Environmental factors influencing pollination activity of Apis mellifera on Brassica campestris

Abstract

The relationship of bee visits to environmental factors was studied by simple and by path coefficient analysis Bee activity was Significantly correlated with air temperature (r == 0·449), light intensity (r = 0·555), solar radiation (r = -0·526), soil temperature (r 0·820), relative humidity (r == - 0·630) and nectar-sugar concentration (r = 0·434). but not with wind velocity (r = a·to O). Direct effects of light intensity (0·619), solar radiation (0·579) and soil temperature (0·304) were positive, while those of other factors were negligible or negative.