Cilt:26 Sayı:01 (2020)

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https://dspace.ankara.edu.tr/handle/20.500.12575/75009

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Browsing Cilt:26 Sayı:01 (2020) by Author "Dengiz, Orhan"

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    Assessment of Soil Quality Index for Tea Cultivated Soils in Ortaçay Micro Catchment in Black Sea Region
    (Ankara Üniversitesi, 2020-03-05) Dengiz, Orhan; İç, Serkan; Saygın, Fikret; İmamoğlu, Ali; Ziraat Fakültesi
    The objective of this research was to determine soil quality by taking into consideration the integrated Soil Quality Index (SQIw) model on tea plantations located in Ortaçay Micro Catchment of Rize. In the SQIw model, soil indicators were weighted by means of the Analytical Hierarchy Process (AHP). Various indicator units were normalized by a Standard Scoring Function. A total of 22 soil quality indicators were included in the SQIw model by grouping into 4 criteria which are; i-soil physical properties, ii- soil chemical properties, iii-macronutrient elements, iv- micronutrient elements. Twenty eight soil samples were collected from tea cultivated gardens including dominantly Leptosol and Alisol-Acrisol great soil groups based on FAO/WRB classification. The results indicated that 25% of the soil samples studied had weak quality level, whereas 75% were in moderate SQIw class in terms of tea requirements of the soil quality.
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    Influence of Toposequence on Physical and Mineralogical Properties of Soils Developed on Basaltic Parent Material under Sub-humid Terrestrial Ecosystem
    (Ankara Üniversitesi, 2020-03-05) Tunçay, Tülay; Dengiz, Orhan; İmamoğlu, Ali; Ziraat Fakültesi
    Understanding of soil forming factors is crucial to define physical, mineralogical and morphological properties of soils. In addition to that soil formations were highly associated with slope positions which have influence on pedogenetic and weathering process of the soils. Because, topography or relief affects how water and other material are added to and removed from soils. The aim of this study is to enhance our understanding of the role toposequence in controlling chemical weathering, influence on physical and mineralogical properties in soils developed on basaltic parent material under sub-humid terrestrial ecosystem in Black Sea region of Turkey using geochemical and mineralogical data obtained from X-ray diffraction and Scanning Electron Microscope analysis. For this purpose, four representative profiles formed on different topographic positions of transect were investigated and designated according to Soil Survey Staff (2014)/IUSS Working Group WRB (2015) classification systems. The results clearly showed that topography strongly affects soil physical, mineralogical and morphological characteristics either directly or indirectly in the local region even soils formed on the same parent material with the same climatic condition. This case was also explained with chemical weathering indices (Chemical Index of Alteration and Chemical Index of Weathering) in this study.