The effect of different crop rotation on the fungi compound of pea roots (Pisum sative L. )cv. "Fidelia" and their healthiness

Over the years 1991-1993 research was conducted on the effect of three different types of crop rotation (monoculture, 3-year rotation and 5-year rotation) on the fungi compound of pea roots and their healthiness. It was found that I~isarium oxysporum. occured more frequentl~'. F. solani and Rhizoctonia, solani were frequently isolated from plant cultivated in monoculture. On thy contrary in a 5-year rotation fungi belonging to the genus Trichoderma and Gliocladum occerd more frequently. Infestation of roots in monoculture was nearly twice as high as that in crop rotation and the yield was six time lower. In 3-year and 5-year crop rotation difference was not found in the micoflora compound, root rot degree, and seed yield.