Allometric Growth Studies of the Carrot Crop: II. Effects of Cultural Practices and Climatic Environment

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Abstract
A series of experiments showed that in the carrot plant, the ratio of relative growth rates of roots to that of the leaves, reached its maximum at intermediate plant densities, low soil moisture deficits and when root and leaf temperature were both close to 18 °C. Application of soil nutrients had only a minor effect. Defoliation reduced relative root growth, but in a field experiment, the increase in foliage weight subsequent to the least severe defoliation treatments more than compensated for this reduction. A literature survey showed that those factors affecting the parameters of the allometric equation also affected carrot root shape and this inter-relation is attributed to the physical constraints relating surface to volumetric growth.

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