Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 26
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
24-h variation in soil respiration after a long dry season in a Sudano-Sahelian region Scientia Agricola
Yemadje,Pierrot Lionel; Guibert,Hervé; Blavet,Didier; Olina,Jean-Paul; Chevallier,Tiphaine; Deleporte,Philippe; Bernoux,Martial.
Soil respiration is a major component of the global carbon cycle which links ecosystems and the atmosphere. To evaluate the reaction of soil respiration after wetting, during a dry period, soil respiration and associated environmental factors were measured over a 24-h period, during the dry season in North Cameroon after wetting the soil. Over 24-h, soil respiration rates followed a quadratic curve during the day coming close to linear at night, while soil temperature and moisture together explained at least 73 % of the variations during the 24-h observed. These soil respiration rates increased during the morning, peaked between 11h00 and 13h00 and then decreased gradually to the minimum around 06h00. These observations were used to propose a method for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diel soil respiration; Soil temperature; Soil moisture.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500452
Imagem não selecionada

Imprime registro no formato completo
Adaptability of lettuce cultivars to planting in no-tillage on straw of Urochloa ruziziensis PAB
Hirata,Andréia Cristina Silva; Hirata,Edson Kiyoharu; Camara,João Augusto Rizzo.
Abstract: The objective of this work was to evaluate the adaptability of different lettuce (Lactuca sativa) cultivars grown in no-tillage on straw of ruzi grass (Urochloa ruziziensis), as well as its effects on soil temperature and weed control, in successive cultivations in the summer. The treatments were carried out in a randomized complete block design, with four replicates, in a split-plot arrangement (2x4), in which soil management (no-tillage on ruzi grass and convention tillage) was the main plot, and the different crisphead lettuce cultivars (Amanda, Solaris, Vanda, and Vera), the subplots. No difference was observed between cultivars for soil management. No-tillage reduced the soil temperature by up to 3.7°C and weed density by 3.7 times, in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria; Lactuca sativa; Soil conservation; Soil temperature; Vegetable crops; Weeds.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700824
Imagem não selecionada

Imprime registro no formato completo
APPRAISAL OF THE SNAP MODEL FOR PREDICTING NITROGEN MINERALIZATION IN TROPICAL SOILS UNDER EUCALYPTUS Rev. Bras. Ciênc. Solo
Smethurst,Philip James; Gonçalves,José Leonardo de Moraes; Pulito,Ana Paula; Gomes,Simone; Paul,Keryn; Alvares,Clayton Alcarde; Arthur Júnior,José Carlos.
The Soil Nitrogen Availability Predictor (SNAP) model predicts daily and annual rates of net N mineralization (NNM) based on daily weather measurements, daily predictions of soil water and soil temperature, and on temperature and moisture modifiers obtained during aerobic incubation (basal rate). The model was based on in situ measurements of NNM in Australian soils under temperate climate. The purpose of this study was to assess this model for use in tropical soils under eucalyptus plantations in São Paulo State, Brazil. Based on field incubations for one month in three, NNM rates were measured at 11 sites (0-20 cm layer) for 21 months. The basal rate was determined in in situ incubations during moist and warm periods (January to March). Annual rates of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest soil; Soil temperature; Process-based model.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200523
Imagem não selecionada

Imprime registro no formato completo
Aspectos térmicos do solo em sistemas rotacionais de agricultura no nordeste do Pará. Repositório Alice
ARAUJO, A. C. de; COIMBRA, H. M.; MOLLER, M. R. F.; SÁ, T. D. de A..
bitstream/item/199148/1/Aspectos-termicos-do-solo.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Região Nordeste; Pará; Brasil; Rotational cropping; Rotação de Cultura; Temperatura do Solo; Amazonia; Soil temperature.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/399834
Imagem não selecionada

Imprime registro no formato completo
Avaliação do comportamento térmico mensal do solo na cidade de Belém-Pa. Repositório Alice
DIAS, J. L.; PACHECO, N. A.; SILVA JUNIOR, J. de A..
Este trabalho tem como objetivo analisar o comportamento mensal da temperatura do solo na estação meteorológica da Embrapa Amazônia Oriental, em Belém e suas variações térmicas nas diferentes camadas superficiais em uma época chuvosa e menos chuvosa da região
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Temperatura do solo; Comportamento térmico; Amazônia; Soil temperature; Thermal performance; Amazon.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003106
Imagem não selecionada

