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This article in AJ

  1. Vol. 59 No. 1, p. 44-47
    Received: Sept 6, 1963

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Yield of Kentucky Bluegrass (Poa pratensis} as a Function of Its Percentage of Nitrogen, Phosphorus, and Potassium1

  1. William M. Walker and
  2. John Pesek2



Kentucky bluegrass clippings were obtained from experimental plots containing a control plus treatments conforming to a 5 × 5 × 5 central composite design with N, P, and K fertilizer variables over a period of 2 years. A sample of each clipping from each plot each year was saved for chemical analysis. The samples were then ground, mixed, subsampled, and analyzed for their percentage of N, P, and K.

A regression analysis was computed, and a prediction equation with bluegrass yield as a quadratic function of its average percent N, percent P, and percent K was determined. The resulting prediction equation had an R2 of 0.7419 and was used to estimate “critical percentages” for N, P, and K in Kentucky bluegrass. The technique developed would be expected to be applicable to other crop and soil conditions.

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