Status and evolution of P,K, and Mg content in french arable topsoil data

Version 1 of this dataset hold the selected results of a spatio temporal analysis of soil nutriment status. This work is based on more than 2 millions topsoil samples in France over a 25 year period since 1990. The results are aggregated at administrative levels so called canton and small agricultural region. The dataset provide the results of the statistical algorithm which aimed to test the possible trend in P K Mg soil test values before and after 2004. We ran the algorithm on the raw data (content in exchangeable P , K and Mg) and on the interpreted values in relation to the agronomic diagnosis. This diagnosis evaluates the necessity of fertilising the crops to allow farmers to achieve their potential yield, according to the soil status characterised by the soil test.