Calibration of WAVE in irrigated maize: fallow vs. cover crops.

Gabriel Pérez, José Luis and Quemada Saenz-Badillos, Miguel and Vansteenkiste, J. and Diels, J. and Vanclooster, M. (2013). Calibration of WAVE in irrigated maize: fallow vs. cover crops.. "Procedia Environmental Sciences", v. 19 ; pp. 785-793. ISSN 1878-0296.


Title: Calibration of WAVE in irrigated maize: fallow vs. cover crops.
  • Gabriel Pérez, José Luis
  • Quemada Saenz-Badillos, Miguel
  • Vansteenkiste, J.
  • Diels, J.
  • Vanclooster, M.
Item Type: Article
Título de Revista/Publicación: Procedia Environmental Sciences
Date: June 2013
ISSN: 1878-0296
Volume: 19
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Producción Vegetal: Fitotecnia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Nitrate leaching decreases crop available N and increases water contamination. Replacing fallow by cover crops (CC) is an alternative to reduce nitrate contamination, because it reduces overall drainage and soil mineral N accumulation. A study of the soil N and nitrate leaching was conducted during 5 years in a semi-arid irrigated agricultural area of Central Spain. Three treatments were studied during the intercropping period of maize (Zea mays L.): barley (Hordeum vulgare L.), vetch (Vicia villosa L.), and fallow. Cover crops, sown in October, were killed by glyphosate application in March, allowing direct seeding of maize in April. All treatments were irrigated and fertilised following the same procedure. Soil water content was measured using capacity probes. Soil Nmin accumulation was determined along the soil profile before sowing and after harvesting maize. Soil analysis was conducted at six depths every 0.20m in each plot in samples from 0 to 1.2-m depth. The mechanistic water balance model WAVE was applied in order to calculate drainage and plant growth of the different treatments, and apply them to the N balance. We evaluated the water balance of this model using the daily soil water content measurements of this field trial. A new Matlab version of the model was evaluated as well. In this new version improvements were made in the solute transport module and crop module. In addition, this new version is more compatible with external modules for data processing, inverse calibration and uncertainty analysis than the previous Fortran version. The model showed that drainage during the irrigated period was minimized in all treatments, because irrigation water was adjusted to crop needs, leading to nitrate accumulation on the upper layers after maize harvest. Then, during the intercrop period, most of the nitrate leaching occurred. Cover crops usually led to a shorter drainage period, lower drainage water amount and lower nitrate leaching than the treatment with fallow. These effects resulted in larger nitrate accumulation in the upper layers of the soil after CC treatments.

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Item ID: 25857
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Deposited by: Memoria Investigacion
Deposited on: 16 Jun 2014 14:34
Last Modified: 22 Sep 2014 11:38
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