Amaranth Modern Prospects for an Ancient Crop (1984) / Chapter Skim
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'The Plants'
'The Plants'
Pages 14-17
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From page 14... ...
DISTRIBUTION AND ECOLOGY Historically, people have cultivated amaranths in environments ranging from the true tropics to semiarid lands and from sea level to some of the highest farms in the world. Ecotypes have evolved that tolerate alkaline sandy soils with pH as high as 8.5, as well as the acidic clays of hillside slash-and-burn fields of the tropics.
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From page 15... ...
Even when their stomata are partially closed, plants having the C4 pathway are able to maintain relatively high rates of carbon dioxide fixation. Since stomata close when the plant is under environmental stress (such as drought or salinity)
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From page 16... ...
SOIL Field observations indicate that amaranth grows well on soils containing widely varying levels of soil nutrients. Initial studies in Pennsylvania show that young grain amaranth plants grow taller with fertilizer, but the grain yield has thus far shown little improvement.
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From page 17... ...
Grain amaranths have been grown in dry-land agriculture in areas receiving as little as 200 mm of annual precipitation, and, at the other extreme, vegetable amaranths are routinely grown in areas receiving 3,000 mm of annual rainfall. Indeed, in West Africa, vegetable amaranth production continues even during the torrential rainy season.
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