Imprime registro no formato completo
Carbon dioxide efflux in a rhodic hapludox as affected by tillage systems in southern Brazil Rev. Bras. Ciênc. Solo
Chavez,Luis Fernando; Amado,Telmo Jorge Carneiro; Bayer,Cimélio; La Scala,Newton Junior; Escobar,Luisa Fernanda; Fiorin,Jackson Ernani; Campos,Ben-Hur Costa de.
Agricultural soils can act as a source or sink of atmospheric C, according to the soil management. This long-term experiment (22 years) was evaluated during 30 days in autumn, to quantify the effect of tillage systems (conventional tillage-CT and no-till-NT) on the soil CO2-C flux in a Rhodic Hapludox in Rio Grande do Sul State, Southern Brazil. A closed-dynamic system (Flux Chamber 6400-09, Licor) and a static system (alkali absorption) were used to measure soil CO2-C flux immediately after soybean harvest. Soil temperature and soil moisture were measured simultaneously with CO2-C flux, by Licor-6400 soil temperature probe and manual TDR, respectively. During the entire month, a CO2-C emission of less than 30 % of the C input through soybean crop residues...
Tipo: Info:eu-repo/semantics/article Palavras-chave: No-till; Greenhouse gases; Soil temperature; Soil moisture.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200010
Imagem não selecionada

Imprime registro no formato completo
Classification of soil respiration in areas of sugarcane renewal using decision tree. Repositório Alice
FARHATE, C. V. V.; SOUZA, Z. M. de; OLIVEIRA, S. R. de M.; CARVALHO, J. L. N.; LA SCALA JÚNIOR, N.; SANTOS, A. P. G..
ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Mineração de dados; Emissão de gás carbônico no solo; Seleção de variável; Temperatura no solo; Matéria orgânica no solo; Árvore de decisão; Data mining; Variable selection; Decision tree; Respiração do Solo; Carbon dioxide; Soil temperature; Soil organic matter.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1105884
Imagem não selecionada

Imprime registro no formato completo
Classification of soil respiration in areas of sugarcane renewal using decision tree Scientia Agricola
Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Oliveira,Stanley Robson de Medeiros; Carvalho,João Luís Nunes; Scala Júnior,Newton La; Santos,Ana Paula Guimarães.
ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil CO2 emission; Data mining; Variable selection; Soil temperature; Soil organic matter.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300216
Imagem não selecionada

Imprime registro no formato completo
Determinacao da tensao de agua em solo agricola usando um sensor de dissipacao de calor. Repositório Alice
OLIVEIRA, C.A. da S..
Um estudo foi realizado sob condicoes de laboratorio e de campo objetivando avaliar um sensor de solo utilizado para determinacao da temperatura e da tensao da agua no solo. Devido a solubilidade do gesso, material poroso utilizado na fabricacao dos sensores, houve reducao em area da secao transversal e volume, e aumento da porosidade efetiva desses sensores, em relacao aos valores observados antes do inicio dos testes. Os valores medios da temperatura observados com os sensores foram praticamente iguais aos observados com um termometro de referencia com precisao de 0,1 Graus C. Quando sensores saturados foram instalados a 5 cm de profundidade em um solo franco-argilo-siltoso secado ao ar, em relacao a valores de Delta T, o tempo de resposta do sensor a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Umidade do solo; Potencial matricial; Temperatura do solo; Soil water content; Matric potential; Soil temperature.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/100716
Imagem não selecionada

Imprime registro no formato completo
Effect of polyethylene mulches on soil temperature and tomato yield in plastic greenhouse Scientia Agricola
Streck,N.A.; Schneider,F.M.; Buriol,G.A.; Heldwein,A.B..
The effect of soil mulching with transparent, black, white, and co-extruded white-on-black polyethylene sheets on soil temperature and tomato yield was evaluated in the Subtropical Central Region of the Rio Grande do Sul State, Brazil. The experiment was carried out from August 21, 1994 to December 2, 1994 in a 10m x 25m nonheated plastic greenhouse located at the county of Santa Maria. Highest soil temperatures were obtained under transparent mulch. Maximum amplitude of soil temperature waves was smaller under opaque mulches. Tomato yield was not significantly affected by mulch treatments, however, a tendency of greater yield was observed for opaque mulches as compared to transparent mulch. Among opaque mulches, the highest yield was obtained from white...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mulching; Soil temperature; Tomato; Plastic greehouse.
Ano: 1995 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300028
Imagem não selecionada

