| Registro completo |
| Provedor de dados: |
Scientia Agricola
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| País: |
Brazil
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| Título: |
Calibration of a capacitance probe in a Paleudult
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| 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
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| Data: |
2007-12-01
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| Ano: |
2007
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| Palavras-chave: |
FDR probe
Sensor
Irrigation
Soil water content
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| Resumo: |
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 improves the correlation coefficient and minimizes RMSE. Site-specific calibration improves the accuracy for soil water monitoring.
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| Tipo: |
Info:eu-repo/semantics/report
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600012
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| Editor: |
São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
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| Relação: |
10.1590/S0103-90162007000600012
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| Formato: |
text/html
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| Fonte: |
Scientia Agricola v.64 n.6 2007
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| Direitos: |
info:eu-repo/semantics/openAccess
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