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The field research was performed in the years 2004–2007, at the Mochelek Experimental Station (53°13' N, 17°51' E) near Bydgoszcz on good rye complex. The aim of the study was to compare the effect of chemical control (without protection, herbicide, herbicide + fungicide), the mineral fertilisation (147 and 221 kg/ha NPK) and the sowing density (400 and 600 grains/m) on the occurrence of diseases in winter wheat cv. Tonacja, grown in short-term monoculture. A tendency of an increase in the symptoms severity of tan spot (Pyrenophora tritici-repentis) intensity and decrease of leaf blotch (Mycosphaerella graminicola) occurrence was noted in the successive wheat growing years in a short-term monoculture. A significant effect of the studied factors was registered and disease severity was dependent on the pesticide treatments. The fewest disease symptoms were recorded after fungicide (flusilazole + carbendazim) and herbicide (iodosulfuron-methyl-sodium) application. The herbicide (iodosulfuron-methyl-sodium) application resulted in increase of disease occurrence, especially leaf blotch and glume blotch (Phaeosphaeria nodorum). Much more symptoms of leaf blotch and powdery mildew (Blumeria graminis) were observed at a higher sowing density. Fewer symptoms of diseases were observed at a lower NPK rate.

Effect of fertilization, chemical crop protection and sowing density on health status of winter wheat grown in short-time monoculture on light soil