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This article in AJ

  1. Vol. 73 No. 4, p. 614-618
    Received: June 5, 1980

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Effects of Nitrogen and Sulfur Fertilizers on Sulfur Content of Tall Fescue and Phalaris1

  1. C. H. Burmester,
  2. Fred Adams and
  3. R. L. Haaland2



In an experiment to determine the effect of N and S fertilizer rates on yield and S uptake by cool-season forage grasses, two cultivars of tall fescue (Festuca arundinacea Schreb.) and one of phalaris (Phalaris aquatica L.) were grown in greenhouse and field experiments on a Cahaba fine sandy loam (Typic Hapludult) at comparable fertility levels. Fertilizer rates in the greenhouse were 38, 75, 125, 175 ppm N and O, 5, 10, 20 ppm S. Nitrogen rates in the field were 85, 170, 280, 390 kg/ha; and S rates were 0, 11, 22, 44 kg/ha. Organic-S content of foliage was about equal in greenhouse and field experiments; it progressively increased with higher N rates but not with S rates. Inorganic-S content was much higher in the green. house experiment,. particularly with phalaris; it progressively decreased with N rates and increased with S rates. Phalaris accumulated potentially toxic levels (to ruminants) of sulfate in the greenhouse but not in the field. Greenhouse-grown plants accumulated much higher levels of S than did field-grown plants, probably because the field soil was able to retain only a portion of the fertilizer sulfate within the rooting zone of the soil profile.

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