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Agronomy Journal Abstract -

Influence of Limestone and Nitrogen on Soil pH and Coastal Bermudagrass Yield1


This article in AJ

  1. Vol. 59 No. 5, p. 450-453
    Received: Mar 25, 1967

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  1. W. E. Adams,
  2. R. W. Pearson,
  3. W. A. Jackson and
  4. R. A. McCreery2



‘Coastal’ bermudagrass was grown on an extremely acid Cecil sandy loam soil in order to study the influence of limestone rate (0, 7~846, and 40,349 kg/ha), limestone placement (surface and mixed), and N levels (0, 224, 448, 896, and 1,793 kg/ha) on forage production, rooting, and changes in soil properties.

Without limestone, annual forage production declined with time at the 448-kg/ha N level and above, and Coastal bermudagrass plants exhibited a severe chlorosis. At the two highest N levels (896 and 1,793 kg/ha), up~o 90% of the plants died.

Limestone increased annual forage yields at N rates of 896 kg/ha and above. Mixing the limestone with the surface soil resulted in significantly higher forage yields at the 1,793-kg/ha level. The movement of Ca and Mg into all soil zones down to the 30- to 45-cm zone confirmed the changes in soil pH.

Soil pH was reduced by annual applications of 448 kg/ha of 1N and forage yields of Coastal bermudagrass were severely restricted.

Coastal roots penetrated to 120 cm in soil with a range in pH from 4.0 to 4.5, emphasizing the extreme tolerance of this grass to very low soil pH.

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