THE IMPACT OF CORN TILLAGE SYSTEM ON THE PROPERTIES OF ORGANIC MATTER IN THE HUMUS HORIZON OF BLACK EARTH (HAPLIC PHAEOZEMS) IN POZNAŃSKI LAKE DISTRICT

The subject of the study was the impact of three different combinations of corn tillage on the properties of organic matter – direct seeding into stubble as a  control, seeding after deep plowing and seeding after application of manure and deep plowing. The experiment included humus horizons in black earth (Haplic Phaozems) in Poznański Lake District in the field of a  ten-year conservation tillage system of corn monoculture. There are no significant differences in the fractionalcomposition of humus one year after the introduction of the specified cultivation system