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This article in CS

  1. Vol. 21 No. 4, p. 531-536
    Received: Mar 7, 1980



The Fate of Nitrogen Fertilizer Applied to Turfgrass1

  1. J. L. Starr2 and
  2. H. C. DeRoo3



Field plots, instrumented with suction lysimeter and neutron probe access pipes, were used to study the fate of nitrogenous fertilizer applied to turfgrass grown on a sandy loam soil. Fertilizer N was applied to each plot at a rate of 195 kg ha−1 in each of the first 2 years and 180 kg ha −1 in the 3rd year to each plot. The fertilizer N was in a 50:50 split application in May and September of each year. Grass clippings were returned, after subsampling, to two of the four plots. In the 3rd year, the use of 15N as a tracer in conjunction with grass clipping management provided the means to quantify the N in the grass derived from fertilizer, soil, the current year's grass clippings, and the previous 2 years of grass clippings. For example, where clippings were not returned, about equal quantities of N were derived from soil and fertilizer. Where clippings were returned, the yield of grass increased by about one-third and nearly equal proportions of N in the plant tissue came from soil, fertilizer, and grass clippings.

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