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Effect of Potassium on the Mineral Constituents of Pearl Millet and Sudangrass¹

The effect of K at O and 672 kg/ha and various combinations of Ca, Mg, and K on the nitrate-N content of pearl millet [Pennisetum typhoides (Burm.) Staph and Hubbard] and sudangrass [Sorghum sudanense (Piper) Staph] was studied. Nitrogen and P were added uniformly on all plots. Pearl millet growth was unaffected by the K treatment in Experiment I, but this treatment increased sudangrass growth. There was no significant growth response to fertility in Experiment II, however, the Ca + Mg + K treatment tended to have the tallest plants. The fertility treatments did not significantly affect the P content of pearl millet. Pearl millet accumulated much higher amounts of nitrate N than did sudangrass. All plots receiving K singly, or in combination with Ca, and/or Mg were significantly higher in nitrate N. Nitrate N was significantly decreased by addition of Mg and by Ca, but to a lesser degree. Drought conditions seemed to intensify the influence of K on increasing forage nitrate N concentrations. Regulation of Mg and K fertility may help lessen the possibility of nitrate toxicity in pearl millet and sudangrass.

Key Words: Nitrate N • Reciprocal Ca • Mg • K relationships

² Graduate Assistant and Associate Professor, Agronomy Department, University of Maryland, College Park, Md. 20742.

Received for publication October 30, 1969.