Consulta: subjectFacets:"Soil water content"
Registros recuperados: 41
Data/hora: 15/06/2024 12:34:36

Deficit irrigation in grapevine cv. Syrah during two growing seasons in the brazilian semiarid
Provedor de dados: 70
Autores: Bassoi,Luís H.; Correia,Joselina de S.; Santos,Ana R. L. dos; Silva,Juliano A.; Costa,Bruno R. S.
Irrigation plays an important role for grape’s yield as well as on its quality for winemaking. Thus, the effects of deficit irrigation strategies on yield and quality of wine grapes cv. Syrah were evaluated in Petrolina, State of Pernambuco, Brazil. Evaluations were carried out throughout the second and third growing seasons, which were from November 2010 to February 2011 (rainy season) and from May to September 2011 (dry season), respectively. Vines were drip irrigated and the experimental design was completely randomized with three treatments and four replications. The treatments were full irrigation (FI), performed according crop evapotranspiration; regulated deficit irrigation (RDI), in which irrigation was interrupted in phenological growth stage of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Soil water content; Leaf water potential.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300430

STATISTICAL CONTROL OF PROCESSES APLIED FOR PEANUT MECHANICAL DIGGING IN SOIL TEXTURAL CLASSES
Provedor de dados: 70
Autores: Zerbato,Cristiano; Furlani,Carlos E. A.; Silva,Rouverson P. da; Voltarelli,Murilo A.; Santos,Adão F. Dos.
ABSTRACT The digging of peanut, which has the pod production in the subsurface, is directly affected by soil conditions, physical or environmental characteristics, at the time of operation and may be the cause of unwanted losses. Therefore, the quality of the operation is very important for minimizing these losses. Thus, this study aimed to evaluate the quality of mechanized digging operation of peanut according to three soil textural classes (Sandy, Medium and Loamy) and their water content conditions at operation through statistical process control. The experiment was conducted at three locations in the state of São Paulo, Brazil, under sampling scheme arranged in tracks and 40 sampling points for each textural class of soil, using the mechanical digging...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea L; Losses; Quality; Soil water content; Water content of the pods.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200315

Variations on the expertise of two attributes of physical soil due to differences in the method of global satellite navigation
Provedor de dados: 70
Autores: CRISTIANO,ZERBATO; COMPAGNON,ARIEL M.; VOLTARELLI,MURILO A.; ROSALEN,DAVID L.; FURLANI,CARLOS E. A.
ABSTRACT The mechanical resistance to penetration when related to the water content is an indicator often used of soil compaction, the use of positioning methods for greater accuracy of this review is important. In this context, this study aimed to determine the variability of positioning methods provided by GPS receivers to determine the spatial behavior of physical attributes related to soil compaction. The study area is located in the municipality of Jaboticabal, around the latitude 21º15’22”S and longitude 48º18’58”W, being characterized with a clayey Oxisol. The variables used as parameters of soil physical properties were the mechanical resistance to penetration and water content, using a sampling grid of 20 x 20 m, totaling 60 points. We used six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GPS; Penetrometer; Soil compaction; Soil water content.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400696

Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol
Provedor de dados: 70
Autores: Soncela,Rosimaldo; Sampaio,Silvio C.; Vilas Boas,Marcio A.; Tavares,Maria H. F.; Smanhotto,Adriana.
The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apparent dielectric constant; Time-domain reflectometry; Soil water content.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500004

GPS receivers for georeferencing of spatial variability of soil attributes
Provedor de dados: 70
Autores: Rosalen,David L; Rodrigues,Marcos S; Chioderoli,Carlos A; Brandão,Flavia J. C; Siqueira,Diego S.
The characterization of the spatial variability of soil attributes is essential to support agricultural practices in a sustainable manner. The use of geostatistics to characterize spatial variability of these attributes, such as soil resistance to penetration (RP) and gravimetric soil moisture (GM) is now usual practice in precision agriculture. The result of geostatistical analysis is dependent on the sample density and other factors according to the georeferencing methodology used. Thus, this study aimed to compare two methods of georeferencing to characterize the spatial variability of RP and GM as well as the spatial correlation of these variables. Sampling grid of 60 points spaced 20 m was used. For RP measurements, an electronic penetrometer was used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; GNSS; Compaction; Soil water content.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600013

