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This article in SSSAJ

  1. Vol. 20 No. 1, p. 66-68
    Received: Dec 8, 1954

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The Effect of Various Rates and Frequencies of Application of Rock and Superphosphate on the Yield and Composition of Forage on a Lake Charles Clay Loam Soil1

  1. R. L. Cheaney,
  2. Ralph M. Weihing and
  3. R. Norton Ford2



The effects of various rates and frequencies of application of rock and superphosphate on the yield and chemical composition of pasture forage was studied on a Lake Charles clay loam soil. The amount of P2O5 in pounds per acre from each source and the frequency of fall application of this amount were: 30 lbs. every year, 60 lbs. every 2 years, 120 lbs. every 4 years, 240 lbs. every 8 years, and 480 lbs. every 16 years. The area was seeded to a pasture mixture of Dallisgrass and white, Persian, and hop clovers. Yield and chemical data are reported for the first 4 years, 1950–53. At the end of the fourth year, 4 yearly 30-pound applications and two 60-pound applications of P2O5 from superphosphate had equalled and surpassed the production from single applications of 120 and 240 pounds of P2O5 from the same source. There appeared to be a similar trend with rock phosphate; however, the yearly 30-pound application has not proven very effective to date.

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