Consulta: subjectFacets:"Soil moisture"
Registros recuperados: 31
Data/hora: 05/06/2024 02:49:43

Plántulas de chabacano (Prunus armeniaca L.) y su respuesta fisiológica a ciclos de riego-sequía.
Provedor de dados: 32
Autores: 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

Effects of vinasse application under the physical attributes of soil covered with sugarcane straw
Provedor de dados: 70
Autores: 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

CAROLS: A New Airborne L-Band Radiometer for Ocean Surface and Land Observations
Provedor de dados: 5
Autores: 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

The SMOS Mission: New Tool for Monitoring Key Elements of the Global Water Cycle
Provedor de dados: 5
Autores: Kerr, Yann H.; Waldteufel, Philippe; Wigneron, Jean-pierre; Delwart, Steven; Cabot, Francois; Boutin, Jacqueline; Escorihuela, Maria-jose; Font, Jordi; Reul, Nicolas; Gruhier, Claire; Juglea, Silvia Enache; Drinkwater, Mark R.; Hahne, Achim; Martin-neira, Manuel; Mecklenburg, Susanne.
It is now well understood that data on soil moisture and sea surface salinity (SSS) are required to improve meteorological and climate predictions. These two quantities are not yet available globally or with adequate temporal or spatial sampling. It is recognized that a spaceborne L-band radiometer with a suitable antenna is the most promising way of fulfilling this gap. With these scientific objectives and technical solution at the heart of a proposed mission concept the European Space Agency (ESA) selected the Soil Moisture and Ocean Salinity (SMOS) mission as its second Earth Explorer Opportunity Mission. The development of the SMOS mission was led by ESA in collaboration with the Centre National d'Etudes Spatiales (CNES) in France and the Centro para...
Tipo: Text
Palavras-chave: Interferometry; L-band; Sea surface salinity (SSS); Soil moisture; Soil Moisture and Ocean Salinity (SMOS); Vegetation water content.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11483/8065.pdf

Weed emergence in autumn under temperate conditions
Provedor de dados: 87
Autores: Calado,J.M.G.; Basch,G.; Carvalho,M.
The emergence of weed plants depends on environmental conditions, especially temperature and soil moisture. The latter is extremely important in Mediterranean environments which are characterized by irregular amount and distribution of rain throughout the year, which influences the beginning of the growth cycle of the annual species (seed germination). This paper studies the influence of rainfall, in particular accumulated rainfall in autumn, on the emergence of weed plants. The experiment was carried out on Luvisols, and the appearance of flora under field conditions was observed. Through analysis of the results, it can be concluded that a high percentage of weed plants (&gt; 85% related to the highest registered value) was obtained with more than 90 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonal emergence; Mediterranean climate; Rainfall; Seed germination; Soil moisture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000200012

Naphthalene Acetic Acid and Irrigation Regimes Influence Paddy Yield and its Economics under Arid Conditions
Provedor de dados: 87
Autores: 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

Inventory of water storage types in the Blue Nile and Volta River Basins
Provedor de dados: 31
Autores: 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

Water-resource and land-use issues
Provedor de dados: 31
Autores: Calder,   Ian R.
This paper reviews perceived notions of the relationships between catchment land use and hydrology and explores whether much of the widely disseminated folklore, so often inextricably linked with issues of land use, is based on myth or reality. Gaps in our knowledge of the underlying processes in relation to land use and hydrology are identified. Our ability to apply this knowledge at different scales ranging from the plot to the catchment and regional scales are discussed and specific examples are drawn from Indian and African case studies. Methods for linking spatially distributed land-use hydrological models with economics and ecology through decision support systems are outlined and proposed as a framework for the integrated management of land and...
Tipo: Book
Palavras-chave: Water resource management; Water use; Case studies; Catchment areas; Land use; Hydrology; Models; Evaporation; Soil moisture; Decision support tools; Runoff; Flow; Forestry; Deforestation; Erosion; Rain; Environmental Economics and Policy; Land Economics/Use.
Ano: 1998
URL: http://purl.umn.edu/113610

