Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1968
Published in Agron J 60:38-40 (1968)
© 1968 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Soil Nutrients and pH on Nitrate Nitrogen and Growth of Pearl Millet [Pennisetum typhoides (Burm.) Staph and Hubbard] and Sudangrass [Sorghum sudanense (Piper) Staph]1

D. T. Smith and N. A. Clark2

Pearl millet [Pennisetum typhoides (Burm.) Staph and Hubbard] and sudangrass [Sorghum sudanense (Piper) Staph] were compared in 1963 on a mineral-deficient, low pH Monmouth sandy loam under four rates each of K and P, and three rates each of Ca and Mg with one element varied per plot. In 1964, pearl millet was grown on a Sassafras sandy loam under three pH levels and four potassium levels. A greenhouse experiment was conducted the following winter with pearl millet grown in soil from the low-K plots of the first experiment. Treatments were three pH levels and four K levels. Plant samples from each experiment were chemically analyzed. Although K fertilization had no effect on nitrate N in sudangrass, nitrate N in pearl millet tended to incrtase with K applications. Concentrations of 3 to 6% K in plant tissue were common. P and Mg fertilization showed no effect on nitrate N concentrations in plant tissue. Nitrate in millet increased with soil pH increases. Millet was less sensitive to soil fertility than sudangrass was and extracted greater amounts of N, P, and K.

Key Words: summer annuals • soil fertility

1 Contribution No. 3928 and Scientific Article No. A-1355 of the Maryland Agricultural Experiment Station, Department of Agronomy, submitted by the senior author in partial fulfillment of requirements for the M.S. degree.

2 Formerly Graduate Assistant (now Graduate Assistant, Crop Science Department, Michigan State University, East Lansing) and Associate Professor, Agronomy Department, University of Maryland, College Park, Md.

Received for publication May 12, 1967.




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Environmental Quality		 The Plant Genome
Copyright © 1968 by the American Society of Agronomy.