Abstract
AbstractPearl 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.
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