Dielectric constant obtained from TDR and volumetric moisture of soils in southern Brazil
Provedor de dados: 90
Autores: 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

Kinetic parameters of soil β-glucosidase response to environmental temperature and moisture regimes
Provedor de dados: 90
Autores: 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

Water percolation estimated with time domain reflectometry (TDR) in drainage lysimeters
Provedor de dados: 90
Autores: Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira.
Due to the difficulty of estimating water percolation in unsaturated soils, the purpose of this study was to estimate water percolation based on time-domain reflectometry (TDR). In two drainage lysimeters with different soil textures TDR probes were installed, forming a water monitoring system consisting of different numbers of probes. The soils were saturated and covered with plastic to prevent evaporation. Tests of internal drainage were carried out using a TDR 100 unit with constant dielectric readings (every 15 min). To test the consistency of TDR-estimated percolation levels in comparison with the observed leachate levels in the drainage lysimeters, the combined null hypothesis was tested at 5 % probability. A higher number of probes in the water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drainage; Water flow in the soil; Soil moisture.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400009

Carbon dioxide efflux in a rhodic hapludox as affected by tillage systems in southern Brazil
Provedor de dados: 90
Autores: 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

Soil water balance simulated by CROPGRO-Drybean model for edaphoclimatic conditions in Maringá
Provedor de dados: 91
Autores: 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 &gt; 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

24-h variation in soil respiration after a long dry season in a Sudano-Sahelian region
Provedor de dados: 63
Autores: 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

Water extraction variability in the banana root zone affects the reliability of water balance
Provedor de dados: 63
Autores: Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira; Coelho Filho,Maurício Antônio.
Spatial and temporal variability of soil water extraction from the root zone affect soil water balance determination. The number of sensors installed in the root zone in studies addressing water balance is still set arbitrarily. This study provided an investigation of the water extraction process by banana (Musa spp.) roots by (i) determining the variability of water extraction from the banana tree root zone, (ii) detecting differences in the estimation of evapotranspiration (ET) by the soil water balance method when the number of soil profiles monitored in the roots zone varies, (iii) and; determining the minimum number of Time Domain Reflectometry (TDR) probes needed to obtain ET precision and accuracy similar to that determined by a drainage lysimeter....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil moisture; Soil water balance; Water uptake.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100001

Water use and grain yield response of rainfed soybean to tillage-mulch practices in southeastern Nigeria
Provedor de dados: 63
Autores: Obalum,Sunday Ewele; Igwe,Charles Arizechukwu; Obi,Martin Eze; Wakatsuki,Toshiyuki.
Despite the agronomic, economic and food values of soybean (Glycine max L. Merrill), there is still dearth of information on the tillage need and the implications of surface mulch for the crop in the eastern part of the forest-savanna transition zone of Nigeria. This study was therefore carried out on a sandy loam Ultisol at Nsukka with a sub-humid climate, during 2006 and 2007 cropping seasons. Our objective was to devise an appropriate tillage method for the crop from evaluated effects of no-till (NT), conventional tillage (CT) and mulch on selected key agronomic indices. Each of the NT and the CT was either unmulched (U) or mulched (M) in a split-plot, giving four treatments/tillage methods (NTU, NTM, CTU and CTM) randomized in four blocks. Rainfall was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tillage system; Surface mulch; Soil moisture; Soybean grain yield; Water use efficiency.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500007

Silicon accumulation and water deficit tolerance in Brachiaria grasses
Provedor de dados: 63
Autores: 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

Planosol soil sample size for computerized tomography measurement of physical parameters
Provedor de dados: 63
Autores: 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