Imprime registro no formato completo
EFFECT OF SOIL SOLARIZATION ON THERMAL REGIME OF PLASTIC GREENHOUSE SOIL Ciência Rural
Streck,Nereu Augusto; Schneider,Flavio Miguel; Buriol,Galileo Adeli.
SUMMARY Temperature modification in soil of plastic greenhouse caused by solarization was measured during the summer in the Subtropical Central Region of the Rio Grande do Sul State, Brazil. The experiment was carried out in a 10m x 25m greenhouse covered with low density transparent polyethylene (PE). Four 6m x 4m plots were mulched with 100µm thickness PE sheets, from December 12, 1992 to March 7, 1993. Four other plots (same size) without the cover were used as control (bare soil). Results indicated that solarization incrased the maximum soil temperature. The average was 11.9, 10.8, 9.8, and 8.6°C over uncovered control soil at 2, 5, 10, and 20cm depth, respectively. The soil temperature reached values of up to 54.4°C at 2cm and 50.2°C at 5cm depth....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil solarization; Soil temperature; Mulching; Plastic greenhouse.
Ano: 1994 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781994000200001
Imagem não selecionada

Imprime registro no formato completo
Effects of pH, redox condition, and temperature on silica sorption in Philippine and Korean rice soils International Rice Research Institute
Lee, Sang-Eun.
136 leaves : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Rice soils; Soil pH; Redox reactions; Soil temperature; Silica; Sorption; Soil chemistry; Philippines; Korea Republic.
Ano: 1991 URL: http://hdl.handle.net/123456789/943
Imagem não selecionada

Imprime registro no formato completo
Flutuação populacional de Rotylenchulus reniformis em solo cultivado com algodoeiro. Repositório Alice
ASMUS, G.L.; ISHIMI, C.M..
O objetivo deste trabalho foi caracterizar a flutuação populacional de nematoide reniforme (Rotylenchulus reniformis) em solo cultivado com algodoeiro, em função de variáveis edafoclimáticas. Em uma área naturalmente infestada com média de 680 nematoides por 200 cm3 de solo, em Aral Moreira, MS foi estabelecida uma grade de amostragem com 30 pontos, equidistantes em 50 m. No período de outubro de 2004 a junho de 2006, amostras de solo (0,0?0,2 m e 0,2?0,4 m) foram coletadas mensalmente, para avaliação da abundância e composição dos diferentes estágios da população do nematoide. Foram também mensuradas a precipitação, a temperatura e a umidade do solo a 0,15 e 0,30 m. Foi possível observar que a densidade e a composição populacional de R. reniformis são...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Gossypium hirsutum; Anidrobiose; Nematoide reniforme; Temperatura do solo; Umidade do solo; Anhydrobiosis; Reniform nematode; Soil temperature; Soil humidity.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/125743
Imagem não selecionada

Imprime registro no formato completo
Influence of double cropping on growth and yield of dry beans with colored plastic mulches Chilean J. Agric. Res.
Ibarra-Jiménez,Luis; Valdez-Aguilar,Luis Alonso; Cárdenas-Flores,Antonio; Lira-Saldivar,Hugo; Lozano-del Río,Javier; Lozano Cavazos,Carlos.
There are numerous studies of the use of plastic mulches in vegetable production, but there is little documentation of their use with dry beans (Phaseolus vulgaris L.) in single and double cropping. The objective of this study was to grow dry beans over two consecutive growing seasons using the same plastic mulch of different colors and examine the influence of soil temperature on growth and yield. The experiment was conducted in Saltillo, Coahuila, Mexico, in the spring and summer of 2008. The treatments included four colored plastic mulches: white-on-black, black, silver-on-black, aluminum-on-black, and bare soil as a control. The experimental design was a randomized complete block with four replicates. The percentage of photosynthetically active...
Tipo: Journal article Palavras-chave: Phaseolus vulgaris; Soil temperature; Photosynthesis; PAR; Plasticulture.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400002
Imagem não selecionada

Imprime registro no formato completo
Influence of litter layer removal on the soil thermal regime of a pine forest in a mediterranean climate Rev. Bras. Ciênc. Solo
Andrade,José Alexandre Varanda; Abreu,Francisco Manuel Gonçalves de; Madeira,Manuel Armando Valeriano.
The removal of the litter layer in Portuguese pine forests would reduce fire hazard, but on the other hand this practice would influence the thermal regime of the soil, hence affecting soil biological activity, litter decomposition and nutrient dynamics. Temperature profiles of a sandy soil (Haplic Podzol) under a pine forest were measured with thermocouples at depths to 16 cm, with and without litter layer. The litter layer acted as a thermal insulator, reducing the amplitude of the periodic temperature variation in the mineral soil underneath and increasing damping depths, particularly at low soil water contents. At the mineral soil surface the reduction of amplitudes was about 2.5 ºC in the annual cycle and 5 to 6.7 ºC in the daily cycle, depending on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil temperature; Fourier series; Damping depth.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500001
Imagem não selecionada