Management for improved water use efficiency in the dry areas of Africa and West Asia
Provedor de dados: 30
Autores: M.
Palavras-chave: Tillage; Soil water; Lentils; Wheats; Water harvesting; Runoff; Chickpeas; Fallow systems; Zero tillage; Soil water content.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4239

Development and adoption of improved chickpea varieties in Myanmar
Provedor de dados: 30
Autores: Than, A.M.
Palavras-chave: Chickpeas; On-farm research; Breeds (animals); Agricultural extension; Soil water content; Germplasm; Yields; Area; Weather hazards; Demand.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3333

Climate prediction for sustainable production of rainfed groundnuts in sat: crop establishment risks in the Anantapur region
Provedor de dados: 30
Autores: S.M.
Palavras-chave: Groundnuts; Sowing date; Precipitation; Products; Cropping systems; Agroclimatic zones; Weather data; Soil water content; Yields; Crops.
Ano: 1999
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4214

Effects of Soil Solarization on Pigeonpea and Chickpea
Provedor de dados: 30
Autores: Y.S.
Palavras-chave: Pigeonpeas; Chickpeas; Soil solarization; Genotypes; Soil water content; Soil sampling; Dry matter; Root nodulation; Rhizobium; Weeds.
Ano: 1988
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4075

Identification of large-seeded high-yielding diverse kabuli accessions in newly assembled Chickpea germplasm
Provedor de dados: 30
Autores: H.D. Upadhyaya.
Palavras-chave: Chickpeas; Germplasm; Early maturation; Genotypes; Agronomic characters; Fungi; Chlorophylls; Soil water content; Seed treatment; Grain legumes.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3180

ICC 4958 A Drought Resistant Chickpea
Provedor de dados: 30
Palavras-chave: Drought resistance; Genotypes; Weather hazards; Chickpeas; Segregation; Genetic soil types; Germplasm; Soil water content; Grain legumes; Tolerance.
Ano: 1992
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3830

Field diagnosis of chickpea diseases and their control
Provedor de dados: 30
Autores: Y.L.
Palavras-chave: Chickpeas; Fungi; Phoma; Vegetative stage; Mycoplasma; Necrosis; Diseases; Sowing date; Soil water content; Fruits.
Ano: 1991
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4248

Extra-large Kabuli chickpea with high resistance to Fusarium wilt
Provedor de dados: 30
Autores: P.M. Gaur.
Palavras-chave: Chickpeas; Early maturation; Agronomic characters; Germplasm; Genotypes; Breeds (animals); Soil water content; Gene banks; Fungi; Grain legumes.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3182

Differences in soil electrical resistivity tomography due to soil water contents in an integrated agricultural system
Provedor de dados: 86
Autores: Bernardi,Alberto Carlos de Campos; Pitrat,Thomas; Rabello,Ladislau Marcelino; Pezzopane,José Ricardo Macedo; Bosi,Cristiam; Mazzuco,Giulia Guillen; Bettio,Giovana Maranhão.
Abstract: The objective of this work was to characterize the spatial variability of soil electrical resistivity due to different soil moisture contents, in an integrated agricultural system. Soil electrical resistivity (ER) was measured with the Automatic Resistivity Profiling (ARP) contact sensor in two dates, in 2016, in a 9.7-ha area with different soil moisture contents. The obtained maps indicated that ER allowed delimiting the regions within the study area and pointing out differences in the movement and accumulation of water in the soil horizons. Although there is a trend of reduction in ER values with increasing soil moisture, the spatial correlation structure of ER is similar.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ARP system; Soil sensor; Soil water content.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000100601

