Key Points
- Similar levels of pollination occurred regardless of whether bees were collecting nectar or pollen.
- Bees might visit only one or two florets per flower if nectar levels are low.
- Up to one-third of flowers visited by bees failed to produce any seed.
- At least two hives per hectare are needed to provide sufficient bees for effective pollination.
- The low number of seeds per floret appears to be one of the main factors limiting seed yields.