A decision support system (GesCoN) for managing fertigation in open field vegetable crops. Part I-methodological approach and description of the software.

摘要: Reduced water availability and environmental pollution caused by nitrogen (N) losses have increased the need for rational management of irrigation N fertilization in horticultural systems. Decision support systems (DSS) could be powerful tools to assist farmers improve efficiency. Currently, drip system (fertigation) is used many vegetable crops around world. The paper illustrates theoretical basis, methodological approach structure a DSS called GesCoN fertigation open field crops. based on daily balance, considering lost evapotranspiration (ET) content aerial part crop (N uptake) as subtraction wet soil volume most effected roots positive part. For reference ET can estimated using Penman–Monteith (PM) or Priestley–Taylor Hargreaves models, specifically calibrated under local conditions. Both single dual Kc calculate ET. Rain runoff deep percolation are considered effective rainfall. affected roots, emitters their interactions modeled. Crop growth modeled non-linear logistic function basis thermal time, but model takes into account stresses allows an in-season calibration through dynamic adaptation rate specific genetic demand related DM accumulation critical curve. mineralization from organic matter estimated. helps users evaluate amount fertilizer that has applied order fulfill N-crop requirements achieve maximum potential yield, while reducing risk nitrate outflows.