Regionalisation of spring triticale in Pomerania in terms of thermic and precipitation conditions

The paper discusses the relations between spring triticale grain yield and weather factors: mean air temperature, total precipitation and insolation in the north-west of Poland. Boundary values were determined for the weather factors such that caused the decrease in grain yield by at least 10% against the many-years yield average. On the basis of weather data from the years 1971-2000, climate indices of spring triticale crop yield were estimated, which in turn provided a basis for the valuation, in terms of scores, of thermic and precipitation conditions in the north-west Poland. Crop yield of spring triticale is markedly restrained by the mean temperature exceeding 16°C in the stalk-shooting coming into ear period, as well as by precipitation below 20 mm over the same period, and by the mean air temperature above 18.5°C in the coming into ear dough stage.