Yazar "Dengiz, Orhan" seçeneğine göre listele

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    Characteristics, genesis and classification of a basin peat soil under negative human impact in Turkey
    (SPRINGER, 2009) Dengiz, Orhan; Ozaytekin, H. Huseyin; Cayci, Gokhan; Baran, Abdullah
    The objective of this research was to investigate the morphology, genesis and classification of organic soils formed on depression and flat land around Lake Yenicaga, west-central Turkey. Formation of the area has been influenced by tectonic and karst processes. This peatland is important in this area due to its extensive use as a horticultural plant growth medium resulting from positive physical and chemical properties. Organic soils in the study area were formed in nutrient-rich conditions and it is classified as typical basin peat. Four representative pedons were excavated in the study area based on extensive observations performed with random grid method using an auger. Samples were taken from horizons in each profile for laboratory analyses. Organic matter contents ranged from 12.5 to 91.5% across all four pedons. Fiber contents were between 4.3 and 91.5%, and N ranged from 0.56 to 2.19%. Cation exchange capacity ranged from 37 to 222 cmol kg(-1), bulk density from 0.09 to 0.78 g cm(-3), lime from 0.15 to 2.62%. The pH and EC(e) values ranged from 5.38 to 7.92 and 0.50 to 3.80 dS m(-1), respectively. Sand, silt and clay contents of the organic soils ranged between 0.75-3.92, 40.70-74.77 and 24.15-57.30%, respectively. Differences in organic soils were found to depend on the environment, botanical origins, decomposition degrees, and groundwater composition. The organic soils of the research area were classified in the typic, hemic and hydric subgroups of Medifibrists (Soil Taxonomy 1999).
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    Generating of land suitability index for wheat with hybrid system aproach using AHP and GIS
    (ELSEVIER SCI LTD, 2019) Dedeoğlu, Mert.; Dengiz, Orhan
    Today, crop models have been developed to products of strategic importance for precision agriculture management in the countries. The objective of this study was to generate the wheat suitability index (WSI) by using hybrid system that is including qualitative and quantitative reasons such as expert and sciencific knowledge weighted with analytic hierarchy process (AHP). This aproach was integrated into the GIS based on Linear Combination Teqnique in the study. For this purpose, the study was conducted in the field of wheat cultivation in Sogulca Basin with an area of 68.04 km(2) located on Central Anatolia Region of Turkey. We have selected 10 criteria as physical, chemical and topographical that affects wheat cultivation in the basin which has been divided into 47 land units according to thematic soil map. With the WSI model, 32.05% of the study area was classified as highly and moderately suitable whereas, 67.95% of the total study area has marginally and not suitable properties for wheat cultivation. According to results, the most effective factors on the last score values for WSI were found soil depth, texture and slope indicators. The score values of the WSI were compared with 5 years (2013-2017) yields and NDVI values for testing of the model and it has been determined that land classification for wheat has been done with high accuracy for yield r(2) = 0.83% and for NDVI r(2) = 0.78%. The results of the study showed that the WSI was found as convenient model in semi-arid climate condition. However, we suggest that the WSI model should also be tested in similar climatic conditions and in different soil types in order to be available as a general - pass index. In addition, using AHP with GIS capabilities, we have high capacity to the integration of heterogeneous data for determination and classification of suitability in the agriculture areas.
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    WEATHERING RATES AND SOME PHYSICO-CHEMICAL CHARACTERISTICS OF SOILS DEVELOPED ON A CALCIC TOPOSEQUENCES
    (NORTH UNIV BAIA MARE, 2013) Dengiz, Orhan; Saglam, Mustafa; Ozaytekin, H. Huseyin; Baskan, Oguz
    Soil formations were highly associated with topographic positions which have influence on morphological, mineralogical 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 carry out a pedological assessment of the soils classified as Regosol, Cambisol and Vertisol by taking into consideration FAO classification system formed on different topographic position and the same parent rocks (limestone-marl). In addition the second aim of this research is to answer the question about the difference in classification resulting from pedogenic processes or from other factors by determining the degree of weathering soils using geochemical data. For this aim, after macro-morphological identifications were completed for three representative soil pedons, the soil samples were then collected from the horizons to investigate the analytical characteristics such as mineralogical, geochemical and physio-chemical properties. The study will also take into account other features such as the pedogenic evolution of soils using weathering indices such as CIA, CIW, Base/R2O3, WIP and PIA. According to results, CIA, CIW, PIA and WIT index values of all soils varied between 66.75-73.87, 73.48 - 81.79, 57.60-68.49, respectively. In addition it was found that the bases/R2O3 values of most of the soils were below 1.0. The results clearly showed that topographic condition strongly affects on soil physic-chemical, mineralogical and morphological properties either directly or indirectly in the local region. This case was also explained with chemical weathering indices in this study.