Method of exposing agricultural substrates (plant matter 10, animal matter 12) to agrochemicals (A) method of decreasing or preventing sub-surface geological matter (20, 22) contamination resulting from exposing agricultural substrates to agrochemicals composition [(A)/(T)] 30 used therein article-of-manufacture including the composition. Includes exposing agricultural substrates to composition including combination (mixture) of an agrochemical and at least one transforming agent capable of decreasing or eliminating concentration of the agrochemical which contacts sub-surface geological matter (at temporally varying times, and at spatially varying depths). Before entering sub-surface geological matter, transforming agent exhibits inactivity for decreasing agrochemical concentration, and inactivity for affecting or/and interfering with agrochemical functionality with respect to agricultural substrates. Transforming agent co-migrates and is co-distributed with agrochemical within and throughout sub-surface geological matter, and exhibits activity for decreasing or eliminating agrochemical concentration therein. Transforming agent activity is exhibited at spatially varying depths, at temporally varying times, within sub-surface geological matter.Linvention concerne un procédé dexposition de substrats agricoles (matière végétale 10, matière animale 12) à des produits agrochimiques (A) un procédé de diminution ou de prévention de contamination de matière géologique inférieure (20, 22) résultant dune exposition de substrats agricoles à des produits agrochimiques une composition [(A)/(T)] (30) utilisée dans linvention un article manufacturé comprenant la composition. Le procédé consiste à exposer des substrats agricoles à une composition comprenant une combinaison (mélange) dun produit agrochimique et dau moins un agent de transformation pouvant diminuer ou éliminer la concentration du produit agrochimique qui entre en contact avec la matière géologique inférieure (à des m
