 |
| Titel |
Nitrogen variability: a constant issue in the field |
| VerfasserIn |
Ana M. Tarquis, Maria Teresa Castellanos Serrano, Maria Carmen Cartagena, Francisco Ribas, Maria José Cabello, Augusto Arce, Nigel R. Bird |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114758
|
| Publikation (Nr.) |
 EGU/EGU2015-15572.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this study we use the relative entropy (E(δ)) 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(δ), 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(δ)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.
References
Castellanos, M. T., Cartagena, M. C., Arce, A., Ribas, F., Cabello, M. J., and
Tarquis, A. M. 2010. Ef?ciency Indexes for melon crop optimization, Agron. J., 102,
716–722.
Lark, R.M., A.E. Milne, T.M. Addiscott, K.W.T. Goulding, C.P. Webster, and S.
O’Flaherty. 2004. Scale- and location-dependent correlation of nitrous oxide emissions with
soil properties: An analysis using wavelets. Eur. J. Soil Sci. 55:611–627.
Milne, A.E., Castellanos, M. T., Cartagena, M. C., Tarquis, A. M. and Lark, R. M. 2010.
Investigating the effect of previous treatments on wheat biomass over multiple spatial
frequencies. Biogeosciences, 7: 2739-2747.
Tarquis, A.M., N.R. Bird, A.P. Whitmore, M.C. Cartagena, and Y. Pachepsky. 2008.
Multiscale analysis of soil transect data. Vadose Zone J. 7: 563-569. |
|
|
|
|
|
|