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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
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A comparative study of techniques for modeling the spatiotemporal distribution of heat and moisture fluxes at different agroecosystems in Brazil. Repositório Alice
TEIXEIRA, A. H. de C.; HERNANDEZ, F. B. T.; LOPES, H. L.; SCHERER-WARREN, M; BASSOI, L. H..
As a result, this chapter is structured as follows: following the introduction, the study region, datasets, and the steps for modeling are described; one of the first comparisons between SAFER and SEBAL is then made available, comparing estimates by these two modeling approaches against corresponding estimates by the traditional FAO methodology; next, results from case studies are furnished, covering application of both SAFER and SEBAL methods with satellite images, in some irrigation crops and natural vegetation at different spatial and temporal scales in the Brazilian semiarid region.
Tipo: Capítulo em livro científico (ALICE) Palavras-chave: Agroecossistema; Floxo de calor; Umidade do solo; Balanço de energia; Recurso natural; Sensoriamento remoto; Energy budget; Remote sensing; Soil moisture.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/972949
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Assessment of Influence and Inter-Relationships of Soil Properties in Tropical Grasslands of Central India CIGR Journal
goroshi, sheshakumar k.
The present experiment was carried out to assess influence and inter-relationships of soil properties in grasslands of three wildlife protected national parks in Central India. Aboveground biomass samples of grass and soil samples were collected during different seasons based on specified measurement protocol by the state forest department. Aboveground biomass of grass demonstrated a characteristic growth pattern throughout the year, increased and achieved maximum biomass during at the end of rainy season (September), while started decreasing and attained minimum biomass during pre-summer (March) season. Mean aboveground biomass in the study regions was varied from 2.03 (Bandhavgadh National Park) to 5.44 Mg ha-1 (Kanha National Park) with an average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grassland; Aboveground biomass; Soil moisture; Soil properties; Central India.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2535
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Avaliação do manejo de águas no perímetro irrigado de Bebedouro, Petrolina, PE. Infoteca-e
VALDIVIESO SALAZAR, C. R.; CORDEIRO, G. G..
O uso pouco racional da agua de irrigacao (condicoes de mau manejo de agua) tem originado a formacao de lencol freatico que se aproxima da superficie do solo em lugares e epocas determinadas, criando condicoes improprias ou desvangajosas para o desenvolvimento das culturas e limitando a sua produtividade. O presente trabalho refere-se a quantificacao de uso de agua no Perimetro Irrigado de Bebedouro, em Petrolina,PE, avaliando as eficiencias de irrigacao nos diferentes niveis de conducao, distribuicao e aplicacao e que permitem determinar a grandeza da quantidade de agua perdida que contribui para o problema de drenagem. Dessa forma sao conferidas frequencias de irrigacao inadequadas que mantem um regime de umidade tambem inadequado na zona radicular, em...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Manejo; Água; Eficiência; Balanço hidrico; Solo; Umidade; Brasil; Pernambuco; Petrolina; Projeto Bebedouro; Efficiency; Water management; Frequency; Soil moisture; Water balance; Irrigação; Irrigation.
Ano: 1985 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/133649
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Beans cultivation and water regime on soil physical attributes CIGR Journal
Domingues, Rafael; Pereira, André Belmont; Pires, Luiz Fernando; Schiebelbein, Luis Miguel; Barbosa, Eduardo Augusto Agnellos; Auler, André Carlos.
Beans crop is an agricultural staple largely consumed in Brazil because it is part of the basic food of the population. Such a crop is usually grown by small growers and turns out to be of a great social and economical importance. The aim of the current manuscript was to scrutinize the effect of soil water status on its physical attributes, such as bulk density, total porosity, macroporosity, microporosity, hydraulic conductivity under protected environment conditions on beans crop (Phaseolus vulgaris L.). The effect of the soil physical attributes on the biological response of the plants was also investigated. The experiment was installed in March of 2016 in a greenhouse. The experimental design was completely randomized in a factorial scheme with four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agronomy; Agrometeorology; Soil Physics; Irrigation Science Phaseolus vulgaris L; Hydraulic conductivity; Soil moisture; Macroporosity; Microporosity; Bulk density.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4585
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Biomassa microbiana em amostras de solos secadas ao ar e reumedecidas. Repositório Alice
GONÇALVES, A. S.; MONTEIRO, M. T.; GUERRA, J. G. M.; DE-POLLI, H..