Influence of woody species on aerial growth of perennial grasses in semi-arid rangelands of central Argentina
Provedor de dados: 85
Autores: Blazquez,FR; Peláez,DV; Andrioli,RJ; Elia,OR.
The interaction between woody and grass species in semi-arid rangelands of central Argentina was assessed through the evaluation of the impact of woody species on grass growth over a 2-y period. The study comprised two morpho-physiologically different woody species and two cool-season perennial grass species highly preferred by domestic livestock. The study involved the assessment of total green length (TGL) and number of green leaves (NGL) per tiller in grasses growing beneath the canopy of woody species and in open rangeland areas. Soil temperature, pH and water, nitrogen, phosphorus and organic matter content were estimated at the same study sites. Precipitation during the study period was also recorded. Woody species induced higher TGL of grasses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy architecture; Soil temperature; Soil water content; Tiller green length.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200023

Effect of Environmental Factors on Seed Germination and Early Seedling Emergence of Carolina geranium (Geranium carolinianum)
Provedor de dados: 87
Autores: LIU,X.; ZONG,T.; LI,Y.; ZHOU,X.; BAI,L.
ABSTRACT: Carolina geranium (Geranium carolinianum) is an emerging invasive weed in rape and wheat fields in China. A better understanding of its germination and emergence ecology will enable the development of integrated weed control strategies. In this study, we investigated the effects of temperature, photoperiod, soil water content, salinity, and burial depth, on germination and emergence of Carolina geranium. Germination percentages were over 74% under 15/20 and 20/25 oC night/day temperature regimes. Germination rate was independent of light/dark regime. Increasing salinity reduced germination of Carolina geranium from 81.1% at 0 mM to 0% at 160 mM NaCl. Seeds germination was peaked at 50% soil moisture, but was completely inhibited at &lt; 20% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Photoperiod; Salinity stress; Soil water content; Burial depth.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100335

Modeling Root Growth, Crop Growth and N Uptake of Winter Wheat Based on SWMS_2D: Model and Validation
Provedor de dados: 90
Autores: Yang,Dejun; Bian,Zhengfu; Zhang,Kefeng; Xiong,Jibing; Lei,Shaogang.
ABSTRACT Simulations for root growth, crop growth, and N uptake in agro-hydrological models are of significant concern to researchers. SWMS_2D is one of the most widely used physical hydrologically related models. This model solves equations that govern soil-water movement by the finite element method, and has a public access source code. Incorporating key agricultural components into the SWMS_2D model is of practical importance, especially for modeling some critical cereal crops such as winter wheat. We added root growth, crop growth, and N uptake modules into SWMS_2D. The root growth model had two sub-models, one for root penetration and the other for root length distribution. The crop growth model used was adapted from EU-ROTATE_N, linked to the N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agro-hydrological model; FEM; Root length distribution; Soil water content.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100520

Compared performance of penetrometers and effect of soil water content on penetration resistance measurements
Provedor de dados: 90
Autores: Mome Filho,Edison Aparecido; Silva,Alvaro Pires da; Figueiredo,Getulio Coutinho; Gimenes,Fernando Henrique Setti; Vitti,André Cesar.
Modern agriculture techniques have a great impact on crops and soil quality, especially by the increased machinery traffic and weight. Several devices have been developed for determining soil properties in the field, aimed at managing compacted areas. Penetrometry is a widely used technique; however, there are several types of penetrometers, which have different action modes that can affect the soil resistance measurement. The objective of this study was to compare the functionality of two penetrometry methods (manual and automated mode) in the field identification of compacted, highly mechanized sugarcane areas, considering the influence of soil water volumetric content (θ) on soil penetration resistance (PR). Three sugarcane fields on a Rhodic Eutrudrox...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Mechanization; Compaction; Soil water content.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300006

