NLEAP-GIS modeling in a mediterranean region of spain
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Cita bibliográficaDe Paz, J. M., Albert, C., & Delgado, J. A. (2009, June). NLEAP-GIS Modeling in a Mediterranean Region of Spain. In Proceedings of the 16th Nitrogen Workshop Connecting Different Scales of Nitrogen Use in Agriculture, Turin (pp. 515-516).
Several nitrogen (N) models have been developed to assess the effects of management practices on N losses from agricultural systems. These N tools range from very complex N models useful in research to simple N index tools that can be use for a quick assessment of management practices on N losses to the environment (De Paz et al. 2009). It is well-known that measuring the amount of leaching and atmospheric N losses across all landscapecropping system combinations is difficult, so calibration and validation of models are used to obtain estimations of N losses. Some N models can help us to identify hot spots across fields, facilitating the implementation of precise conservation practices in crop production. These models in combination with Geographical Information Systems (GIS) help us to upscale the assessment from plot research to a regional scale. Intensive irrigated agriculture with traditionally high N fertilization dominates the Mediterranean region of Valencian Community. Most of this region was declared a Nitrogen Vulnerable Zone (NVZ) following European directives. The goal of this paper was to use the Nitrogen Losses and Environmental Assessment Package, which has GIS integration capabilities (NLEAP-GIS v4.2) to assess the effects of management on regional N losses. We select a study area located within a NVZ, to evaluate the management practices with NLEAP-GIS. This area, covers 6300 ha, with citrus and vegetables being the main crops grown under drip and surface irrigation. Although soil texture ranges from sandy loam to clayey soil, the area has predominantly heavy-textured clayey soils. Annual rainfall averages 500 mm, is non-uniform and has intensive rain events during autumn. Evapotranspiration (ETo) measured with the Penman-Monteith method is 960 mm