Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 30
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
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
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
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
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Microclimate of Atlantic forest fragments: regional and local scale heterogeneity BABT
Ramos,Flavio Nunes; Santos,Flavio Antonio Maës.
The aim of this work was to investigate whether (i) the organisms within different fragments, on regional scale (separated by up to 100 km), could be submitted to similar climatic conditions (rainfall and temperature), and whether (ii) the edge formation in forest fragments could stimulate microclimatic changes (canopy cover, air temperature and soil humidity), on local scale. The organisms within different fragments, on regional scale, were submitted to different climatic conditions, and the edge formation in the forest fragment stimulated microclimatic changes, on local scale, although in a heterogenic way. Not just the distance from the edge influenced the microclimatic differences. Probably, the edge age, location, the matrix structure, as well as, gap...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Canopy openness; Edges; Fragmentation; Soil moisture; Temperature.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700011
Imagem não selecionada

Imprime registro no formato completo
Naphthalene Acetic Acid and Irrigation Regimes Influence Paddy Yield and its Economics under Arid Conditions Planta Daninha
HASNAIN,Z.; BAKHSH,I.; HUSSAIN,I.; SHEHERYAR,; E.A.,KHAN.
ABSTRACT: The study aimed to highlight the impact of naphthalene acetic acid (NAA) and irrigation regimes on the productivity of coarse rice under agro-ecological conditions of Dera Ismail Khan, Pakistan. The experiment was comprised of two factors with four levels (0, 60, 90, 120 mL ha-1) of NAA and irrigation at the depths (60, 75, 90 and 105 cm) of soil profile. The data was interpreted to observe the plant height (cm), productive tillers (m-2), sterility percentage (%), biological yield (t ha-1), and grain yield (t ha-1) of coarse rice. The benefit cost ratio (BCR) was also calculated. The results indicated that the application of NAA was found very effective in improving paddy yield and hence resulted in better BCR value. The maximum paddy yield was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agronomic efficiency; Soil moisture; Growth regulator; Benefit-cost ratio; Oryza sativa.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100207
Imagem não selecionada

Imprime registro no formato completo
Penetration resistance according to penetration rate, cone base size and different soil conditions Bragantia
Junior,Daniel Dias Valadão; Biachini,Aloísio; Valadão,Franciele Caroline Assis; Rosa,Rodrigo Pengo.
This study aimed to evaluate the effect of penetration rate and the size of the cone base on the resistance to penetration under different soil moistures and soil bulk density. The experimental design was completely randomized in a 4x2x2x2 factorial arrangement, with the factors, soil bulk density of 1.0; 1.2; 1.4 and 1.6 Mg m-3, soil moisture at the evaluation of 0.16 and 0.22 kg kg-1, penetration rates of 0.166 and 30 mm s-1 and areas of the cone base of 10.98 and 129.28 mm² resulting in 32 treatments with 8 replicates. To ensure greater uniformity and similarity to field conditions, samples passed through cycles of wetting and drying. Only the interaction of the four factors was not significant. Resistance values varied with the density of the soil,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil bulk density; Soil moisture; Methodology.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000200012
Imagem não selecionada

Imprime registro no formato completo
Planosol soil sample size for computerized tomography measurement of physical parameters Scientia Agricola
Pedrotti,Alceu; Pauletto,Eloy Antonio; Crestana,Silvio; Cruvinel,Paulo Estevão; Vaz,Carlos Manoel Pedro; Naime,João de Mendonça; Silva,Alvaro Macedo da.
Computerized tomography (CT) is an important tool in Soil Science for noninvasive measurement of density and water content of soil samples. This work aims to describe the aspects of sample size adequacy for Planosol (Albaqualf) and to evaluate procedures for statistical analysis, using a CT scanner with a 241Am source. Density errors attributed to the equipment are 0.051 and 0.046 Mg m-3 for horizons A and B, respectively. The theoretical value for sample thickness for the Planosol, using this equipment, is 4.0 cm for the horizons A and B. The ideal thickness of samples is approximately 6.0 cm, being smaller for samples of the horizon B in relation to A. Alternatives for the improvement of the efficiency analysis and the reliability of the results obtained...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lowland; Albaqualf; Bulk density; Compaction; Soil moisture.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400019
Imagem não selecionada

Imprime registro no formato completo
Plántulas de chabacano (Prunus armeniaca L.) y su respuesta fisiológica a ciclos de riego-sequía. Colegio de Postgraduados
Arellano Ojeda, Carlos.
Con el objetivo de identificar la sensibilidad de variables fisiológicas y de crecimiento en plántulas de P. armeniaca, se realizó un experimento bajo cubierta durante el periodo abril-julio del 2013 en Montecillo, Texcoco, Estado de México. Se utilizaron plántulas de siete meses de edad obtenidas a partir de colectas realizadas en la localidad de San Juan Tetla, San Lorenzo Chiautzingo, Puebla. Se estableció un diseño experimental completamente al azar con dos tratamientos y 15 repeticiones, el primero consistió en la aplicación de ciclos repetidos de riego-sequía y el segundo, en la aplicación de riegos frecuentes manteniendo el suelo con valores cercanos a la capacidad de campo (tratamiento testigo). Cada tratamiento se conformó de 75 individuos...
Palavras-chave: Chabacano; Sequía; Humedad en suelo; Apricot; Drought; Soil moisture; Fruticultura; Maestría.
Ano: 2014 URL: http://hdl.handle.net/10521/2373
Imagem não selecionada

