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Selçuk Üniversitesi (2007)

Organic matter, nutrient contents, cation exchange capacity of fine eart fractions of some great soil groups in Konya basin

ÖZULU Mehmet

Titre : Organic matter, nutrient contents, cation exchange capacity of fine eart fractions of some great soil groups in Konya basin

Konya havzasındaki bazı büyük toprak grupları ince fraksiyonlarının organik madde, besin maddeleri içeriği ve katyon değişim kapasitesi

Auteur : ÖZULU Mehmet

Université de soutenance : Selçuk Üniversitesi

Grade : Master 2007

Résumé
Soil organic carbon associated with clay and silt size particles in soils. Cultivation of native land reduce the quality of soil by decreasing top soil contents of organic carbon, total nitrogen and phosphorous in semi arid regions. For cultivated soils soil organic carbon is lost from the soil during various operations such as tillage, crop removal, lack of crop cover between cropping season and as a result this soil organic carbon is typically lower than the maximum concentration in cultivated soils has been proposed to have a maximum concentrations that is referred to as the soil protective capacity. Land use and management affects soil organic carbon. This situation is widespread problem in semi arid areas, may lead decline in soil productivity since the decreased soil organic matter. The objective of this study was to analysis the changes produced by cultivation on organic carbon, total nitrogen, available phosphate, available potassium and CEC in two particles size and four different semi arid soils of Konya closed catchments area. For this purpose soil samples were taken from the top 30 cm at 13 cultivated and 13 native soils. The size fractions from soil samples were isolated without chemical pretreatment by ultrasonic dispersion in water followed by sedimentation ? syphonation . The distribution of organic matter within size fractions varied with land use significant differences in soil organic C, total N, available P and available K among these land uses were found. Higher values in Soil organic C, total N were measured in soil from native soils. Both cultivated and native soils had greater percentage (on average) of total soil organic carbon in < 2µm fractions than 2-50 µm fractions. The distributions of soil N between clay and silt size fractions followed a similar pattern to that shown by soil organic carbon. The higher C/N ratio obtained for the 2-50 µm fractions for both forest and cultivated soils suggest the presence of less decomposed organic matter, while the organic matter associated with the < 2µm fractions can be considered to be more humified. The cation exchange capacity of organa-mineral fractions were correlated with their respective C and clay contents. The clay- size fractions had highest CEC which was related to its mineralogical composition. Both cultivated and native soils had higher available phosphorous in clay fractions than silt fractions, available Potassium of soils fractions were not correlated with land use but related soil mineralogical compositio

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