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This article in AJ

  1. Vol. 69 No. 3, p. 514-517
     
    Received: June 12, 1976
    Published: May, 1977


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doi:10.2134/agronj1977.00021962006900030045x

Economic Optima and Price Sensitivity of N Fertilization for Six Perennial Grasses1

  1. Dale Colyer,
  2. F. L. Alt,
  3. J. A. Balasko,
  4. P. R. Henderlong,
  5. G. A. Jung and
  6. Vinh Thang2

Abstract

Abstract

Prices of both nitrogen fertilizers and forages have increased in recent years causing concern about the profitability of fertilizing forage grasses. Yield response functions, which permit computation of economic optima, were estimated using regression analysis for Kentucky bluegrass (Poa pratensis L.), tall fescue (Festuca arundinacea Schreb.) orchardgrass (Dactylis glomerata L.), reed canarygrass (Phalaris arundinacea L), smooth bromegrass (Bromus inermis Leyss.), and timothy (Phleum pratense L.). Experimental data from 3 years, 1968, 1969, 1970, with N treatments of 0, 112, 224, and 448 kg/ha were used to estimate the regression equations. Economic analyses were made with 3 N prices, 44, 55, and 66 cents/kg, and 5 forage prices, 2.2, 3.3, 4.4, 5.5, and 6.6 cents/kg. The economically optimal N treatment varied by species and was sensitive to changes in N-forage price ratio, declining as the N price rose or the forage price declined. Fertilization with N was found to be profitable for all but very unfavorable price ratios.

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