Extensive crop

A crop that has low production costs and profit margins. Soybeans, maize, and wheat are typical extensive crops in North America. See also: intensive crop. Extinct wild progenitors

Crops whose wild progenitors have been harvested by ancient hunter-gatherers to extinction. The domesticated forms survived because farmers are always careful to preserve propagating material of their crops. But food gatherers are often careless about wild plants and, in the course of a few human generations, they would never notice the decline in numbers that was occurring because of their activities. Among ancient clones, this loss of wild progenitors has occurred with black pepper, garlic, ginger, olive, saffron, and turmeric. Among other crops, a loss of wild progenitors also occurred with apple, broad bean, cassava, chillies, green peas, onions, peanuts, soybean, sweet potato, tea, turmeric and yams . Extinction

The total loss of a species resulting from either natural competition, or the activities of humankind.

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