Bees act as pollinators of many crop species such as sunflower, Brassica apple and pear,Keeping beehives in crop fields during flowering period.Increases the frequency of pollination by bees.Since bees visit the flowers in the crop fields often,they collect more nectar and use this nectar to produce additional honey.Thus,keeping beehives in crop fields during flowering season is beneficial both for crop yield and for honey yield.