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Sample Temperature Affects Measurement of Nitrate with a Rapid Analysis Ion Selective Electrode System Used for N Management of Vegetable Crops
dc.contributor.author | Peña-Fleitas, María Teresa | |
dc.contributor.author | Grasso, Rafael | |
dc.contributor.author | Gallardo Pino, Luisa | |
dc.contributor.author | Padilla Ruiz, Francisco Manuel | |
dc.contributor.author | DeSouza, Romina | |
dc.contributor.author | Rodríguez, Alejandra | |
dc.contributor.author | Thompson, Rodney | |
dc.date.accessioned | 2022-12-20T14:22:14Z | |
dc.date.available | 2022-12-20T14:22:14Z | |
dc.date.issued | 2022-11-30 | |
dc.identifier.issn | 2073-4395 | |
dc.identifier.uri | http://hdl.handle.net/10835/14132 | |
dc.description.abstract | The practical value of portable hand-held ion selective electrode sensors (ISE) for on-farm [NO3−] measurement to assist with crop N management of vegetable crops has been demonstrated in numerous previous studies. They provide rapid, in-situ measurement of the nitrate concentration ([NO3−]) in nutrient and soil solutions, and in petiole sap. Sample temperatures, for on-farm measurements, vary appreciably. This study evaluated the effects of sample temperature on [NO3−] measurement using two different models of a commonly used, commercially available, portable ISE meter. The temperatures (5, 10, 15, 20, and 25 °C) examined were in the range likely to be encountered in practical on-farm work. Aqueous solutions of 6, 12, and 18 mmol NO3− L−1 were prepared from KNO3, Ca(NO3)2 and NaNO3. [NO3−] was measured in three replicate samples of each of the three concentrations, made from each NO3− compound, at each temperature. The results consistently and clearly demonstrated a strong negative linear relationship between temperature-induced errors and sample temperatures. The temperature-induced error was considerable for cooled samples, being +50% at 5 °C and +31% at 10 °C. At sample temperatures of 17–20 °C, the temperature effects were minimal. Above this range, the temperature effect caused underestimation. At 25 °C, the temperature-induced error was −24%. These results show that care must be taken to ensure that sample temperatures do not erroneously affect the measurement of [NO3−] with ISE meters. Particular care needs to be taken with both refrigerated and warmer samples. | es_ES |
dc.language.iso | en | es_ES |
dc.publisher | MDPI | es_ES |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | quick tests | es_ES |
dc.subject | ISE | es_ES |
dc.subject | LAQUAtwin | es_ES |
dc.subject | Horiba | es_ES |
dc.subject | N monitoring | es_ES |
dc.subject | nutrient solution | es_ES |
dc.subject | soil solution | es_ES |
dc.subject | petiole sap | es_ES |
dc.subject | fertigation | es_ES |
dc.title | Sample Temperature Affects Measurement of Nitrate with a Rapid Analysis Ion Selective Electrode System Used for N Management of Vegetable Crops | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.relation.publisherversion | https://www.mdpi.com/2073-4395/12/12/3031 | es_ES |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es_ES |
dc.identifier.doi | 10.3390/agronomy12123031 |