Metrological assessment of TDR performance for measurement of potassium concentration in soil solution
ABSTRACT Despite the growing use of the time domain reflectometry (TDR) technique to monitoring ions in the soil solution, there are few studies that provide insight into measurement error. To overcome this lack of information, a methodology, based on the central limit theorem error, was used to qua...
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Universidade Federal de Campina Grande
2016-04-01
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| Series: | Revista Brasileira de Engenharia Agrícola e Ambiental |
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| author | Isaac de M. Ponciano Jarbas H. de Miranda Richard A. Cooke Vanessa de F. Grah Alisson J. P. da Silva |
| author_facet | Isaac de M. Ponciano Jarbas H. de Miranda Richard A. Cooke Vanessa de F. Grah Alisson J. P. da Silva |
| author_sort | Isaac de M. Ponciano |
| collection | DOAJ |
| description | ABSTRACT Despite the growing use of the time domain reflectometry (TDR) technique to monitoring ions in the soil solution, there are few studies that provide insight into measurement error. To overcome this lack of information, a methodology, based on the central limit theorem error, was used to quantify the uncertainty associated with using the technique to estimate potassium ion concentration in two soil types. Mathematical models based on electrical conductivity and soil moisture derived from TDR readings were used to estimate potassium concentration, and the results were compared to potassium concentration determined by flame spectrophotometry. It was possible to correct for random and systematic errors associated with TDR readings, significantly increasing the accuracy of the potassium estimation methodology. However, a single TDR reading can lead to an error of up to ± 18.84 mg L-1 K+ in soil solution (0 to 3 dS m-1), with a 95.42% degree of confidence, for a loamy sand soil; and an error of up to ± 12.50 mg L-1 of K+ (0 to 2.5 dS m-1) in soil solution, with a 95.06% degree of confidence, for a sandy clay soil. |
| format | Article |
| id | doaj-art-3ae3a0d3c35c44b3a4b135d10bbeb51f |
| institution | OA Journals |
| issn | 1807-1929 |
| language | English |
| publishDate | 2016-04-01 |
| publisher | Universidade Federal de Campina Grande |
| record_format | Article |
| series | Revista Brasileira de Engenharia Agrícola e Ambiental |
| spelling | doaj-art-3ae3a0d3c35c44b3a4b135d10bbeb51f2025-08-20T02:16:22ZengUniversidade Federal de Campina GrandeRevista Brasileira de Engenharia Agrícola e Ambiental1807-19292016-04-0120434334910.1590/1807-1929/agriambi.v20n4p343-349S1415-43662016000400343Metrological assessment of TDR performance for measurement of potassium concentration in soil solutionIsaac de M. PoncianoJarbas H. de MirandaRichard A. CookeVanessa de F. GrahAlisson J. P. da SilvaABSTRACT Despite the growing use of the time domain reflectometry (TDR) technique to monitoring ions in the soil solution, there are few studies that provide insight into measurement error. To overcome this lack of information, a methodology, based on the central limit theorem error, was used to quantify the uncertainty associated with using the technique to estimate potassium ion concentration in two soil types. Mathematical models based on electrical conductivity and soil moisture derived from TDR readings were used to estimate potassium concentration, and the results were compared to potassium concentration determined by flame spectrophotometry. It was possible to correct for random and systematic errors associated with TDR readings, significantly increasing the accuracy of the potassium estimation methodology. However, a single TDR reading can lead to an error of up to ± 18.84 mg L-1 K+ in soil solution (0 to 3 dS m-1), with a 95.42% degree of confidence, for a loamy sand soil; and an error of up to ± 12.50 mg L-1 of K+ (0 to 2.5 dS m-1) in soil solution, with a 95.06% degree of confidence, for a sandy clay soil.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400343&lng=en&tlng=enteorema do limite centralinstrumentaçãocondutividade elétrica |
| spellingShingle | Isaac de M. Ponciano Jarbas H. de Miranda Richard A. Cooke Vanessa de F. Grah Alisson J. P. da Silva Metrological assessment of TDR performance for measurement of potassium concentration in soil solution Revista Brasileira de Engenharia Agrícola e Ambiental teorema do limite central instrumentação condutividade elétrica |
| title | Metrological assessment of TDR performance for measurement of potassium concentration in soil solution |
| title_full | Metrological assessment of TDR performance for measurement of potassium concentration in soil solution |
| title_fullStr | Metrological assessment of TDR performance for measurement of potassium concentration in soil solution |
| title_full_unstemmed | Metrological assessment of TDR performance for measurement of potassium concentration in soil solution |
| title_short | Metrological assessment of TDR performance for measurement of potassium concentration in soil solution |
| title_sort | metrological assessment of tdr performance for measurement of potassium concentration in soil solution |
| topic | teorema do limite central instrumentação condutividade elétrica |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400343&lng=en&tlng=en |
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