erosion while the extent of conservation effort is affected by economic and physical factors. The resulting implications for soil conservation policy are discussed.
Tipo: Journal Article Palavras-chave: Fiji; Ordered probit model; Soil conservation; Soil erosion; Sugarcane; Farm Management; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/36710
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Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile; Intermediate Results Dissemination Workshop February 5-6, 2009, Addis Ababa, Ethiopia AgEcon
Awulachew, Seleshi Bekele; Erkossa, Teklu; Smakhtin, Vladimir U.; Fernando, Ashra.
Tipo: Conference Paper or Presentation Palavras-chave: River basin management; Watershed management; Farming systems; Water balance; Reservoirs; Water supply; Irrigation requirements; Irrigation programs; Simulation models; Sedimentation; Rainfall-Runoff relationships; Erosion; Soil water; Water balance; Soil conservation; Institutions; Organizations; Policy; Water governance; International waters; Institutional and Behavioral Economics; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/118389
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Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile; Intermediate Results Dissemination Workshop February 5-6, 2009, Addis Ababa, Ethiopia AgEcon
Awulachew, Seleshi Bekele; Erkossa, Teklu; Smakhtin, Vladimir U.; Fernando, Ashra.
Tipo: Conference Paper or Presentation Palavras-chave: River basin management; Water governance; Environmental flows; Simulation models; Reservoirs; Sedimentation; Rainfall-Runoff relationships; Hydrology; Water balance; Erosion; Soil conservation; Watersheds; Irrigation schemes; Water use; Environmental Economics and Policy; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/118388
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SPATIAL, SEASONAL, AND TEMPORAL VARIATIONS IN RAINFALL AGGRESSIVENESS IN THE SOUTH OF BRAZIL REA
Back,Álvaro J.; Gonçalves,Fabiane N.; Fan,Fernando M..
ABSTRACT The objective of this study is to evaluate spatial and temporal variations in rainfall aggressiveness in southern Brazil. A total of 181 rain gauge stations located in southern Brazil with rainfall time series from 1976 to 2015 were used. Seasonal and annual rainfall aggressiveness values measured according to the Modified Fournier Index (MFI) were analyzed. The trends in the data series were evaluated using the Mann-Kendall test at a level of significance of 5%. Maps on spatial and seasonal variations in rainfall aggressiveness were prepared. The percentage of rain gauge stations with significant decreasing trends, significant increasing trends, and no significant trends in rainfall aggressiveness between years was 3.3%, 7.7%, and 89.0%,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Erosivity; Soil conservation; Precipitation; Climatic trends.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400466
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Erosive rainfall in Rio do Peixe Valley in Santa Catarina, Brazil: Part I - Determination of the erosivity index AGRIAMBI
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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Erosive rainfall in the Rio do Peixe Valley: Part III - Risk of extreme events AGRIAMBI
Back,Álvaro J.; Pola,Augusto C.; Ladwig,Nilzo I.; Schwalm,Hugo.
ABSTRACT Understanding the risks of extreme events related to soil erosion is important for adequate dimensioning of erosion and runoff control structures. The objective of this study was to determine the rainfall erosivity with different return periods for the Valley of the Rio do Peixe in Santa Catarina state, Brazil. Daily pluviographic data series from 1984 to 2014 from the Campos Novos, and Videira meteorological stations and from 1986 to 2014 from the Caçador station were used. The data series of maximum annual rainfall intensity in 30 min, maximum annual erosive rainfall, and total annual erosivity were analyzed for each station. The Gumbel-Chow distributions were adjusted and their adhesions were evaluated by the Kolmogorov-Smirnov test at a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil conservation; Water erosion; Precipitation; Probability.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100063
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Erosive rainfall in the Rio do Peixe Valley in Santa Catarina, Brazil: Part II - Characteristics and temporal distribution pattern AGRIAMBI
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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Manejo e conservação de solos para culturas alimentares nas condições tropicais umidas. Infoteca-e
BAENA, A. R. C..
bitstream/item/228210/1/Manejo-e-conservacao-de-solos-para.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Caupi; Conservacao de solo; Cultivo alimentar; Regiao tropical umida; Maize; Arroz; Feijão de Corda; Mandioca; Manejo do Solo; Milho; Cassava; Cowpeas; Food crops; Rice; Soil conservation; Soil management.
Ano: 1982 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381831
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Assessment of soil erosion in olive orchards (Olea europaea L.) under cover crops management systems in the tropical region of Brazil Rev. Bras. Ciênc. Solo
Beniaich,Adnane; Silva,Marx Leandro Naves; Guimarães,Danielle Vieira; Bispo,Diêgo Faustolo Alves; Avanzi,Junior Cesar; Curi,Nilton; Pio,Rafael; Dondeyne,Stefaan.
ABSTRACT In the tropics, water erosion is one of the most important factors leading to the degradation and deterioration of agricultural land. Olive orchards have a low canopy coverage, especially during the first years after planting, due to the low density of olive trees. Given the fast expansion of olive orchards in Brazil, this study aimed to evaluate the effect of cover vegetation on soil and water losses under natural rainfall. In addition, it was assessed the crop performance and the vegetation cover index in different management systems in olive orchards. The study was carried out in soil erosion plots, where water and sediment were sampled and measured over two crops season, under the following treatments: in the first season, bare soil with olive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil conservation; Soil loss; Land degradation; Runoff; Olive cultivation.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832020000100503
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Correção do solo, adubação e plantio. Infoteca-e
BERNARDI, A. C. de C.; MOREIRA, A.; FERREIRA, R. de P..
bitstream/item/220864/1/p-60-alfafa.pdf
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Conservação do Solo; Estrutura do Solo; Adubação; Plantio; Soil conservation; Soil conditioners; Soil structure.
