Graduate Thesis Or Dissertation
 

The influence of antitranspirant and calcium sprays on calcium distribution and tipburn in cabbage (Brassica oleracea var. capitata) and lettuce (Lactuca sativa L.)

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  • Tipburn is a widespread physiological disorder of cabbage and lettuce, caused by calcium deficiency. Symptoms of tipburn are necrosis on margins of outer and inner head leaves in lettuce, whereas in cabbage it is only on margins of inner leaves. Tipburn on outer leaves may develop early, but symptoms remain the same until harvest. Tipburn is more serious when it occurs on the inner leaves as heads approach maturity. In search of tipburn control, foliar calcium (Ca(N0₃)₂ and CaCl₂) sprays were applied to the entire leaves to increase calcium content, and foliar Folicote antitranspirant spray was applied to outer frame leaves to reduce transpiration, stimulate root pressure flow and increase movement of calcium to inner leaves. Foliar sprays of antitranspirant, calcium, and combined sprays of antitranspirant and calcium resulted in a degree of tipburn control and in an increase in calcium content of inner leaves, but failed to adequately control tipburn. Most effective was a combined spray of antitranspirant and CaCl₂, next were CaCl₂, combined spray of antitranspirant and Ca(N0₃), then antitranspirant alone and least effective was Ca(N0₃)₂. Foliar sprays of antitranspirant, calcium, and combined sprays of antitranspirant and calcium resulted in slightly higher head temperatures in cabbage and lettuce, and a tendency to increase uptake of some mineral elements such as K, P, Mg, and B.
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