Arbuscular mycorrhizas are found in 85% of all plant families, and occur in many crop species.

Their feed on a wide range of grass seeds and will also make use of crop species.

Honeybees can also act as pollinators of crop species.

It is estimated that the Inca cultivated around seventy crop species.

A major criterion is the crop species, since isolation distances often must be calculated according to pollen weight.

This conceptually simple approach has been highly successful in many crop species and numerous breeding programs.

However, it is also toxic to most crop species and is rarely applied as a sole nitrogen source.

Since many important crop species originate outside the United States, the first steps toward diversity are acquisition and introduction.

At least 80% of our world's crop species require pollination to set seed.

Rows are typically about 10-30 cm apart, depending on the crop species and growing conditions.