TAILIEUCHUNG - Soil formation overlying volcanic materials at Mount Erenler, Konya, Turkey
The objectives of the present work were to assess the influence uence of climate and other soil-forming factors on physical, chemical, and mineralogical characteristics and pedological processes in the soil genesis and soil classification of 4 volcanic soil profiles derived from andesitic parent material, and to determine whether they meet the requirements for classification as Andisols. | S. ÖZCAN, H. H. ÖZAYTEKİN Research Article Turk J Agric For 35 (2011) 545-562 © TÜBİTAK doi: Soil formation overlying volcanic materials at Mount Erenler, Konya, Turkey Sıdıka ÖZCAN1, Hasan Hüseyin ÖZAYTEKİN2,* 1 Ümit Özcan Medikal Ltd. Şti., Konya - TURKEY 2 Selçuk University, Agriculture Faculty, Department of Soil Science and Plant Nutrition, 42079 Konya - TURKEY Received: Abstract: Studies of soils developed on volcanic materials are insufficient in Turkey in light of the wide distribution of these soils. The objectives of the present work were to assess the influence of climate and other soil-forming factors on physical, chemical, and mineralogical characteristics and pedological processes in the soil genesis and soil classification of 4 volcanic soil profiles derived from andesitic parent material, and to determine whether they meet the requirements for classification as Andisols. Collected from a semiarid climate in Konya, Turkey, these soils are characterized as mediumand fine-textured with low organic matter content, low cation exchange capacity, and low soil moisture retention. Bulk density was greater than g cm–3 in all profiles. In general, phosphate retention was low, and lower than 85% in all profiles. The Al + ½ Fe percentages (by ammonium oxalate) were lower than 2% in all profiles. The pH values in NaF were less than in the soils studied. Selective extraction yielded the following relationship in all extractions: Fed > Feo > Fep. Additionally, in most horizons: Alp > Alo > Ald. According to selective dissolution analysis results and index values, noncrystalline minerals such as allophane, imogolite, and iron-humus complexes have not formed in these soils. Only noncrystalline minerals were present, such as Al-humus complexes in great quantities, and, in small quantities, ferrihydrite. Crystallized Fe minerals were more common than other Fe minerals. Feldspar, cristobalite, and quartz were the most .
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