Methods of determining lime requirements of soils in the eastern Black Sea hazelnut growing region

Ozenc D.

5th International Congress on Hazelnut, Oregon, United States Of America, 27 - 31 August 2000, pp.335-341 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: Oregon
  • Country: United States Of America
  • Page Numbers: pp.335-341
  • Karadeniz Technical University Affiliated: No


The soils in the eastern Black Sea region are strongly acidic and the coastal zone is low in calcium. Hazelnut (Corylus avellana L.) yields are generally lower on highly acidic soils. The pH level required for both high yield and high quality is between 6 and 7. This research was carried out using soil samples from 12 hazelnut orchards in Ordu, Giresun and Trabzon provinces to compare methods of determining lime requirements to increase pH to 6.5. The physical and chemical properties of the soil that affect the amount of calcium required were determined. The CaCO3 incubation method was used as the standard method and compared to six laboratory methods: Woodruff, Dunn, SMP, Caacetate, BaCl2-TEA, and KCl. Among these chemical methods, the Dunn and Woodruff methods produced results most similar to those of the CaCO3 incubation method, and are therefore regarded as the most suitable approaches. The Dunn and Woodruff methods are recommended for determining the calcium requirements of soils with a clay-loam or loam texture, a pH between 3.76-5.80, and organic matter between 1.22% and 4.51%.