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On-farm measurement of electrical conductivity for the estimation of ammonium nitrogen concentration in pig slurry

AuthorsYagüe Carrasco, María Rosa ; Quílez Sáez de Viteri, Dolores
rapid method
Issue Date2012
CitationYagüe MR, Quílez D. On-farm measurement of electrical conductivity for the estimation of ammonium nitrogen concentration in pig slurry. Journal of Environmental Quality 41 (3): 893-900 (2012)
AbstractPig (Sus scrofa domesticus) slurry (PS) is commonly applied as fertilizer to agricultural fields. Knowledge of PS nitrogen content is essential for good management, but PS nitrogen content is highly variable not only between farms but also within a farm. Laboratory analysis of animal slurries is often expensive and impractical for routine farmer use. Therefore, when slurry is spread on land its fertilizer value is generally unknown resulting in risk of pollution. In this work, two rapid and suitable for field use, methods for determining PS ammonium-N (NH4 +-N) concentration (Quantofix® and conductimetry) are evaluated. The electrical conductivity of a dilution 1 PS: 9 distilled water (EC1:9) had better results than Quantofix®, did not need reagents and in addition, gave a direct value of NH4 +-N concentrations (range 1.0 - 7.6 kg NH4 +-N m-3). The conductimetry method allows the use of alternative waters with EC < 1.9 dS m-1 for dilution. The method is being introduced to farmers in northeast Spain in order to improve PS management and has been well received due to its low cost and ease of use in practical application.
Description33 Pags., 6 Figs, 5 Tabls. The definitive version is available at: https://www.crops.org/publications/jeq
Publisher version (URL)http://dx.doi.org/10.2134/jeq2011.0352
Appears in Collections:(EEAD) Artículos
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