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| Registros recuperados: 41 | |
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| 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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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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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| 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 |
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| Registros recuperados: 41 | |
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