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Agriscientia
versão On-line ISSN 1668-298X
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BENINTENDE, M.C. et al. Soil Nitrogen supply capacity: an estimation model. Agriscientia [online]. 2007, vol.24, n.2, pp.97-101. ISSN 1668-298X.
Long term aerobic incubations allow estimation of nitrogen mineralization potential of soils (N0), but is a time consuming technique. Anaerobic incubation (N-AI) is a short time consumer alternative, which also allows predicting the nitrogen nutrient mineralization capacity. The objectives were: a) to establish the association degree and the relationship between N0 and N-AI obtained from some soils of Entre Ríos, Argentina, and b) to check the generated model using a different group of data to establish the possibility to use the model as an estimator of the potential mineralization capacity. We found a positive correlation between N0 and N-AI (r = 0.86 **). The lineal model adjusted to estimate N0 from N mineralized in anaerobic incubations (NMP-AI) was 1.131 N-AI + 55.28 (R2= 0.74). The differences between N0 and NMP-AI were 10%. The difference represented 4 to 10 kg N ha-1 for N mineralized in field conditions. We concluded that N-AI allow showing differences among different soils and managements and can be used as a simple and rapid technique to estimate N0.
Palavras-chave : Nitrogen fertility; Diagnostic; Mineralized N; Anaerobic incubation.