O objetivo do trabalho foi avaliar a viabilidade do condicionamento de amostras como terra fina secada ao ar (TFSA) por curto período, para a determinação do carbono da biomassa microbiana (BMS-C), pelo método da fumigação-extração, e verificar a respiração microbiana basal (RB) do solo. O condicionamento como TFSA, procedendo-se à fumigação para a análise da BMS-C imediatamente ou 24 horas após o reumedecimento, proporcionou valores de BMS-C para os solos Podzólicos, Latossolo Vermelho-Amarelo álico e Orgânico, semelhantes aos valores dos seus controles. Os solos Glei Pouco Húmico e Vertissolo apresentaram valores de BMS-C similares aos do controle a partir de 24 horas de incubação; o solo Planossolo arenoso apresentou valores similares aos do controle...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carbono; Fumigação do solo; Umidade do solo; Carbon; Soil fumigation; Soil moisture.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/107315
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Cap-hardening parameters of Cam-clay model variations with soil moisture content and shape-restricted regression model CIGR Journal
Mehari Zewde Tekeste; Deere&Co; Desale H Habtzghi; Department of Statistics, The University of Akron, Akron, OH; Jos Koolen; Wagenigen University.
Modeling of soil elastic and permanent plastic volumetric strains (compaction) caused by loading from machinery vehicles using the modified Cam-clay soil constitutive model requires understanding the behaviors of compression and rebound parameters under unsaturated soil conditions.  Oedometer tests were conducted on a sandy loam, a loam, and a clay loam soil, all tropical soils, at three initial soil moisture contents and five maximum stress levels (50, 100, 200, 300 and 400 kPa).  The objectives were to investigate the effects of soil moisture content and maximum applied stress on the modified compression index (l*) and modified rebound index (k*) parameters of a modified Cam-clay soil model on the three soils and predict the compressibility indices using...
Palavras-chave: Modified compression index (l*); Modified rebound index (k*); Axial stress; Uniaxial compression cyclic test; Soil moisture; Soil types.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2214
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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
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Contribution of water content and bulk density to field soil penetration resistance as measured by a combined cone penetrometer - TDR probe. Repositório Alice
VAZ, C. M. P.; BASSOI, L. H.; HOPMANS, J. W..
Soil strength as measured by cone penetrometers depends on several parameters, but it is mostly affected by the soil water content and bulk density (p). In order to better understand the effect of the water content and bulk density on soil strength we developed a combined penetronieter-coiled TDR probe to determine simultaneously the depth distribution of penetration resistance and water content in a soil profile. Field experiments carried out for a Yolo soil allowed the fitting of the effect and p using a combined power-exponential equation. Using the combined cone penetrometer-TDR probe data, the fitted equation may be used to estimate soil bulk density.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Compactacao; Densidade; Penetracao; Soil moisture; Compaction; Penetration; Resistance; Água; Resistência; Umidade do Solo; Density; Water.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134462
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Dielectric constant obtained from TDR and volumetric moisture of soils in southern Brazil Rev. Bras. Ciênc. Solo
Kaiser,Douglas Rodrigo; Reinert,Dalvan José; Reichert,José Miguel; Minella,Jean Paollo Gomes.
Soil moisture is the property which most greatly influences the soil dielectric constant, which is also influenced by soil mineralogy. The aim of this study was to determine mathematical models for soil moisture and the dielectric constant (Ka) for a Hapludalf, two clayey Hapludox and a very clayey Hapludox and test the reliability of universal models, such as those proposed by Topp and Ledieu and their co-workers in the 80's, and specific models to estimate soil moisture with a TDR. Soil samples were collected from the 0 to 0.30 m layer, sieved through a mesh of 0.002 m diameter and packed in PVC cylinders with a 0.1 m diameter and 0.3 m height. Seven samples of each soil class were saturated by capillarity and a probe composed of two rods was inserted in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical models; Soil moisture; TDR; Calibration.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300006
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Efeito da variacao diaria da umidade do solo sobre a fotossintese e resistencia estomatica da soja. Repositório Alice
FARIAS, J.R.B.; NEUMAIER, N.; NEPOMUCENO, A.L..
O presente trabalho objetivou caracterizar o comportamento ao longo do dia da taxa fotossintetica e da resistencia estomatica de cultivares de soja submetidas a diferentes condicoes de disponibilidade hidrica do solo. Para tanto, plantas da cultivar Bragg foram submetidas a dois niveis (25% e 35%) de umidade gravimetrica do solo (Ug) apos o inicio da floracao. O experimento foi conduzido em casa de vegetacao em vasos de aproximadamente 15 litros. As avaliacoes de taxa fotossintetica (TF) e de resistencia estomatica (RE), foram feitas no foliolo central de folhas completamente expandidas, situadas no terco superior da planta, ao longo do dia, irrigando-se ou nao os vasos apos cada leitura. Observou-se uma estreita relacao da TF e RE com a umidade do solo e...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Soja; Resistencia estomatica; Umidade do solo; Variacao; Brasil; Parana; Soybean stomatal resistance; Variation; Soil moisture; Brazil.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/456045
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Efeito do conteúdo de água e da compactação do solo na produção de soja. Repositório Alice
BEUTLER, A.N.; CENTURION, J.F..
