Revista de la ciencia del suelo y nutrición vegetal
versión On-line ISSN 0718-2791
ALFARO V, Marta et al. NITROGEN LEACHING LOSSES ON A VOLCANIC ASH SOIL AS AFFECTED BY THE SOURCE OF FERTILISER . R.C. Suelo Nutr. Veg. [online]. 2006, vol.6, n.2, pp. 54-63. ISSN 0718-2791. http://dx.doi.org/10.4067/S0718-27912006000200005.
An intact lysimeters study was carried out to measure the potential nitrogen (N) losses on an andisoil of Southern Chile with different fertilisers. The treatments tested were: fish slurry (FS), dairy slurry (DS), potassium nitrate (IF) and a control treatment (C), with no N addition. An equivalent amount of 150 kg of total N ha-1 was applied to each lysimeter and then the equivalent to 1260 mm of rainfall was irrigated over a 90 days period. Leachate samples were analysed for nitrate, nitrite, ammonia and organic N (No). Total N losses were calculated as the product between drainage and the respective N concentration in the leachates. Lowest N losses were obtained in the control and FS treatments (66 kg N ha-1) and the greatest amount was obtained in the IF treatment (261 kg N ha-1). Nitrogen was mainly lost as nitrate and No (each was 49% of the total N losses). High soil organic matter of andisoils can be more relevant than fertiliser for N leaching losses.
Palabras llave : fish sludge; dairy slurry; inorganic fertilizer; water quality.