Emission of nitrous oxide and carbon dioxide from semi-arid tropical soils in Chiapas México
Provedor de dados: 90
Autores: Ponce-Mendoza,Alejandro; Ceballos-Ramírez,Juan Manuel; Gutierrez-Micelli,Federico; Dendooven,Luc.
The semi-arid region of Chiapas is dominated by N2 -fixing shrubs, e.g., Acacia angustissima. Urea-fertilized soil samples under maize were collected from areas covered and uncovered by A. angustissima in different seasons and N2O and CO2 emissions were monitored. The objective of this study was to determine the effects of urea and of the rainy and dry season on gas emissions from semi-arid soil under laboratory conditions. Urea and soil use had no effect on CO2 production. Nitrons oxide emission from soil was three times higher in the dry than in the rainy season, while urea fertilization doubled emissions. Emissions were twice as high from soil sampled under A. angustissima canopy than from arable land, but 1.2 lower than from soil sampled outside the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acacia angustissima; Denitrification; Nitrification; Soil water content; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500015

Pedotransfer functions related to spatial variability of water retention attributes for lowland soils
Provedor de dados: 90
Autores: Nebel,Álvaro Luiz Carvalho; Timm,Luís Carlos; Cornelis,Wim; Gabriels,Donald; Reichardt,Klaus; Aquino,Leandro Sanzi; Pauletto,Eloy Antonio; Reinert,Dalvan José.
The estimation of non available soil variables through the knowledge of other related measured variables can be achieved through pedotransfer functions (PTF) mainly saving time and reducing cost. Great differences among soils, however, can yield non desirable results when applying this method. This study discusses the application of developed PTFs by several authors using a variety of soils of different characteristics, to evaluate soil water contents of two Brazilian lowland soils. Comparisons are made between PTF evaluated data and field measured data, using statistical and geostatistical tools, like mean error, root mean square error, semivariogram, cross-validation, and regression coefficient. The eight tested PTFs to evaluate gravimetric soil water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water content; Planosol; Gleisol; Hydraulic properties; Geostatistics; Regression models.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300008

Electrical conductivity of soil irrigated with swine wastewater estimated by time-domain reflectometry¹
Provedor de dados: 90
Autores: Soncela,Rosimaldo; Sampaio,Silvio Cesar; Vilas Boas,Marcio Antonio; Tavares,Maria Hermínia Ferreira; Souza,Claudinei Fonseca; Soncela,Adriana Smanhotto.
Wastewater application to soil is an alternative for fertilization and water reuse. However, particular care must be taken with this practice, since successive wastewater applications can cause soil salinization. Time-domain reflectometry (TDR) allows for the simultaneous and continuous monitoring of both soil water content and apparent electrical conductivity and thus for the indirect measurement of the electrical conductivity of the soil solution. This study aimed to evaluate the suitability of TDR for the indirect determination of the electrical conductivity (ECse) of the saturated soil extract by using an empirical equation for the apparatus TDR Trase 6050X1. Disturbed soil samples saturated with swine wastewater were used, at soil proportions of 0,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Soil salinity; Soil water content; Water reuse.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400023

A software to calculate soil hydraulic conductivity in internal drainage experiments (SHC, Version 2.00)
Provedor de dados: 90
Autores: Dourado Neto,Durval; Reichardt,Klaus; Silva,Adriana Lúcia da; Bacchi,Osny Oliveira Santos; Timm,Luis Carlos; Oliveira,Júlio César Martins; Nielsen,Donald R.
A software for the calculation of unsaturated soil hydraulic conductivity K(theta) is presented for commonly used methods found in the literature, based on field experiments in which a soil profile is submitted to water infiltration followed by internal drainage. The software is available at: dourado@esalq.usp.br.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Internal drainage; Soil water content; Water infiltration.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000500037

