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ARS Home » Research » Publications at this Location » Publication #147821
Title: RESPONSE OF HEALTHY AND DISEASED PEANUT PODS TO CALCIUM NUTRITION

Author
item SAUDE, CATARINA - OKLAHOMA STATE UNIV
item Melouk, Hassan
item PAYTON, M - OKLAHOMA STATE UNIV

Submitted to: American Phytopathology Society
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2003
Publication Date: 11/15/2003
Citation: Saude, C., Melouk, H.A., Payton, M. 2003. Response of healthy and diseased peanut pods to calcium nutrition [abstract]. Phytopathology. 93:S76.

Interpretive Summary:

Technical Abstract: Greenhouse grown peanut plants of 'Okrun', a Sclerotium rolfsii-susceptible cultivar, were fertilized with calcium sulfate at two rates (2,272 Kg/ha and 3,409 Kg/ha) at 75 days after planting (DAP). Calcium content in supplemented soil was ~800 ppm, whereas residual calcium was ~450 ppm. Disease was induced by inoculating plants with S. rolfsii at 100 and 120 DAP. At harvest (150 DAP) weight of pods/plants in healthy plants was significantly (P = 0.05) higher than those of diseased plants. Calcium content (%) in hulls of pods from healthy and diseased plants receiving calcium supplementation was about 40% higher than those in the controls. Content of calcium in kernels of healthy pods was similar in calcium and non-calcium supplemented plants; however, calcium content in kernels of diseased pods with calcium supplementation was bout 40% higher than those in the controls. The reason for the increase in calcium in diseased kernels may be due to chelation by oxalic acid produced by the fungus.