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Influence of Mineral Nutrition on Pigmentation in Sorghum¹

Five sorghumv arieties, ‘Dwarf Yellow ’ milo, KB2 512; ‘Atlas ’ sorgo. FCI 9112; ‘Feterita, ’ SPI 51991; ‘Fargo Straightneck ’ milo, CI 809; and Feterita, KB 2563 were grown in nutrient and cultures with nitrogen levels from 0.01 to 2.0, in five steps in the phosphorus series and four steps in the potassium series. The amount of purple pigmentation in the five sorghum varieties was influenced by both phosphorus and nitrogen. This feature does thus not serve correctly as a deficiency indicator for phosphorus at low nitrogen levels. These varieties also differed widely in the amount of pigmentation produced at comparable nutrient levels.

Key Words: phosphorous • potassium • nitrogen • red coloring

² Formerly Agronomist, Agency for International Development, and Leader, Epidemiology Investigations, Crops Research Division, ARS, USDA.

Received for publication February 5, 1968.