Ano: 2020 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1129761
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Produtividade de feijão-guará e efeito supressivo de culturas de cobertura de inverno em espontâneas de verão - DOI: 10.4025/actasciagron.v31i4.988 Agronomy
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...
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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Water Erosion Prediction Using the Revised Universal Soil Loss Equation (RUSLE) in a GIS Framework, Central Chile Chilean J. Agric. Res.
Bonilla,Carlos A; Reyes,José L; Magri,Antoni.
Soil erosion is a growing problem in Central Chile, particularly in coastal dry lands, where it can significantly decrease the productivity of rainfed agriculture and forestry. In this study, the Revised Universal Soil Loss Equation (RUSLE) was integrated into a Geographic Information System (GIS), and used to evaluate the effects of different combinations of vegetative cover on soil erosion rates for Santo Domingo County in Central Chile. Implementing RUSLE in the GIS required a complete description of the county’s soils, climate, topography and current land use/land cover. This information was compiled in rasters of 25 x 25 m cells. RUSLE parameter values were assigned to each cell and annual soil loss estimates were generated on a cell by cell basis....
Tipo: Journal article Palavras-chave: RUSLE; Water erosion; Soil conservation; Forestry; Changes in land use/land cover; Central Chile.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100017
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Adoption of Soil Conservation Practices in Olive Groves: The Case of Spanish Mountainous Areas AgEcon
Calatrava-Leyva, Javier; Franco, Juan Agustin; Gonzalez-Roa, Maria del Carmen.
This paper presents some results from a survey carried out in 2004 among 223 olive tree farmers from mountainous areas in the Spanish Southern provinces of Granada and Jaen regarding the adoption of soil conservation and management practices. Olive tree groves in mountainous areas are subject to a high risk of soil erosion and have to incur in higher costs of soil conservation. This results in greater difficulties to comply with cross-compliance and to benefit from agri-environmental schemes. Our main objectives are to analyse the current level of adoption of soil conservation practices and to analyse which socio-economic and institutional factors determine such adoption. Three Probit models are estimated. Dependant variables are three different soil...
Tipo: Conference Paper or Presentation Palavras-chave: Olive groves; Soil conservation; Technology adoption; Resource /Energy Economics and Policy; Q12; Q24.
Ano: 2005 URL: http://purl.umn.edu/24661
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Emissões de NO, N2O e CO2 em agroecossistemas do Cerrado. Infoteca-e
CARVALHO, A. M. de; BUSTAMANTE, M. M. da C..
ABSTRACT: In the last 30 years, the Cerrado Biome has suffered very intense conversion of its native vegetation into croplands (Brazilian Savanna). This habitat modification has contributed with 25% and 90% of the total CO2 and N2O anthropogenic emission respectively. Soil preparation (tillage and no-tillage), deposition of crop residues, cultivation of N-fixing species and nitrogen fertilization are management practices that influence trace gas fluxes from soil to atmosphere. Nevertheless, the interaction between such practices and NO, N2O and CO2 fluxes in the Cerrado region is still unclear. Raining events after the dry season results in NO and CO2 pulses. The interaction between nitrogen application-during rain events affects NO and CO2 emissions. The...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Carbono; Conservação do Solo; Efeito Estufa; Gás; Matéria Orgânica.; Manejo do Solo; Gases; Carbon; Greenhouse effect; Organic matter; Soil conservation; Soil management..
Ano: 2007 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572290
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Rainfall erosivity for the State of Rio de Janeiro estimated by artificial neural network REA
Carvalho,Daniel F. de; Khoury Júnior,Joseph K.; Varella,Carlos A. A.; Giori,Jacqueline Z.; Machado,Roriz L..
The Artificial Neural Networks (ANNs) are mathematical models method capable of estimating non-linear response plans. The advantage of these models is to present different responses of the statistical models. Thus, the objective of this study was to develop and to test ANNs for estimating rainfall erosivity index (EI30) as a function of the geographical location for the state of Rio de Janeiro, Brazil and generating a thematic visualization map. The characteristics of latitude, longitude e altitude using ANNs were acceptable to estimating EI30 and allowing visualization of the space variability of EI30. Thus, ANN is a potential option for the estimate of climatic variables in substitution to the traditional methods of interpolation.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geographic information system; Interpolation methods; Soil conservation.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100020
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Assessing rainfall erosivity indices through synthetic precipitation series and artificial neural networks Anais da ABC (AABC)
CECíLIO,ROBERTO A.; MOREIRA,MICHEL C.; PEZZOPANE,JOSé EDUARDO M.; PRUSKI,FERNANDO F.; FUKUNAGA,DANILO C..
The rainfall parameter that expresses the capacity to promote soil erosion is called rainfall erosivity (R), and is commonly represented by the indexes EI30 and KE>25. The calculations of these indexes requires pluviographical records, that are difficult to obtain in Brazil. This paper describes the use of synthetic rainfall series to compute EI30 and KE>25 in Espírito Santo State (Brazil). Artificial neural networks (ANNs) were also developed to spatially interpolate R values in Espírito Santo. EI30 and KE>25 indexes values were close to those calculated on a homogeneous area according to the similarity of rainfall distribution; indicating the applicability of the use of synthetic rainfall series to estimate the R factor. ANNs had a better...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Interpolation; Rainfall generator; Soil conservation; Universal soil loss equation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401523
Registros recuperados: 81
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