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Chilean journal of agricultural research

versión On-line ISSN 0718-5839

Resumen

SALAZAR S, Francisco  y  ROSAS U, Marianela. Evaluation of On-Farm Quick Tests on Slurries from Southern Chile Dairy Farms. Chilean J. Agric. Res. [online]. 2012, vol.72, n.3, pp.444-448. ISSN 0718-5839.  http://dx.doi.org/10.4067/S0718-58392012000300021.

Currently in Chile, there is a lack of tools to determine the real-time nutrient contribution of slurries. This study aims to evaluate three quick tests for their accuracy in estimating the total contents of N (TN), P (TP), K (TK), and ammonium-N (N-NH4+) in dairy slurries. The quick tests included the Agros Nova Meter, Quantofix N Volumeter, and a hydrometer. While the Agros and Quantofix meters directly measure the ammonium-N content; the hydrometer indirectly estimates the total content of N, P, and K based on linear relationships with the slurry DM. Samples (73) were collected from dairy farms along Southern Chile (39° to 44° S and 71 to 73° W). Analyses were carried out on laboratory conditions using conventional techniques as well as using each of the quick tests. Results were subjected to straight-line regression analyses. Agros and Quantofix N-NH4+ measurements were accurate (P < 0.01; r2 > 0.80). The hydrometer estimations of TN, TP, and TK were also reliable (P < 0.01). Best results were obtained with P (r2 = 0.87) and N (r2 = 0.79) total contents. To evaluate the kits on-farm and transfer those to dairy producers may constitute a next step towards an efficient management of organic residues in dairy farms in Chile.

Palabras clave : Slurry; organic residue; chemical analysis; nutrients.

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