Resumo

REUSSI CALVO, Nahuel Ignacio et al. Nitrógeno Incubado En Anaerobiosis Y Carbono Orgánico En Suelos Agrícolas De Buenos Aires. Cienc. suelo [online]. 2014, vol.32, n.2, pp.189-196. ISSN 1850-2067.

Organic carbon (CO) and anaerobically incubated nitrogen (Nan) are soil quality indicators. In addition, Nan is an estimator of nitrogen (N) supplied by organic matter mineralization, and has been used to adjust crop N fertilization rates. The aims of this study were: 1) to survey and map total CO (COT) and Nan contents in cropped soils of Buenos Aires province, and 2) evaluate the relationship between those variables at a regional scale. A total of 31.776 and 6556 soil samples taken at 0-20 cm-soil depths were used for COT and Nan, respectively. Prediction efficiencies were 79% for COT and 67% for Nan. COT content varied between 3.5 and 80.8 g kg^-1, increasing from northwest to southeast of Buenos Aires. Nan concentration ranged from 12 to 260 mg kg^-1, the highest values corresponding to the eastern areas decreasing to the west. This evidences the different soil N supply potential, which should be taken into account to adjust crop N fertilization rates. A significant relationship between COT and Nan (R² = 50%) was found at the regional scale. However, the estimation of Nan content using COT would not be a recommendable procedure to diagnose N fertility. However, the maps and relationships could be used for a preliminary approach to N fertility diagnostics at the regional scale and as indicative at the field scale.

Palavras-chave : Nitrogen mineralization, soil health indicators, soil properties maps, cropping.

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