Summary: The authors describe on the basis of Hajósy's rainfall map and Stefanovits's soil map the territorial distribution of sand bog, alkali and acid soils needing amelioration among the agriculturally used areas of Hungary in connection with the territorial distribution of rainfall.

The paper reports on the authors' attempts at soil amelioration in the course of which artificial materials, polyelectrolites, artificial material foams, and emulsions were introduced into the soil. On the basis of their experiments the authors think that in the future the use of artificial materials will play a great role in soil amelioration.

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