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| Registros recuperados: 33 | |
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| 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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| 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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| 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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| 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... |
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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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| 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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| Zribi, Mehrez; Parde, Mickael; Boutin, Jacqueline; Fanise, Pascal; Hauser, Daniele; Dechambre, Monique; Kerr, Yann; Leduc-leballeur, Marion; Reverdin, Gilles; Skou, Niels; Sobjaerg, Sten; Albergel, Clement; Calvet, Jean Christophe; Wigneron, Jean Pierre; Lopez-baeza, Ernesto; Rius, Antonio; Tenerelli, Joseph. |
| The "Cooperative Airborne Radiometer for Ocean and Land Studies" (CAROLS) L-Band radiometer was designed and built as a copy of the EMIRAD II radiometer constructed by the Technical University of Denmark team. It is a fully polarimetric and direct sampling correlation radiometer. It is installed on board a dedicated French ATR42 research aircraft, in conjunction with other airborne instruments (C-Band scatterometer-STORM, the GOLD-RTR GPS system, the infrared CIMEL radiometer and a visible wavelength camera). Following initial laboratory qualifications, three airborne campaigns involving 21 flights were carried out over South West France, the Valencia site and the Bay of Biscay (Atlantic Ocean) in 2007, 2008 and 2009, in coordination with in situ field... |
| Tipo: Text |
Palavras-chave: Radiometer; CAROLS; L band; SMOS; Ocean salinity; Soil moisture. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00240/35118/33615.pdf |
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| Dijair,Thaís Santos Branco; Silva,Fernanda Magno; Teixeira,Anita Fernanda dos Santos; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton. |
| ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been useful worldwide for determining soil elemental content under both field and laboratory conditions. However, the field results are influenced by several factors, including soil moisture (M), soil texture (T) and soil organic matter (SOM). Thus, the objective of this work was to create linear mathematical models for conversion of Al2O3, CaO, Fe, K2O, SiO2, V, Ti and Zr contents obtained by pXRF directly in field to those obtained under laboratory conditions, i.e., in air-dried fine earth (ADFE), using M, T and SOM as auxiliary variables, since they influence pXRF results. pXRF analyses in field were performed on 12 soil profiles with different parent materials. From them, 59 samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PXRF; Soil moisture; Soil texture; Soil organic matter; Prediction models. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100211 |
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| 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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| 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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| 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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| 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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| 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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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 33 | |
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