Calibration of a soil moisture sensor with disturbed and undisturbed soil samples from Bahia
Provedor de dados: 91
Autores: Lima,João G. A.; Oliveira,Aureo S. de; Souza,Luciano da S.; Silva,Neilon D. da; Viana,Paula C.
ABSTRACT The objective of this study was to evaluate the models proposed by manufacturers and in the literature with respect to soil moisture measurement and to evaluate the performance of the CS616 sensor in the calibration of disturbed and undisturbed soil samples. These calibrations were performed using linear and quadratic models. Disturbed samples were collected in São Gabriel/BA, six samples placed in pots, whereas undisturbed samples were collected in Cruz das Almas/BA, three samples directly collected in the area and placed in a container. A calibration was performed between 21/12/2016 and 08/01/2017. The models proposed in the literature and by manufacturers differed in the estimation of volumetric soil moisture. Disturbed soil samples had higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water content; Time domain reflectometry; Soil physics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000696

Sensor placement for soil water monitoring in lemon irrigated by micro sprinkler
Provedor de dados: 91
Autores: Coelho,Eugênio F.; Santos,Delfran B. dos; Azevedo,Carlos A. V. de.
This research had as its objective the investigation of an alternative strategy for soil sensor placement to be used in citrus orchards irrigated by micro sprinkler. An experiment was carried out in a Tahiti lemon orchard under three irrigation intervals of 1, 2 and 3 days. Soil water potential, soil water content distribution and root water extraction were monitored by a time-domain-reflectometry (TDR) in several positions in soil profiles radial to the trees. Root length and root length density were determined from digital root images at the same positions in the soil profiles where water content was monitored. Results showed the importance of considering root water extraction in the definition of soil water sensor placement. The profile regions for soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tensiometer; Soil water content; Soil water potential; Irrigation management.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662007000100006

Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil
Provedor de dados: 91
Autores: Gondim,Patrícia S. de S.; Lima,José R. de S.; Antonino,Antonio C. D.; Hammecker,Claude; Silva,Renan A. B. da; Gomes,Clarissa A.
A micrometeorological experiment was conducted over grasslands in a semi-arid region of north-eastern Brazil (São João, Pernambuco) from January to December 2011, using the Bowen ratio energy balance method, to improve the current understanding of energy partitioning and water vapour exchange over this ecosystem in this region. The objectives of the present study were to quantify the seasonal and diurnal variations in energy and water vapour exchanges over grasslands and understand the biotic and abiotic factors controlling the energy partitioning of this ecosystem. In the dry period, the low stored soil water limited the grass production and leaf area index, and as a consequence of these conditions, most of the annual net radiation (58%) was consumed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Soil water content; Leaf area index.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003

Water potential in peach branches as a function of soil water storage and evaporative demand of the atmosphere
Provedor de dados: 94
Autores: Monteiro,Alex Becker; Reisser Júnior,Carlos; Romano,Luciano Recart; Timm,Luís Carlos; Toebe,Marcos.
Abstract  The use of water potential indicators in the plant has been adopted in irrigation management, in recent years, since it is accepted that the plant is the best indicator of its own water status. The objective of this study was to verify the relationship between water potential in peach tree branches and the evaporative demand of the atmosphere and the water availability in two textural classes of an Aquertic Hapludalf soil, aiming to adopt irrigation management strategies based on the water potential in the plant. Research was carried out in a commercial peach orchard, cv. Esmeralda, in the municipality of Morro Redondo-Rio Grande do Sul state, Brazil. Four peach tree rows were evaluated, being two irrigated and two non irrigated. The irrigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica (L.); Water status; Evapotranspiration; Soil water content; Irrigation management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000100702

