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The positive effects of biochar on soil structure were demonstrated in many studies. Substantially less, even information on the interrelationships between Al, Fe forms and soil structure induced by biochar application as well as its re-application is still absent. Therefore the aims of this study were: (1.) to evaluate the changes in soil structure parameters affected by biochar application and its re-application in different rates (0, 10 and 20 t ha-1), (2.) to evaluate the effect of biochar application and re-a...