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Photosynthesis of, and ¹⁴CO₂-Photosynthate Translocation from, Calcium-deficient Leaves of Crops¹

Limited information is available on the role of Ca in net photosynthesis (Pn) and ¹⁴C translocation. This research was done to determine the influence of the removal of Ca supply from 2-month old soybean (Glycine max (L) Merr. ‘Hampton 266A’), peanut (Arachis hypogaea L. ‘Florunner’), and cotton (Gossypium hirsutum L. ‘Goker 310’) plants on Pn, ¹⁴C translocation, and Ca concentration. Removal of Ca from the nutrient solution did not influence Pn of any of the species until Ca dificiency was visible in the measured leaf. Critical levels of total Ca on Pn were near 0.3% but acetic acid extractable Ca was 0.09 to 0.23% indicating that Ca requirements for Pn may be in micronutrient amounts. Short-term translocation of ¹⁴C from Ca-deficient leaves was 36% higher for peanut and 56 and 31% lower for soybean and cotton, respectively, compared to plants of the same species supplied with Ca.

Key Words: Soybean • Glycine max • Peanut • Arachis hypogaea • Cotton • Gossypium hirsutum • Ca nutrition • Critical Ca level

² Assistant professor of agronomy, Georgia Station, Experiment, GA 30212; professor and associate professor of agronomy, College Station, Athens, GA 30602; professor and head, Dep. of Horticulture, College Station, Athens, GA 30602.

Received for publication March 21, 1975.