Response of the TDR sensor to moisture under different types of management of a typical Latosol in the Cerrado
Provedor de dados: 124
Autores: Guimarães,Claudinei Martins; Costa,Carlos Alexandre Gomes; Carneiro,Leandro Flávio; Assunção,Hildeu Ferreira da.
ABSTRACT The technique of Time Domain Reflectometry (TDR) is important in the evaluation of soil moisture due to being an instantaneous method, which is non-destructive, precise and little dependent on environmental factors. However, researchers have emphasised the need for continuous specific calibration for each soil-management situation. The aim of this work therefore, was to evaluate the response of a portable TDR sensor to soil moisture in a Dystroferric Red Latosol in the Cerrado, under three different systems of soil management and at three different depths in the soil profile. To do this, TDR equipment consisting of two rods, each 0.12 m in length, was used for instantaneous measurement of the volumetric water content of the soil. The depths of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water content; Soil management; Dielectric permittivity; Cropping systems; Time domain reflectrometry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100001

Neutron probe measurement of soil water content close to soil surface
Provedor de dados: 63
Autores: Falleiros,M.C.; Ravelo Sanchez,A.; Souza,M.Dornelas de; Bacchi,O.O.S.; Pilotto,J.E.; Reichardt,K.
The problem of neutron probe soil water content measurements close to soil surface is analysed from the spatial variability and also from the slow neutron "loss" to the atmosphere points of view. Results obtained on a dark red latosol of the county of Piracicaba,SP, indicate the possibility of precisely measuring the neutron "sphere of influence" when different media are used on soil surface.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutron probe; Soil water content; Spatial variability.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300002

Software to model soil water retention curves (SWRC, version 2.00)
Provedor de dados: 63
Autores: Dourado-Neto,Durval; Nielsen,Donald R.; Hopmans,Jan W.; Reichardt,Klaus; Bacchi,Osny Oliveira Santos.
A software for the adjustment of soil water retention curves (SWRC) is presented, using twelve models found in the literature.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Soil matric potential; Soil water content; Retention.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100031

Soil moisture calibration of TDR multilevel probes
Provedor de dados: 63
Autores: Serrarens,Daniel; MacIntyre,Jim L.; Hopmans,Jan W.; Bassoi,Luis H.
Time domain reflectometry (TDR) probes are increasingly used for field estimation of soil water content. The objective of this study was to evaluate the accuracy of the multilevel TDR probe under field conditions. For this purpose, eight such TDR probes were installed in small plots that were seeded with beans and sorghum. Data collection from the probes was such that soil moisture readings were automated and logged using a standalone field unit. Neutron probe measurements were used to calibrate the TDR probes. Soil-probe contact and soil compaction were critical to the accuracy of the TDR, especially when a number of TDR probes are combined for a single calibration curve. If each probe is calibrated individually, approximate measurement errors were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Soil water content; Neutron probe.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200024

Seasonality of soil water exchange in the soybean growing season in southern Brazil
Provedor de dados: 63
Autores: Moreira,Virnei Silva; Roberti,Débora R.; Minella,Jean Paolo; Gonçalves,Luis Gustavo G de; Candido,Luiz Antônio; Fiorin,Jackson E.; Moraes,Osvaldo L. L.; Timm,Andréa U.; Carlesso,Reimar; Degrazia,Gervásio Annes.
The processes of water transfer in the soil-plant-atmosphere system are strongly affected by soil use and management. Differences in the dynamics of soil water transfer between no-tillage (NT) and conventional tillage (CT) practices during a soybean (Glycine max) growing season in southern Brazil were assessed in this study. All the water balance components were analyzed during the soybean growing season (2009/2010). Rainfall, runoff, soil water storage and hydro-physical soil properties were analyzed under two tillage systems. The land-atmosphere water vapor exchanges, obtained from eddy covariance stations, were analyzed with regard to the soybean agroecosystem. Characterizations of soil water storage were also formulated in the 2006/2007 and 2008/2009...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water balance; Soil water content; Evapotranspiration; No-tillage; Conventional tillage.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200103

