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The paper presents the findings of 6-year (1993–1998) investigations obtained in the field static experiment continued since 1967. This experiment concerned the estimation of the crop yield and its structure, and root technological quality under the conditions of crop rotation and extreme shortening of the rotation, i.e. monoculture. Investigations have proved that under agroclimatic conditions of north-eastern Poland it is possible to obtain 60 t of roots per ha in a naturallydoi:10.17221/4395-pse fatcat:nyi3afpku5f4vockghyllvejbq