Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Scale and space dependencies of Nitrogen variability.
Research Areas
  • Mathematics,
  • Natural sciences and health sciences,
  • Earth sciences,
  • Soil science,
  • Agriculture
In this study we use the relative entropy (E(?)) to investigate residual effects on wheat and grain, biomass and nitrogen content, of fertigation treatments applied to a previous crop. The wheat crop covered nine subplots from a previous experiment on melon response to fertigation. Each subplot had previously received a different level of applied nitrogen and plants from the previous melon crop had already taken up the applied nitrogen. Many factors affect these variables, causing it to vary at different scales creating a non uniform distribution. E(?), and their increments between scales, were used to identify the scale at which the variable had a maximum structure and compare with the scaling behavior of the nitrogen applied. The E(?)is particularly appropriate for this because of does not require any prior assumptions to the structure of the data and it is easy to calculate. The results showed that the applied nitrogen through fertirrigation dominated the wheat and grain biomass response as well as nitrogen content of the whole plant; surprisingly grain nitrogen content didn?t show the same structure than the applied nitrogen. At the same time, there was a noticeable structure variation in the biomass and nitrogen content at the smaller scales that correspond to the melon cropping due to uptake of the applied nitrogen by the previous crop. The E(?) and the increments in E(?) help us to detect changes in the scaling behavior of all the variables studied, showing at which scale there is a maximum structure. These results are in agreement with previous studies.
E.G.U. 2012 9th General Assembly.
Viena, Austria
Start Date
End Date
From page
To page
Geophysical Research Abstracts Vol. 14
  • Autor: Ana Maria Tarquis Alfonso (UPM)
  • Autor: M.C. Castellanos
  • Autor: M.C. Cartagena
  • Autor: F. Ribas
  • Autor: M.J. Cabello
  • Autor: A. Arce
  • Autor: N.R.A. Bird
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Automatización en Señal y Comunicaciones (GASC)
  • Centro o Instituto I+D+i: Centro de Estudios e Investigación para la Gestión de Riesgos Agrarios Medioambientales (CEIGRAM)
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)