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| 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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| 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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| Smanhotto,Adriana; Sampaio,Silvio César; Bosco,Tatiane Cristina Dal; Prior,Maritane; Soncela,Rosimaldo. |
| This study aimed at evaluating the effects of pig slurry application with mineral fertilizer on ions leaching from the soil in soybean crop. The experiment was carried out in 24 drainage lysimeters under protection. The soybean cultivar CD 202/COODETEC was sown in a soil that received 0, 100, 200 and 300 m³ha-1of pig slurry in one cycle, with or without mineral fertilizer. There were three samplings of soil throughout the trial to determine the pH, N, NO3-, K+, Ca2+, Mg2+, Na+, Cu+2, Zn+2, OM, CEC, EC and SAR six times during the crop cycle. The yield was determined in the plants. In soil, pig slurry increased the concentrations of pH, NO3-, K+, Zn+2, OM and CEC, while mineral fertilizer increased P and Zn+2concentrations. The limits observed for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic fertilization; Soil pollution; Environment contamination; Soybean culture. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500003 |
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