Szukana fraza: [Abstract = "The problem is the time of influence. It should be remembered that course of these lines is mainly on underground, and visible effects ofdamges are after decay of more deeply rooting plants. In this time soils and their parent materials are in considerable degree chemically and physically altered. The penetrability of soils is gets smaller, electric conductivity enlarges, soil sorption undergoes and ion equilibrium goes violated."]

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