Browsing by Author "Çimrin, K.M."

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Determination of the Phosphorus Fixation of the Wheat-Growing Soils in the Lake Van Basin
(2006) Boysan, S.; Çimrin, K.M.
The aim of this study was to assess phosphorus fixation and impinging factors on wheat cultivated fields around the Lake Van region. Main soil groups were taken into account according to their folding areas representing the province, namely Calcisol Cambisol, Kastanozem, Fluvisol and Regosol, in two levels of depth, 0-20 cm and 20-40 cm. A total of 52 soil samples were taken from different areas. Phosphorus fixation capacity was calculated by adding three level of phosphorus, 25 ppm, 50 ppm, 150 ppm; half an hour, twenty-four hours and seventy two hours. Phosphorus fixations were found to be 51.2% in Calcisols, 45.2% in Cambisols, 50.8% in Kastanozems, 47.8% in Fluvisols and 45.1% in Regosol groups. It was also recorded that the big proportion of phosphorus fixations at all soil group occurred in half an hour's time. There were significant correlations between characteristics of soil groups and phosphorus fixation. These correlations with phosphorus fixation, within Calcisol soils, CEC and organic matter, within Cambisols, clay, silt, sand, organic matter and CEC, within Fluvisols, clay, sand, CaCO3 and pH, within regosols, clay and CaCO and pH were detected positively. However, within Cambisol and Fluvisol, negative correlations between phosphorus fixation and sand were detected. © 2006 Asian Network for Scientific Information.
Differentiating the Natural and Man-Made Terraces of Lake Van, Eastern Anatolia, Utilizing Earth Science Methods
(Blackwell Publishing, 2008) Akça, E.; Çimrin, K.M.; Ryan, J.; Nagano, T.; Topaksu, M.; Kapur, S.
The Fertile Crescent of the Middle East region, embracing Syria, eastern Turkey and Iraq, marks the region where settled agriculture began, and where the landscape has been shaped for millennia by human activities. The lacustrine and fluvial terraces of the Late Pleistocene and Holocene Eras are common geomorphic features in many areas around Lake Van in eastern Turkey, being sustainably used since the Urartian Period (800-400 years bc). Fluctuations in the water levels of Lake Van have resulted in the development of widely distributed natural terraces around the Lake. The undulating slopes of these terraces have limited their cultivation, however, leading people to reconstruct terraces as a means for utilizing particular production sites, as anthroscapes (this concept is generally confined to situations where marked differences or deviations from the normal, natural landscapes are attributable to effects/shaping by humans). The region exhibits semiarid climatic conditions and a short crop-growing season, currently being under the threat of land degradation. Recent mismanagement of these lands as a result of increasing population pressures has led to the degradation of both the natural and the man-made terraces. Thus, there is an urgent need to conserve and understand the indigenous management and soil quality attributes of these man-made terraces. To this end, this study examined soil profiles and analysed soil samples for their chemical, physical and mineralogical characteristics, in order to determine the human effects of leaching and/or accumulation. These analyses revealed significant differences between the physical, chemical, microbiological and mineralogical properties of the man-made/reworked terraces and natural terraces under essentially similar parent materials and environment, thereby providing clues as to the sustainable management of these land surfaces in eastern Turkey. The approaches used in this study provide useful evidence for attempting to explain the historical evolution of land use in similar environments elsewhere, as well as the significance of terraces in combating coastal erosion in lake environments. © Journal compilation © 2008 Blackwell Publishing Asia Pty Ltd.
Potassium Potential of the Soils of the Gevaş Region in Eastern Anatolia
(TUBITAK, 2004) Çimrin, K.M.; Akça, E.; Şenol, M.; Büyük, G.; Kapur, S.
Due to its semi-arid climate and sloping topography, Eastern Anatolia has limited soil resources for agriculture, strongly necessitating sustainable land management. Fertile soils occur only in limited areas such as the Gevaş region, where sugar beet is one of the main crops with a particular need for K. Unfortunately, studies on the non-exchangeable (slowly available) and exchangeable K contents, along with soil properties such as clay mineralogy, organic matter content and texture, which are closely related to soil production potential, are not sufficient in the region. Thus, 40 soil samples out of 7 soil series were collected for the determination of the K - potential of the region. Results revealed that the non-exchangeable K (potential) of the Gevaş region soils has predominantly originated from illite and exchangeable K (available) from organic matter and illite. The exchangeable potassium levels for Hasbey II, Yuva, Yemişlik II, Orak and Iskele and Yemişlik, Hasbey, Hasbey III, Güzelkonak, Güzelkonak II are determined to be sufficient for the present non-intensive agriculture, but for the Mülk soils there is a need for K fertilisation. The results of this study are expected to partly relieve the low - income farmers of the area from the economical burden of fertilization for K practiced in the present non - intensive agriculture. © TÜBITAK.