Prediction of P concentrations in soil leachates: Results from 6 long term field trials on soils with a high P load

Résumé

We tested if a single soil P capacity test allows for a reliable forecast of P leaching from agricultural soils with a high P load. In regions with intensively managed arable soils, the soil P content has been dramatically increased by overfertilization with significant P leaching losses as a result. As a consequence, in order to control the P losses, P fertilization has been legally restricted. In several EU28 countries, the ammonium lactate extraction method (P-AL) is used as a soil test for P fertilizer advice, but sometimes also to determine the allowed P fertilizer dose to reduce leaching losses. We hypothesize that P-AL as an estimator of soil P capacity should be combined with 0.01 M CaCl2 extractable P (P-CaCl2) and/or hot water extractable P (HWP), both estimators of the soil P intensity, to predict P leaching losses in soils with a high P load.


Auteurs, date et publication :

Auteurs T. Vanden Nest , B. Vandecasteele , G. Ruysschaert , R. Merckx

Publication : Agriculture, Ecosystems & Environment

Date : 2025

Volume : 237

Pages : 55-65


Catégorie(s)

#INRAE #PRO #PRO QualiAgro