Calibration of a capacitance probe in a Paleudult
Provedor de dados: 63
Autores: Silva,Cláudio Ricardo da; Andrade Júnior,Aderson Soares de; Alves Júnior,José; Souza,Antonio Barros de; Melo,Francisco de Brito; Coelho Filho,Maurício Antonio.
The use of capacitance sensors is one of the methods used to quantitatively measure soil water contents (theta, m³ m-3). Sensors provide readings at desired depths and time intervals. A capacitance probe (Diviner 2000) was calibrated for a Rhodic Paleudult from the Piaui State, Brazil. Six access tubes were installed in a 5 × 2 m grid arrangement. Three moisture levels (saturated, moist and dry) were used in two replications. Probe readings and soil samplings to determine theta were made at 0.1 m depth intervals down to a depth of 1.0 m. A power calibration equation was developed for each depth as well as for the entire soil profile (Root Mean Square Error = 0.014, R² = 0.93) for a theta range of 0.068 to 0.264 m³m-3. A separate calibration for each depth...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: FDR probe; Sensor; Irrigation; Soil water content.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600012

Dye tracer and morphophysical properties to observe water flow in a Gleyic Luvisol
Provedor de dados: 63
Autores: Salvador,Monica Martins Silva; Köhne,Sigrid; Köhne,John Maximilian; Lennartz,Bernd; Libardi,Paulo Leonel.
The understanding of the preferential water flow and solute transport is important with regard to losses of nutrients and pesticides that affect the quality of the groundwater or surface water resources. Experiments using the brilliant blue dye tracer, a tension infiltrometer (TI) and a double square infiltrometer (DI) were carried out in the experimental field site located around 15 km southeast of the city of Rostock (North-Eastern Germany) on arable land in a Pleistocene lowland landscape where corn (Zea mays L.) and barley (Hordeum spp.) had been cultivated. One day after dye the infiltration, a pit was dug and vertical profiles were prepared in the TI and DI sites to assess the dye pathways in the subsoil of a Gleyic Luvisol. We wanted to examine if...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water content; Bulk density; Cone resistance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200005

Neutron probe calibration correction by temporal stability parameters of soil water content probability distribution
Provedor de dados: 63
Autores: Reichardt,K.; Portezan,O.; Bacchi,O.O.S.; Oliveira,J.C.M; Dourado-Neto,D.; Pilotto,J.E.; Calvache,M.
A neutron probe calibration correction is proposed in order to reduce soil water content variability, assumed to be a consequence of improper calibrations relations. The time stability of spatially measured soil water content data is used to correct the intercepts of linear calibration relations. This procedure reduced the coefficients of variation of soil water content data from 4 to less than 2% in a Rhodic Kanhapludalf.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water content; Neutron probe; Calibration; Time stability; Spatial variability.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300003

Growth and water use of corn as affected by tillage practices and irrigation frequencies
Provedor de dados: 106
Autores: Tawatchai Na Nagara; Chakranopakhun Tongyai; Paiboon Rattanaprateep.
2 ill., 2 tables
Palavras-chave: Corn; Maize; Tillage; Irrigation; Growth; Yields; Water use; Soil water content; ข้าวโพด; การไถพรวน; การใช้น้ำชลประทาน; อัตราการเจริญเติบโต.
Ano: 1983
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4135

Improvement of the soil quality under intercropped conilon coffee (Coffea canephora P.) in the coastal tablelands of Southeast Brazil
Provedor de dados: 109
Autores: Soares de Souza,Gustavo; Thiengo,Cássio Carlette; de Assis Silva,Samuel; Armani Borghi,Edinei José.
Abstract The objective of this study was to evaluate the physical- hydrological and chemical properties and organic carbon stock of soil under intercropped conilon coffee (Coffea canephora P.) and in full sun in the coastal tablelands of Espírito Santo, Brazil. The treatments evaluated were coffee intercropped with rubber tree (CR) and in full sun (FS) in the area 1; coffee intercropped with papaya (CP) and in full sun (FS) in the area 2; coffee intercropped with coconut (CC), in full sun (FS), and an area of native vegetation (NV) in the area 3. The physical and chemical properties of the soil and its organic carbon stocks were measured in layers of 0-0.4 m. In area 1, CR showed lower soil bulk density and temperature, and higher total porosity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroforestry system; Agroecology; Shade coffee; Soil fertility; Soil water content.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000300271

