The purpose of the research was to characterize the variability of relative air humidity in the growing season in the vicinity of Bydgoszcz in the years 1985-2010. The study was based on measurements taken from a representative meteorological station located within the Airport Bydgoszcz-Szwederowo. Standardized air humidity measurements were carried out in a thermometer shelter, by Assmann psychrometer at the height of 2 m above the ground, on the plateau, about 3.5 km from the city center. The study investigated the nature and scope of changes in mean relative humidity by calculating selected elements of descriptive statistics. Based on the linear function of Regression analysis we determined direction of changes and specified the ratio with time of analyzed indicator. The average relative air humidity in the Bydgoszcz vicinity, especially in the spring and summer months, was characterized by a large temporal variability, appropriate to moderate and transitional climate in Poland. The variability of the analyzed indicator in multi-year period 1985-2010 was not statistically confirmed. It was found a temporary widening of variation in 5 of the 7 examined cases in period 1998-2010 compared to the previous period 1985-1997. ...
The aim of the study was to assess the rainfall deficits on two- and three-cut meadows the meadows in the vicinity of Bydgoszcz. The research was based on 34-year meteorological data gained from observations made in the years 1981-2014 at the Research Centre of the University University of Science and Technology in Bydgoszcz, located in the village of Mochle, about 20 km from the city center. When assessing the local agroclimate, we used average monthly air temperature and monthly precipitation totals. Calculated for the meadows rainfall deficits and surpluses allowed to estimate the moisture conditions during the growth of the sward on two- and three-cut meadows. The average rainfall total in the growing season is 313 mm and meets the needs of meadow sward at 73%. On the two-cut meadows the largest rainfall deficit occurred during the accumulation of the first regrowth of sward, and on the three-cut meadows in the second regrowth. On the basis of the ratio of the relative precipitation index RPI it was found that at the average rainfall deficit of 113 mm the frequency of occurrence in the category of years was for normal 29.4%, dry 32.4, and wet 38.2%. Rainfall deficits present in ...
