translate English to French: When TSP or TSP + SPM were applied 1 week before urea application, ureolysis was further retarded, but this had little additional effect on the reduction of volatile ammonia losses.
L'application de TSP ou de TSP + SPM 1 semaine avant l'addition d'urée a accentué le ralentissement de la vitesse d'uréolyse sans pour autant modifier significativement la volatilisation ammoniacale.