Abstract
Measurements were made of the shape and size of roots of the carrot varieties Amsterdam Forcing and Autumn King. The roots changed during growth from a near conical to a more cylindrical shape. The change was especially rapid in the first half of the growing period. In both varieties, plant density influenced the change in shape with age. Thus in young carrots, cylindricality was associated with high plant density, whereas in older carrots it was associated with low plant density. With at least the lower densities of Amsterdam Forcing the range in root length for a given range in root diameter increased at first, later becoming constant. For roots of a given age, increasing plant density was accompanied by a decrease in the range of root lengths for a given range in diameter. Relationships between root shape and certain biochemical constituents are discussed on the basis of data presented by Barnes (1936). It is concluded that plant density as well as age can influence carrot root shape so much as to make unsuitable a variety normally suited to a particular requirement.
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