Abstract
The yield of roots of two varieties of long red beet (Cheltenham Green Top and Covent Garden Red) was found to be similar despite a considerable difference in the total leaf area per plant throughout the growing season. The foliage of Cheltenham Green Top appeared wilted on most days during the latter half of the growing period, yet the stomata were found to be open when maximum assimilation rates would be expected. After wilting of Cheltenham Green Top was first seen, net assimilation rates (E) of this variety were greater than those of Covent Garden Red, which would account for the similarity in root weights. The difference in E between the varieties was, therefore, attributed to differences in leaf area index but, as the angle at which leaves were held to incident radiation changed markedly as Cheltenham Green Top aged, it was considered that this might havfe also influenced E.
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