It is known, that the trees, when grow in the forest, carried out of the soil more than 60 chemical elements. Among them, such as Сalcium, which prevents the acidification of the soil. In contrast to agricultural systems, forest systems are not fertilized. Therefore, roots secrete acids, which destroying soil minerals and thereby forming mineral nutrients. It is also known, that trees, unlike herbs, used NH4+, highlighting equivalent ion H+ to soil. Ukrainian scientist prof. Ivan Gogolev showed, that during 60 years coniferous forest per 1 hectare allocates acids, the number of which is equivalent to 12 tons of concentrated sulfuric acid. Can we consider this trees of acid aggressors?