Imprime registro no formato completo
Silicon accumulation and water deficit tolerance in Brachiaria grasses Scientia Agricola
Melo,Suzana Pereira de; Korndörfer,Gaspar Henrique; Korndörfer,Clotilde Maria; Lana,Regina Maria Quintão; Santana,Denise Garcia de.
The beneficial effects of silicon (Si) fertilization have been observed for several plant species, especially when submitted to stress, either biotic or abiotic. Among the possible reasons for the greater adaptability and resistance of brachiaria grass in areas of low fertility soils in Brazilian savanna, stands its capacity of absorbing and accumulating Si in aerial parts. To evaluate the effect of Si on dry matter yield of Brachiaria decumbens Stapf and Brachiaria brizantha Hochst, grown under two soil moisture regimes, a trial was set up in a completely randomized design factorial scheme (5 × 2 × 2), with five Si rates: (0; 242; 484; 968 and 1,452 kg ha-1), two soil water tensions (60% and 80% of field capacity) and the two brachiaria species. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcium silicate; Pasture; Water stress; Soil moisture.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400022
Imagem não selecionada

Imprime registro no formato completo
Simulation of bean crop growth, evapotranspiration and yield in Paraná State by the CROPGRO-Drybean model - doi: 10.4025/actasciagron.v33i3.11793 Agronomy
Dallacort, Rivanildo; UNEMAT; Freitas, Paulo Sergio Lourenço de; UEM - Maringá; Faria, Rogério Teixeira; IAPAR; Goncalves, Antonio Carlos Andrade; UEM; Rezende, Roberto; UEM; Guimarães, Rachel Muylaert Locks; UEM.
The performance of the CROPGRO-Drybean model for the prediction of soil water balance, as well as growth components and bean crop yield, was assessed using data from two field experiments conducted at the State University of Maringá Iirrigation Technical Center, Paraná, Brazil, (latitude 23°27'S, longitude 51°57' and altitude 542 m) during the 2005 and 2006 growing seasons. This assessment aimed to analyze growth components, evapotranspiration and bean crop yield for the edaphoclimatic conditions of the area as simulated by the CROPGRO-Drybean model. This is a model for legumes, and it is grouped in a Decision Support System for Agrotechnology Transference (DSSAT). The model simulates growth, development and yield components of beans as a...
Tipo: Pesquisa Empírica de Campo Palavras-chave: 5.03.00.00-8 water stress; Soil moisture; Agrometeorological models 5.03.02.00-0 water stress; Soil moisture; Agrometeorological models.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/11793
Imagem não selecionada

Imprime registro no formato completo
Soil humidity and evapotranspiration under three coffee (Coffea arabica L.) planting densities at Naranjal experimental station (Chinchiná, Caldas, Colombia) Acta Agron. (Palmira)
Bermúdez-Florez,Leidy Natalia; Cartagena-Valenzuela,José Régulo; Ramírez-Builes,Víctor Hugo.
Abstract Coffee cultivation depends on water supplied by rain or irrigation, which, in turn, affect productivity and harvest distribution. Knowing the influence of plant spacing on the behavior of soil moisture and water consumption, is likely to determine a crop’s planting density, fertilization and planting times, all based on regional water availability. In this context, the study was conducted at Naranjal Experimental Station, municipality of Chinchiná (Caldas, Colombia) at 04° 58’ N, 75° 39’ W; 1,381 m a.s.l., aimed to describe moisture performance in a coffee plantation established on an Andisol, under three planting densities. This was done by estimating the evapotranspiration (ETo) and assessing crop evapotranspiration (ETc). Soil moisture was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant spacing; Andisol; Soil moisture; Hydraulic conductivity.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000300402
Imagem não selecionada

Imprime registro no formato completo
Soil water balance simulated by CROPGRO-Drybean model for edaphoclimatic conditions in Maringá AGRIAMBI
Dallacort,Rivanildo; Freitas,Paulo S. L. de; Faria,Rogério T. de; Gonçalves,Antonio C. A.; Jácome,Aleksandra G.; Rezende,Roberto.
The performance of the CROPGRO-Drybeans model for the prediction of soil water balance, as well as growth components and bean crop yield, was assessed using data from two field experiments conducted at the State University of Maringá Irrigation Technical Center, Paraná - Brazil, (latitude 23º27'S, longitude 51º57' and altitude 542 m), during the 2005 and 2006 growing season. The model simulations correlated well with measured soil moisture (r > 0.7) for both experiments. However, there were high discrepancies between measured and simulated soil moisture values on the days after rainfall. In addition, it was found that the model exaggerates the effect of water stress during the flowering phase, which leds to underprediction (19 and 29%) of crop yield.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water stress; Soil moisture; Simulation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000400002
Registros recuperados: 30
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