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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 Fusarium oxysporum, occured more frequently. 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 Gliocladium 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.
Analysis of the effect of meteorological factors on the yielding of pea cv. Fidelia was conducted for the period of 1986-2005. The source material concerning the yields and the weather conditions originated from three experimental and meteorological stations situated in northern and eastern Poland. In the study the method of multiple regressions was applied, with the use of linear and quadratic functions with stepwise selection of variables, and the created regression equations were evaluated by means of the coefficient of determination R2, adjusted R2 adj and the Cross Validation procedure – R2 pred, as well as the F-Snedecor test. In the years of the study notable variation was observed in the weather factors in the individual stages of growth of pea, which had a significant effect on the times of their beginning, on the duration of the growth stages, and on the level of yields. The effect of the meteorological factors studied, i.e. solar radiation, air temperature and atmospheric precipitations on the yielding of the pea cultivar was related to the location of the station, stage of advancement of vegetation, and on the set of variables adopted for the analyses.
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