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Journal of soil science and plant nutrition

versão On-line ISSN 0718-9516

Resumo

MARTINEZ-LAGOS, J et al. Nitrogen orgdiv2mineralization in a silandic andosol fertilized with dairy slurry and urea. J. Soil Sci. Plant Nutr. [online]. 2015, vol.15, n.1, pp.60-75.  Epub 24-Fev-2014. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162015005000006.

Knowledge about the size and cycle of inorganic N pool on grasslands is necessary to develop adequate fertilization strategies and to determine the potential pathways of N losses. The objectives of this study were to: 1) quantify the N mineralization rates in permanent grassland on an Andosol of southern Chile; and 2) determine the effect of high N application rates as urea and dairy slurry on this process. Mineralization was measured over a three years period on grassland fertilized with 400 kg N ha-1 yr-1 by acetylene inhibition method, incubating soil cores under field conditions. Subsequently, a laboratory assay was carried out to determine potential residual N mineralization rate by anaerobic incubation method. Higher N mineralization was measured on the urea treated plots (314 - 420 kg NH4+-N ha-1 yr-1) followed by slurry (320 - 344 kg NH4+-N ha-1 yr-1) (p<0.05). Most of the N was mineralized during spring and summer seasons (p<0.05). Laboratory results indicate that slurry treated soil had greater net potential N mineralization rates than urea (p<0.05). Results suggest that in Andosols of southern Chile, N mineralization can be a major N input into the soil N budget, with implications for grassland fertilizer managements and pathways of N loss

Palavras-chave : Nitrogen; mineralization; grassland; slurry; urea; Andosol.

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