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Response of an Al-Tolerant and an Al-Sensitive Genotype to Lime, P, and K on Three Atlantic Coast Flatwoods Soils¹

Aluminum toxicity, calcium deficiency, and a complex of othex unidentified factors contribute to the poor productivity of Atlantic Coast Flatwoods soils that occupy more than I00,000 km² in the southern U.S. Our objective was to investigate the response of aluminum-sensitive ‘Suregrain’ oats (Avena sativa L.) and aluminum-tolerant ‘Starr’ pearl millet [Pennisetum typhoides (Burm. f)] lime, phosphorus, and potassium on Bladen, Leon, and Lakeland soils. Results of a series of pot experiments using four or moxe rates each of dolomitic limestone, monocalcinm phosphate, and potassium chloride were used to calculate response surfaces and yield isoquants. Eightytwo to ninety.five percent of the variation in yield was explained by lime, P, and K variables. Phosphorus was the most critical growth-limiting factor for plant growth and response to P depended on lime and K levels.

Key Words: Acid soil infertility • Al toxicity • Al tolerance • Avena sativa L. • Pennisetum typhoides (Burm. f.)

² Soil Scientist, USDA, Auburn, Ala. (formerly at Fleming, Ga.); Soil Scientist, USDA, Watkinsville, Ga. (formerly at Fleming, Ga.); and Research Investigations Leader, Soil Management, USDA, State College, Miss., respectively.

Received for publication March 13, 1972.