A study was carried out in 1998–2000 in a strict static field experiment at the Educational and Experimental Station in Tomaszkowo. The aim of the experiment was to determine the effect of lealand management and different soil cultivation variants on the sanitary state and yield of some crops. The first experimental factor was lealand management with the use of a mechanical or mechanical and chemical method (with Roundup 360 SL). The second factor was the method of soil preparation for sowing: single tilling + ploughing, single rotary tilling + ploughing, triple rotary tilling, triple tilling. In 1998, Dankowskie Złote cultivar of winter rye, in 1999 Anielka cv. of potato and in 2000 Bogo cv. of winter triticale were cultivated. The mechanical and chemical lealand management favoured the development of stem rust of cereal and grass on rye and the development of foot-rot on winter triticale. Mechanical lealand management was conductive to the development of potato late blight. The lealand management method did not have any effect on the yield of the crops. The method of soil cultivation at the time of the lealand management had an effect on the intensity of crop infection by some pathogens. Triple tilling and triple rotary tilling favoured the development of stem rust of cereal and grass on rye and the development of foot-rot of cereals (foot-rot, cereal rhizoctoniose). Ploughing the soil reduced the occurrence of these diseases. Triple tilling explicitly favoured the development of potato late blight. The soil cultivation method did not have any effect on the rye yield. The highest potato yields were obtained after
triple tilling and single tilling + ploughing. The highest yield of triticale was obtained after single tilling + ploughing and the lowest after triple tilling. There was no correlation between infection intensity and crop yield.