Abstract

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 N_0.

Keywords : Nitrogen fertility; Diagnostic; Mineralized N; Anaerobic incubation.

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