A compactação do solo tem sido fator físico limitante ao crescimento das plantas. Este trabalho objetivou avaliar a produção de soja (Glycine max cv. EMBRAPA 48) em razão do conteúdo de água e da compactação do solo. Usou-se o delineamento inteiramente casualizado, em esquema fatorial 4x2, ou seja, quatro níveis de resistência à penetração (entre 0,27 e 4,32 MPa) e dois níveis de retenção de água pelo solo (0,05 e 0,01 MPa). Foram utilizadas amostras de Latossolo Vermelho textura média (LVd) e Latossolo Vermelho textura argilosa (LVef), coletadas na profundidade de 0-20 cm, passadas em peneira de 0,4 cm e compactadas em camadas de 3 cm, em vasos de 20 cm de altura e 25 cm de diâmetro (9,82 L). Os níveis de resistência à penetração foram determinados com o...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Resistência do solo; Umidade do solo; Densidade do solo; Manejo do solo; Soil strength; Soil moisture; Soil density; Soil management.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/109125
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Efeito do deficit hidrico no solo sobre o comportamento estomatico e potencial da agua em mudas de seringueira. Repositório Alice
BRUNINI, O.; CARDOSO, M..
O objetivo deste trabalho foi avaliar o efeito do estresse hidrico sobre o potencial da agua na folha da seringueira, a resistencia estomatica, e a recuperacao do potencial de agua na folha. Progenies de polinizacao aberta de seringueira (Hevea spp.), provenientes dos clones IAN 873, RRIM 600, IAN 713 e de pes francos de Hbr, foram cultivadas sob condicoes controladas e submetidas a deficits hidricos crescentes no solo pela suspensao da irrigacao. Sob alta disponibilidade de agua no solo, a resistencia estomatica dos clones IAN 713 e IAN 873 era similar, porem inferior a dos demais. A baixos valores de disponibilidade hidrica no solo, a resistencia estomatica aumentou consideravelmente em todas progenies, e houve uma inversao de posicao entre o IAN 713 e o...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Ajuste osmotico; Teor de agua no solo; Estresse hidrico do solo; Potencial de agua nas folhas; Resistencia estomatica; Umidade de solo; Osmotic adjustment; Soil water content; Soil water deficit; Plant water potencial; Stomatal resistance; Soil moisture.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89520
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Effects of vinasse application under the physical attributes of soil covered with sugarcane straw REA
Costa,Cicero da S.; Pedrosa,Elvira M. R.; Rolim,Mario M.; Santos,Hugo R. B.; Cordeiro Neto,Aluízio T..
Areas under vinasse application have been associated to favorable physical conditions for root development, aeration, infiltration and water movement in soil profile. This study aimed to evaluate changes on physical attributes of soil under sugarcane straw after vinasse application in two sugarcane growing areas (Area 1 and Area 2) under mechanized management in the state of Paraíba, Brazil. In each area, the samples were collected in the 0-0.20, 0.20-0.40 and 0.40-0.60m layers of the soil, in 36 points, distributed in a 10×10m mesh, one day before and 40 days after vinasse application. The data were submitted to multivariate analysis with repeated measures and geostatistics. The vinasse application decreased soil density and increased total porosity in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Residue use; Saccharum; Geostatistics; Soil moisture; Soil density.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400005
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Estimativa da evapotranspiracao da mangueira com base no balanco hidrico do solo. Repositório Alice
SILVA, V de P. R. da; AZEVEDO, P. V. de; SILVA, B. B. da; BASSOI, L. H.; TEIXEIRA, A. H. de C.; SOARES, J. M.; SILVA, J. A. M. e..
