A recent program in western Africa is attempting to introduce a new high-yield variety of rice known as "New Rice for Africa"(NERICA).

American sailors brought new varieties of sweet potato to New Zealand, and these high-yield varieties quickly superseded the original varieties of kūmara.

Rice production, by contrast, expanded after high-yield varieties were introduced in the 1960s.

And they are planting high-yield varieties developed over the last 30 years in Southeast Asia.

The farmers started growing high-yield varieties and changed cropping pattern.

The production of this boro rice, including high-yield varieties, expanded rapidly until the mid-1980s, when production leveled off at just below 4 million tons.

There is little disagreement that the Green Revolution acted to reduce agricultural biodiversity, as it relied on just a few high-yield varieties of each crop.

As gardeners, we can develop that same passion by carefully selecting vegetable, fruit and herb seed that delivers flavour, rather than just the large, high-yield traditional varieties we're all tempted by.

In the field, farmers are abandoning them in favor of the new high-yield varieties.

Cultivation of African rice has been abandoned for the cultivation of high-yield Asian varieties of Oryza sativa.