ผลของวิธีการอนุรักษ์ความชื้นดินต่อผลผลิตสบู่ดำ
Provedor de dados: 106
Autores: Chatchai Worrawetmongkol; Somchai Anusontpornperm; Anchalee Suddhiprakarn; Suphicha Thanachit.
Study on the effectmethod of soil moisture conservation method on yield of Jatropha, variety KUBP78-9 grown on Ultic Paleustalf, was carried out in order to compare the effect of no soil moisture conservation scheme (W1), plant residue mulch (W2), vetiver grass grown between Jatropha rows, slash and mulch (W3), and jack beanast cover crop (W4) on moisture changes within soil profile and yield of Jatropha. Drip irrigation at a rate of twolitres per plant was operated every two days during drought season (Dec 09-May 10). Results indicated that plant residue mulch tended to give the highest seed yield at 15% moisture content (200 kg rai-1) compared to the range of 130.9-145.3 kg rai-1 obtained from other treatments. Growing vetiver grass between rows of...
Tipo: Collection
Palavras-chave: Soil moisture; Jatropha; Mulching; Vetiver grass; Jack bean; สบู่ดำ; การคลุมดิน; หญ้าแฝก; ถั่วพร้า; ความชื้นดิน; ผลผลิต.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5179

Soil humidity and evapotranspiration under three coffee (Coffea arabica L.) planting densities at Naranjal experimental station (Chinchiná, Caldas, Colombia)
Provedor de dados: 109
Autores: 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

Simulation of bean crop growth, evapotranspiration and yield in Paraná State by the CROPGRO-Drybean model - doi: 10.4025/actasciagron.v33i3.11793
Provedor de dados: 1
Autores: 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&amp;deg;27'S, longitude 51&amp;deg;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

Assessment of Influence and Inter-Relationships of Soil Properties in Tropical Grasslands of Central India
Provedor de dados: 111
Autores: 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

Calibration and study of soil physical-hydric relations using a frequency domain reflectometry probe
Provedor de dados: 111
Autores: Duarte, Thiago; Silva, Tonny José Araújo da; Bonfim-Silva, Edna Maria; Souza, Hanna Pricilla Barbosa.
The FDR Diviner 2000® probe is widely used to monitor soil moisture and to study physical-hidric relationships. The calibration equation provided by the manufacturer may not correctly reproduce the actual moisture value for the same type of soil with different bulk densities. In addition, it was postulated in this experiment that the capacitance probe can be used to determine the soil water tension and the initial soil water retention curve. Thus, the objectives were: to assess whether the calibration equation parameters of the FDR probe changes with the bulk density variation; estimate the soil water tension using the FDR probe; and verify the effect of the probe calibration in determining the initial soil water retention curve for the Red Oxisol at three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physics; Soil moisture; Soil compaction; Instrumentation; Diviner 2000®.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6673

Cap-hardening parameters of Cam-clay model variations with soil moisture content and shape-restricted regression model
Provedor de dados: 111
Autores: Mehari Zewde Tekeste; Deere&amp;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

Beans cultivation and water regime on soil physical attributes
Provedor de dados: 111
Autores: 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

Penetration resistance according to penetration rate, cone base size and different soil conditions
Provedor de dados: 53
Autores: 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

Evaluation of DSSAT soil-water balance module under cropped and bare soil conditions
Provedor de dados: 52
Autores: 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

Microclimate of Atlantic forest fragments: regional and local scale heterogeneity
Provedor de dados: 52
Autores: 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

Hydro-physical processes and soil properties correlated with origin of soil hydrophobicity
Provedor de dados: 65
Autores: 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

Wet bulb and Conilon coffee root distribution under drip irrigation
Provedor de dados: 64
Autores: Souza,Joabe Martins de; Reis,Edvaldo Fialho dos; Bonomo,Robson; Garcia,Giovanni de Oliveira.
ABSTRACT Knowledge of the wet bulb and the root system of the Conilon coffee plant is highly important for the correct management of irrigation. Therefore, the aim of this work was to characterize the wet bulb and Conilon coffee root distribution under drip irrigation. The experiment was conducted in the city of São Mateus, ES, Brazil with five replications of a completely randomized design of a 4 x 6 split-plot scheme, which represents four points located according to plant location and six depths. Two points were located in the plant line and two points between lines. For row spacing, we used a split-plot scheme 5 x 6 with five points in relation with plant location and six depths with five replications. The coffee roots were analysed by volume,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Soil moisture; Irrigation management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100093

Correcting field determination of elemental contents in soils via portable X-ray fluorescence spectrometry
Provedor de dados: 64
Autores: 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