Proposing an Appropriate Soil Water Content Estimation Technique for Iran
Provedor de dados: 111
Autores: Karimi, Hadi; Ghassemzadeh, Hamid Reza; Pashaee, Payam; Zarei Shahamat, Ebrahim.
Limitation of water resources is one of the major factors in the agricultural development of Iran. In recent years. Iran suffers from increases water consumption and drought conditions, This is why efficient water management in agriculture production becomes an inevitable requirement. One of the main aspects of water management in agriculture production is operating any type of irrigation system efficiently. A good on-farm irrigation water management requires a routine monitoring of soil water content (SWC). Recently a substantial number of different experimental methods in categories of direct, indirect, ground based and remote sensing have been developed to determine the SWC, and a large body of knowledge is now available on theory and applications. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iran; Water management; Soil water content; Water estimation technique.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3054

Proposing an Appropriate Soil Water Content Estimation Technique for Iran
Provedor de dados: 111
Autores: Hadi Karimi; University of Tabriz; Hamid Reza Ghassemzadeh; University of Tabriz; Payam Pashaee; University of Tabriz; Ebrahim Zarei Shahamat; University of Tabriz.
Limitation of water resources is one of the major factors in the agricultural development of Iran. In recent years. Iran suffers from increases water consumption and drought conditions, This is why efficient water management in agriculture production becomes an inevitable requirement. One of the main aspects of water management in agriculture production is operating any type of irrigation system efficiently. A good on-farm irrigation water management requires a routine monitoring of soil water content (SWC). Recently a substantial number of different experimental methods in categories of direct, indirect, ground based and remote sensing have been developed to determine the SWC, and a large body of knowledge is now available on theory and applications. The...
Palavras-chave: Iran; Water management; Soil water content; Water estimation technique.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3054

Replacing clean fallow with minimum tilled pulse legume in a subtropical dryland at Pothwar, Pakistán
Provedor de dados: 115
Autores: Sohail-Ijaz,Shahzada; Ali,Safdar.
Clean fallowing has been criticized in the recent past due to the fact that it causes accelerated soil erosion, emission of CO2 to the atmosphere and reduction in farm income. In an effort to reduce fallowing in Pothwar, Pakistan, field experiments were carried out from 2005 through 2008 at three locations (Rawalpindi, Chakwal and Fateh Jang). The experimental design was split-plot and treatments were applied as follows: conventional cultivator, moldboard plow and minimum tillage in main plots; fallow, legume (mungbean, Vigna radiata) and mulch of wheat straw were used in sub plots. Wheat (Triticum aestivum) was planted in all the subplots during winter. All the treatment plots had equivalent volumetric water content at wheat planting. Consequently, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fallow; Tillage; Mungbean; Soil water content; Wheat; Gross margins.
Ano: 2011
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000100005

Extending the integrated Richards Equation method to new boundary conditions: model description and validation
Provedor de dados: 115
Autores: Yang,Dejun; Zhang,Tuqiao; Zhang,Kefeng; Lei,Shaogang.
There is a need for developing an accurate and simple method, which can be widely used in agro-hydrological models. The Integrated Richards Equation method is a good and simple method to simulate cyclic movement of water in the soil-atmosphere system. However, this method still has some unsolved problems and it is needed for further development if used in agro-hydrological simulation. In this study, the Integrated Richards Equation method was further developed for the agro-hydrological simulation by introducing the commonly used soil hydraulic functions, top and lower boundary conditions. Infiltration numerical experiments and a lab evaporation experiment were used for the validation of the model's capabilities of modelling infiltration and evaporation,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaporation; Agro-hydrological simulation; Infiltration; Integrated Richards Equation; Runoff; Soil water content.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000700002

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis
Provedor de dados: 42
Autores: Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.
Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016