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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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    Effects of different growth media to the nutrient content of primula (primula obconica) plant
    (2018) Atikmen, Nuray Çiçek; Baran, Abdullah; Kütük, Cihat; Çaycı, Gökhan; Özaytekin, H. Hüseyin; Karaca, Siyami
    Imported moss peat (IMP) and native peat (NAP) that is taken from Akgöl/Turkey were used in thegrowth medium of primula (Primula obconica) plants. Five different growth media were prepared usingIMP and NAP, and some of their basic chemical and physical properties were determined. Then, theeffects of media characteristics on nutrient contents of primula plant were evaluated. All growth mediawas found inadequate in concentration for water soluble nutrients NO 3 -N, P, K, Fe and Zn but othernutrients were acceptable levels. Bulk density (BD) of growing media was found between 0.071-0.139g cm -3 . When the ratio of NAP was increased in mixtures, BD also increased. Moreover, the growthmedia was prepared with IMP and NAP had enough aeration capacity (AC), low available water content(AWC), and very low water buffering capacity (WBC). Cation exchange capacity (CEC) values weredetermined as 83.32-105.70 me 100 g -1 . pH and EC of the media varied between 4.56-5.88 and 0.39-1.00 dS m -1 , respectively. On the other hand, when the NAP ratio was more than 75% in the mixtures,pH level was a little out of the desired limits. Organic C level was the highest in 100% IMP media. Thequality parameters and the classical growth characteristics of primula plants were not significantlydifferent across growing media. K, Mg, S and Na contents of the plants were generally at normal levels.However, significant differences were found in total Fe, Mn and Cu contents of plants. Fe amount wasenough but Mn and Cu were lower than the acceptable levels in all media. All in all, primula plantswere grown successfully in all media and reached saleable quality levels despite of the differences insome nutrient contents. It was suggested that NAP can be used as an alternative to IMP for horticulturalpurposes, such as a production of ornamentals in a greenhouse.