Simulación de las pérdidas de nitratos por lixiviación en fertilizaciones nitrogenadas en cultivos de maíz. Nitrógeno residual y acumulado por el maíz en fertilización uniforme y variable según zonas de manejo.

MUSCHIETTI PIANA, M.P.; CIPRIOTTI, P.A.; URRICARIET, S.

San Fernando del Valle de Catamarca

Congreso; Congreso Iberoamericano de Calidad de Vida y de Medioambiente,; 2010

NLEAP model (Nitrate Leaching and Economic Analysis Package) was developed for a rapid and accurate estimation of potential nitrate leaching lossess moving below the root zone, associated with agricultural practices. The objective was to assess the potential nitrate leaching losses in nitrogen fertilized corn crop (Zea Mays L.) with uniform and site-specific nitrogen technologies, simulated with NLEAP model. Soil nitrate-nitrogen (N-NO3-) content was determined after harvest in field experiments (0-1,5 m depth) with uniform and site-specific nitrogen fertilization. The residual nitrate content and potential losses (> 1,5 m depth) were simulated with NLEAP, and were compared with experimental data. Simulated residual soil nitrate showed a high correlation with the observed values, suggesting that NLEAP was capable to predict soil nitrate leaching under the studied conditions. In maize low-productivity zone, resource conservation was improved with site-specific N fertilization by reducing residual soil nitrate content that would be leached during a rainy season.