The aim of the research was comparison of the effect of plough tillage and conservation tillage with the use of various catch crops on the yield and grain quality of spring wheat sown in monoculture on rendzina soil. The experiment was set up on rendzina soil with split-plot design in four replications and included plough tillage (A) and conservation tillage, conducted with two methods: with autumn disking of catch crops (B) and with their spring disking (C). At the same time, four methods of regenerating plot in monoculture of spring wheat were conducted in a form of undersown red clover and Dutch ryegrass, as well as catch crops of lacy phacelia and white mustard. The control were plots without catch crops. Plough tillage was favorable for obtaining higher ear density and grain number per ear, which consequently affected increase in the yield of spring wheat grain, compared with conservation tillage. Decrease in the yield of spring wheat grain on plots with conservation tillage, to the highest degree resulted from a decreased ear density. Ear number and grain yield obtained from the plots where stubble catch crops were sown as well as red clover, were significantly higher than on plots after undersown Dutch ryegrass and on the control plots. Better yield of spring wheat on a plot after stubble catch crops and undersown red clover, to a high degree resulted from an increased ear number per unit of area. Tillage systems as well as catch crops did not change significantly 1000 grain weight of spring wheat. Degree of infestation of the spring wheat culm and root with a complex of fungal diseases was not altered by the evaluated tillage systems. Disease index determined for spring wheat on plots after undersown red clover and stubble catch crops as lacy phacelia and white mustard was significantly lower than after undersown Dutch ryegrass and in control without catch crops. The content of total protein and gluten in spring wheat grain as well as sedimentation coefficient did not change under the effect of the applied tillage systems. Application of Dutch ryegrass as a catch crop deteriorated the quality of spring wheat grain.

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