Poster (Scientific congresses and symposiums)
Prediction of stock and fate of phosphorus forms according to soil classification
Renneson, Malorie; Barbieux, Sophie; Dufey, Joseph et al.
2014Phosphorus in Soils and Plants - 5th International Symposium
 

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Keywords :
phosphorus; stock; parent material
Abstract :
[en] Wallonia presents a high diversity of soils and the fate of P in the soil-plant systems can highly vary from one region to another. The fate of phosphorus depends upon its forms in the solid constituents of soils, which is seldom characterized. For example, total P determines the soil reserve of P but also the potential P content which can be lost to surface water by erosion but analysis of this parameter is time consuming and rarely performed. This study aims (i) to define functional groups of soils for a differentiate P management, (ii) to estimate total soil P by regression equations based on soil parameters, and (iii) to estimate the quality of these predictions. The study consists in a characterization of 12 parent materials in Wallonia, collected across different land uses. A classification of soils was defined by clustering analysis and 5 groups were defined according to P contents and forms. Using this information in regression improved the quality of predictions. The coefficients of determination vary from 0.83 to 0.99, in comparison to a coefficient of 0.77 for the global regression. Then, pedotransfer functions were validated with an independent external dataset of 55 soils. Estimation of the quality of the prediction of P content (mean error, standard deviation of prediction and root mean square error) was made with global and local regression models. In conclusion, using a soil classification allowed to improve P content assessment by specific regressions and to propose differentiated P management for each group of soils.
Disciplines :
Earth sciences & physical geography
Agriculture & agronomy
Author, co-author :
Renneson, Malorie ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Barbieux, Sophie ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Dufey, Joseph
Cobert, Florian ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Colinet, Gilles  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Language :
English
Title :
Prediction of stock and fate of phosphorus forms according to soil classification
Publication date :
August 2014
Number of pages :
A0
Event name :
Phosphorus in Soils and Plants - 5th International Symposium
Event place :
Montpellier, France
Event date :
du 26 août 2014 au 29 août 2014
Audience :
International
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 17 December 2014

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