Article (Scientific journals)
A comparison of within-season yield prediction algorithms based on crop model behaviour analysis
Dumont, Benjamin; Basso, Bruno; Leemans, Vincent et al.
2015In Agricultural and Forest Meteorology, 204, p. 10-21
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Keywords :
STICS crop model; Climate variability; LARS-WG; Yield prediction; Log-normal distribution; Central Limit Theorem; Convergence in Law Theorem
Abstract :
[en] The development of methodologies for predicting crop yield, in real-time and in response to different agro-climatic conditions, could help to improve the farm management decision process by providing an analysis of expected yields in relation to the costs of investment in particular practices. Based on the use of crop models, this paper compares the ability of two methodologies to predict wheat yield (Triticum aestivum L.), one based on stochastically generated climatic data and the other on mean climate data. It was shown that the numerical experimental yield distribution could be considered as a log-normal distribution. This function is representative of the overall model behaviour. The lack of statistical differences between the numerical realisations and the logistic curve showed in turn that the Generalised Central Limit Theorem (GCLT) was applicable to our case study. In addition, the predictions obtained using both climatic inputs were found to be similar at the inter and intra-annual time-steps, with the root mean square and normalised deviation values below an acceptable level of 10% in 90% of the climatic situations. The predictive observed lead-times were also similar for both approaches. Given (i) the mathematical formulation of crop models, (ii) the applicability of the CLT and GLTC to the climatic inputs and model outputs, respectively, and (iii) the equivalence of the predictive abilities, it could be concluded that the two methodologies were equally valid in terms of yield prediction. These observations indicated that the Convergence in Law Theorem was applicable in this case study. For purely predictive purposes, the findings favoured an algorithm based on a mean climate approach, which needed far less time (by 300-fold) to run and converge on same predictive lead time than the stochastic approach.
Disciplines :
Computer science
Agriculture & agronomy
Mathematics
Author, co-author :
Dumont, Benjamin  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Basso, Bruno;  Michigan State University, MI, East Lansing, 48824 > Dpt. of Geological sciences
Leemans, Vincent ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Bodson, Bernard ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Destain, Jean-Pierre ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Destain, Marie-France ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Language :
English
Title :
A comparison of within-season yield prediction algorithms based on crop model behaviour analysis
Publication date :
May 2015
Journal title :
Agricultural and Forest Meteorology
ISSN :
0168-1923
eISSN :
1873-2240
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
204
Pages :
10-21
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Suivi en temps réel de l’environnement d’une parcelle agricole par un réseau de micro-capteurs en vue d'optimiser les apports en engrais azotés
Funders :
SPW DG03-DGARNE - Service Public de Wallonie. Direction Générale Opérationnelle Agriculture, Ressources naturelles et Environnement [BE]
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since 05 March 2015

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