Effect of Apis mellifera on pollinizing effectiveness of Russian alfalfa

It is a effective way to increase the seed yield of alfalfa by using pollinating insect, and for this purpose, the effect of Apis mellifera on alfalfa pollination was studied. The result indicated that the beak length of A. mellifera was 7.2 mm. It visited the flowers from 9:00 every day and the visiting peak period was from 12:00 to 18:00. The suitable temperature for the visiting was from 15 to 25 ℃, and the visiting speed was 30 to 40 flowers per minute. The average number of visited flowers was 19800 to 26 400 flowers per day per head. The effective capacity of A. mellifera to pollinize Russian alfalfa was more than 125 000 heads/hm2 and the maximum seed yield was 1 067.6 kg/hm2.