Do different tillage and fertilization methods influence weather risks on potato yield?

The influence of weather variability on potato yi eld was assessed with an aim to address different soil tillage and fertilization re gimes by their weather sensibility. The strong effect of an experimental year on potato yields was proved for the experimental period; the effect of fertilization proved significant only bet ween the highest and the lowest fertilization rates; the effect of tillage tested insignificant. If synthesized statistically over the population (over an untested period of time), significant inte ractions occur between years and tillage/fertilization treatments, verifying that th e effect of both tillage and fertilization is dependent on year-to-year weather differences. Yiel ds of all examined variants were found to be significantly correlated to spring weather - pos itively to temperatures and negatively to precipitation. Negative correlation exists between yields and temperatures summed from emergence to flowering, positive between yields and precipitation from flowering to harvest.