No Projeto Irrigado de Bebedouro, em Petrolina, PE (latitude: 09o09`S, longitude: 40o22`W, altitude: 365,5 m) foram avaliados, nos anos de 1998 e 1999, a distribuicao radicular e o consumo de agua da mangueira, cv. Tommy Atkins, com sete anos de idade, cultivada em espacamento de 5 x 8 m e irrigada por gotejamento. A profundidade efetiva das raizes foi de 1,80 m e o consumo medio de agua foi de 4,6 e 4,1 mm d-1em 1998 e 1999, respectivamente. Os resultados indicaram que o metodo do balanco hidrico do solo fornece estimativa da evapotranspiracao real da mangueira, para periodo de sete dias com erro de 8%, que diminui a medida em que se aumenta o periodo analisado.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Root; Soil moisture; Balanço Hídrico; Manga; Mangifera Indica; Raiz; Umidade do Solo; Mangoes; Water balance.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134492
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Evaluation of DSSAT soil-water balance module under cropped and bare soil conditions BABT
Faria,Rogério Teixeira de; Bowen,Walter Truman.
The performance of the soil water balance module (SWBM) in the models of DSSAT v3.5 was evaluated against soil moisture data measured in bare soil and dry bean plots, in Paraná, southern Brazil. Under bare soil, the SWBM showed a low performance to simulate soil moisture profiles due to inadequacies of the method used to calculate unsaturated soil water flux. Improved estimates were achieved by modifying the SWBM with the use of Darcy's equation to simulate soil water flux as a function of soil water potential gradient between consecutive soil layers. When used to simulate water balance for the bean crop, the modified SWBM improved soil moisture estimation but underpredicted crop yield. Root water uptake data indicated that assumptions on the original...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil moisture; Dry Bean; Modeling.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400001
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Hydro-physical processes and soil properties correlated with origin of soil hydrophobicity Ciência Rural
Vogelmann,Eduardo Saldanha; Reichert,José Miguel; Prevedello,Juliana; Awe,Gabriel Oladele.
Hydrophobicity is the phenomenon where the soil has reduced wettability, usually associated with coating of soil particles by hydrophobic organic substances. This study aimed to provide a description of the hydrophobicity occurrence, highlight recent discoveries about the origin of phenomenon and discuss the main hydro-physical properties and chemical processes linked to the development of hydrophobic behavior in soils. Hydrophobicity is associated with other factors such as soil moisture, presence of some fungi species, particle size, soil pH and occurrence of burnings. The causative substances may be provided by local vegetation, through deposition or decomposition. The dependence and combination of different factors that influence hydrophobicity in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrophobic; Hydrophilic; Organic matter; Water repellency; Soil moisture.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000900008
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Inventory of water storage types in the Blue Nile and Volta River Basins AgEcon
Johnston, Robyn M.; McCartney, Matthew P..
For agriculture there is a continuum of water storage options, ranging from groundwater aquifers, soil water, natural wetlands and small ponds and tanks to large reservoirs. In any situation each of these has its own niche in terms of technical feasibility, socioeconomic sustainability and impact on public health and the environment. Planning storage requires insight into impending needs and also a good understanding of what already exists and what was, and was not, successful, in the past. This report provides an inventory of existing and prospective water storage in the Ghanaian Volta and the Ethiopian Blue Nile basins. It provides as much quantitative data as possible, but highlights both the dearth of readily available information and the lack of...
Tipo: Working or Discussion Paper Palavras-chave: Water storage; River basins; Reservoirs; Ponds; Tanks; Groundwater; Soil moisture; Wetlands; Environmental Economics and Policy; Farm Management.
Ano: 2010 URL: http://purl.umn.edu/113608
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Kinetic parameters of soil β-glucosidase response to environmental temperature and moisture regimes Rev. Bras. Ciênc. Solo
Zhang,Yulan; Chen,Lijun; Wu,Zhijie; Sun,Caixia.
Soil β-glucosidase participates in the final step of cellulose biodegradation. It is significant in the soil C cycle and is used as an indicator of the biological fertility of soil. However, the response of its kinetic parameters to environmental temperature and moisture regimes is not well understood. This study tested the β-glucosidase response in the main agricultural soils (black soil, albic soil, brown soil, and cinnamon soil) of Northeast China. Incubation tests were conducted to measure the kinetic parameters Km, Vmax or Vmax/Km of soil β-glucosidase at environmental temperatures of 10, 20 and 30 ºC and at 10, 20 and 30 % soil moisture content. The insensitive response of the kinetic parameters to temperature changes indicates that soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Enzymatic kinetic; Soil moisture; Cellulose biodegradation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400022
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Manejo da agua do solo no cultivo da batata. Infoteca-e
OLIVEIRA, C. A. da S.; VALADAO, L.T..
1997
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Batata; Umidade; Manejo de agua; Solo; Irrigacao; Solanum tuberosum; Potatoes; Soil moisture; Soil water content; Irrigation.
Ano: 1997 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/758610
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