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A software to calculate soil hydraulic conductivity in internal drainage experiments (SHC, Version 2.00) Rev. Bras. Ciênc. Solo
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
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Balanço das formas de ferro em ecossistema de pastagem nativa da Ilha de Marajó, PA. Repositório Alice
MOLLER, R.; CAMARÃO, A. P..
bitstream/item/205284/1/Balanco-das-formas-de-ferro.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Teor de ferro; Ilha de Marajo; Pará; Brasil; Natural pastures; Biomassa; Pastagem Nativa; Umidade do Solo; Amazonia; Biomass; Iron; Soil water content.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/399183
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Calibracao de um equipamento de TDR para medida de umidade de solos. Repositório Alice
TOMMASELLI, J.T.G.; BACCHI, O.O.S..
Este estudo visou à obtenção das curvas de calibração de um equipamento de TDR (Time Domain Reflectometry) em cinco solos da região de Piracicaba, SP, e testou a adequação da calibração interna do equipamento e das curvas genéricas de calibração. As curvas ajustadas, em cada solo separadamente, apresentaram coeficientes de determinação (R2) da ordem de 0,99, e a curva ajustada para o conjunto de dados dos cinco solos apresentou R2 = 0,976. A análise de erros-padrão de estimativa mostrou que as curvas genéricas não se prestam às aplicações mais sensíveis, tais como na determinação absoluta do conteúdo de água do solo. Os testes de comparação entre as curvas ajustadas, a curva genérica e a curva embutida no equipamento mostraram que a primeira é superior às...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Propriedades dieletricas; Conteudo de agua do solo; Instrumento de medicao; Dielectric properties; Soil water content; Measuring instruments.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104009
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Calibração do sensor de capacitância irrigap para medida da umidade em solo de textura franco argilosa. Repositório Alice
COSTA, B. R. S.; CORREIA, J. S.; BASSOI, L. H..
O uso de sensores de capacitância para a medida da umidade do solo necessita de calibração para garantir o melhor desempenho desses equipamentos, em função da variabilidade dos atributos dos solos. Assim, este estudo teve como objetivo a determinação e avaliação da capacidade preditiva de equações de calibração (obtidas em condições controladas) para o nó sensor capacitivo IRRIGAP, para a medida da umidade do solo de textura franco argilosa, a partir de amostras coletadas em intervalos de profundidade de 0,20-0,30 m e 0,50-0,60 m em área irrigada do município de Juazeiro, BA. Foi verificado que modelos lineares e quadráticos apresentaram desempenho satisfatório para a medida da umidade volumétrica no solo estudado, porem, para ambas as camadas de solo,...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Manejo de água; Sensor de umidade; Solo; Water management; Soil water content; Soil.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1004787
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Calibration of a capacitance probe in a Paleudult Scientia Agricola
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
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Calibration of a soil moisture sensor with disturbed and undisturbed soil samples from Bahia AGRIAMBI
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
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Climate prediction for sustainable production of rainfed groundnuts in sat: crop establishment risks in the Anantapur region Open Agri
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
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Compared performance of penetrometers and effect of soil water content on penetration resistance measurements Rev. Bras. Ciênc. Solo
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
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Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol REA
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
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Deficit irrigation in grapevine cv. Syrah during two growing seasons in the brazilian semiarid REA
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
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Determinacao da tensao de agua em solo agricola usando um sensor de dissipacao de calor. Repositório Alice
OLIVEIRA, C.A. da S..
Um estudo foi realizado sob condicoes de laboratorio e de campo objetivando avaliar um sensor de solo utilizado para determinacao da temperatura e da tensao da agua no solo. Devido a solubilidade do gesso, material poroso utilizado na fabricacao dos sensores, houve reducao em area da secao transversal e volume, e aumento da porosidade efetiva desses sensores, em relacao aos valores observados antes do inicio dos testes. Os valores medios da temperatura observados com os sensores foram praticamente iguais aos observados com um termometro de referencia com precisao de 0,1 Graus C. Quando sensores saturados foram instalados a 5 cm de profundidade em um solo franco-argilo-siltoso secado ao ar, em relacao a valores de Delta T, o tempo de resposta do sensor a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Umidade do solo; Potencial matricial; Temperatura do solo; Soil water content; Matric potential; Soil temperature.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/100716
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Development and adoption of improved chickpea varieties in Myanmar Open Agri
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
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Differences in soil electrical resistivity tomography due to soil water contents in an integrated agricultural system. Repositório Alice
BERNARDI, A. C. de C.; PITRAT, T.; RABELLO, L. M.; PEZZOPANE, J. R. M.; BOSI, C.; MAZZUCO, G. G.; BETTIOL, G. M..
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: Artigo em periódico indexado (ALICE) Palavras-chave: Sistema ARP; Sensor de solo; Teor de água no solo; Resistividade elétrica do solo; ARP system; Soil sensor; Solo; Umidade do Solo; Soil water content.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114214
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Differences in soil electrical resistivity tomography due to soil water contents in an integrated agricultural system PAB
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
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Dye tracer and morphophysical properties to observe water flow in a Gleyic Luvisol Scientia Agricola
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
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Efeito do deficit hidrico no solo sobre o comportamento estomatico e potencial da agua em mudas de seringueira. Repositório Alice
BRUNINI, O.; CARDOSO, M..
O objetivo deste trabalho foi avaliar o efeito do estresse hidrico sobre o potencial da agua na folha da seringueira, a resistencia estomatica, e a recuperacao do potencial de agua na folha. Progenies de polinizacao aberta de seringueira (Hevea spp.), provenientes dos clones IAN 873, RRIM 600, IAN 713 e de pes francos de Hbr, foram cultivadas sob condicoes controladas e submetidas a deficits hidricos crescentes no solo pela suspensao da irrigacao. Sob alta disponibilidade de agua no solo, a resistencia estomatica dos clones IAN 713 e IAN 873 era similar, porem inferior a dos demais. A baixos valores de disponibilidade hidrica no solo, a resistencia estomatica aumentou consideravelmente em todas progenies, e houve uma inversao de posicao entre o IAN 713 e o...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Ajuste osmotico; Teor de agua no solo; Estresse hidrico do solo; Potencial de agua nas folhas; Resistencia estomatica; Umidade de solo; Osmotic adjustment; Soil water content; Soil water deficit; Plant water potencial; Stomatal resistance; Soil moisture.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89520
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Effect of Environmental Factors on Seed Germination and Early Seedling Emergence of Carolina geranium (Geranium carolinianum) Planta Daninha
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 < 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
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Effects of Soil Solarization on Pigeonpea and Chickpea Open Agri
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
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Electrical conductivity of soil irrigated with swine wastewater estimated by time-domain reflectometry¹ Rev. Bras. Ciênc. Solo
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
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Emission of nitrous oxide and carbon dioxide from semi-arid tropical soils in Chiapas México Rev. Bras. Ciênc. Solo
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
Registros recuperados: 58
Primeira ... 123 ... Última
 

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