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One of the greatest needs in both research and practical crop production is a method for measuring instantaneous plant growth. If we could go out in the field and make simple rapid measurements of plant growth rates, the application and benefits would be immediate and far reaching. The instantaneous growth rate is characterized by the carbon balance of a plant or crop. Some years ago Terry (9) and some of his associates made detailed studies of CO? exchange parameters of beet leaves effected by nutrient deficiencies. Under carefully controlled conditions he found changes that developed in the very early stages of nutrient stress. Following this lead I attempted to make a practical application on sugarbeets (Beta vulgaris L.) growing under real field conditions (1). The objective was not accomplished because variation in CO? exchange was greater from leaf to leaf than the changes brought on by the initiation of stress. The data and results reported here come from additional studies using field-grown sugarbeet leaves. The objective was to pinpoint the fundamental differences in the leaves that lead to the large variability in CO? assimilation from leaf to leaf.

Photosynthesis and Environmental Stress Interactions in Sugarbeet Leaves