Imprime registro no formato completo
Influence of pine forest removal on flatwood soil temperature and moisture conditions. Repositório Alice
BASTOS, T. X.; SMITH, W. H..
1979
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Solo; Temperatura; Umidade; Pinheiro; Pinus palustris; Pinus elliottii; Floresta; Soil temperature; Moisture; Pine; Forest.
Ano: 1979 URL: http://www.alice.cnptia.embrapa.br/handle/doc/399928
Imagem não selecionada

Imprime registro no formato completo
Influence of woody species on aerial growth of perennial grasses in semi-arid rangelands of central Argentina Phyton
Blazquez,FR; Peláez,DV; Andrioli,RJ; Elia,OR.
The interaction between woody and grass species in semi-arid rangelands of central Argentina was assessed through the evaluation of the impact of woody species on grass growth over a 2-y period. The study comprised two morpho-physiologically different woody species and two cool-season perennial grass species highly preferred by domestic livestock. The study involved the assessment of total green length (TGL) and number of green leaves (NGL) per tiller in grasses growing beneath the canopy of woody species and in open rangeland areas. Soil temperature, pH and water, nitrogen, phosphorus and organic matter content were estimated at the same study sites. Precipitation during the study period was also recorded. Woody species induced higher TGL of grasses...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy architecture; Soil temperature; Soil water content; Tiller green length.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200023
Imagem não selecionada

Imprime registro no formato completo
Production of iceberg lettuce using mulches Scientia Agricola
Verdial,Marcelo Fontanetti; Lima,Márcio Santos de; Morgor,Átila F.; Goto,Rumy.
Mulches bring several benefits to lettuce cultivation. This work evaluated the effect of mulches on the cultivation of iceberg lettuce, cv. Lucy Brown. The treatment plots were: 1- no mulch and no weed control (control); 2- no mulch and weed control every 15 days; 3- sugarcane bagasse mulch of 2 cm thickness; 4- black plastic mulch; 5- double-faced plastic mulch (silver/black). Data were collected in regard to plant cycle when in the field, amount of chlorophyll in the leaves, productivity (individual weight per head) and amount of nutrients absorbed by the leaves. Double-faced plastic mulch provides the highest productivity and the highest values for the amount of chlorophyll, nitrogen, phosphorus, sulfur, boron and iron accumulation in the leaves.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactuca sativa; Mulching; Soil temperature; Nutrient.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400014
Imagem não selecionada

Imprime registro no formato completo
Seasonal pattern of root growth in relation to shoot phenology and soil temperature in sweet cherry trees (Prunus avium): A preliminary study in central Chile Ciencia e Investigación Agraria
Bonomelli,Claudia; Bonilla,Carlos; Acuña,Edouard; Artacho,Pamela.
The period between flowering and harvest in the sweet cherry (Prunus avium L.) is shorter than most fruit trees; thus, competition for assimilate and nutrients occurs early in the season. To properly supply water and nutrients during this critical period, optimal growth and root development are necessary. To characterize the root growth pattern of cherry trees in relation to shoot growth and phenology, a study was conducted on a 'Bing' cherry orchard on Gisela 6 rootstock at fourth leaf, located in central Chile (34°70' S, 70°43' W). During the 2009-2010 season, the shoot length and fruit diameter were measured on eight trees, and the root length was quantified by installing rhizotrons on two trees. Additionally, a two-tone (black/white) plastic cover was...
Tipo: Journal article Palavras-chave: Accumulated degree days; Root growth; Root length; Soil temperature; Sweet cherry.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100010
Imagem não selecionada

Imprime registro no formato completo
Soil CO2 efflux in central Amazonia: environmental and methodological effects Acta Amazonica
Zanchi,Fabrício B.; Waterloo,Maarten J.; Kruijt,Bart; Kesselmeier,Jürgen; Luizão,Flávio J.; Manzi,Antônio O.; Dolman,Albertus J..
Soil respiration plays a significant role in the carbon cycle of Amazonian rainforests. Measurements of soil respiration have only been carried out in few places in the Amazon. This study investigated the effects of the method of ring insertion in the soil as well as of rainfall and spatial distribution on CO2 emission in the central Amazon region. The ring insertion effect increased the soil emission about 13-20% for sandy and loamy soils during the firsts 4-7 hours, respectively. After rainfall events below 2 mm, the soil respiration did not change, but for rainfall greater than 3 mm, after 2 hours there was a decrease in soil temperature and respiration of about 10-34% for the loamy and sand soils, with emissions returning to normal after around 15-18...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil respiration; Rainfall; Soil temperature.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000200001
Registros recuperados: 26
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional