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Photosynthesis in K- and Mg-Deficient Maize (Zea mays L.) Leaves¹

ABSTRACT

Rates of photosynthesis in maize leaves were closely related to K or Mg concentrations in the leaf tissue. The critical concentrations were about 2 mg/g for K and 200 µg/g for Mg on a fresh weight basis. Normal-appearing leaves of K-stressed plants had sharply diminished photosynthesis rates, whereas Mg deficiency affected photosynthesis rates only after the appearance of chlorosis. Apparently Mg deficiency exerted an influence through chlorophyll deterioration while K deficiency decreased stomatal apertures. Application of the deficient nutrient caused marked recovery within 24 hours of K-deficient leaves but not of Mg-deficient leaves.

¹ Presented before Div. S-4, Soil Science Society of America, at Kansas City, Mo., Nov. 17, 1964.

² Associate Soil Scientist and Crop Physiologist, respectively, The Connecticut Agricultural Experiment Station, New Haven.

Received for publication July 6, 1965. Accepted for publication October 19, 1965.