Composing the database of thrace soils and some soil characteristics

In this study, determining the nutrients of the soils, productivity and potential toxic elements, composing the soil data base and mapping of the agricultural lands by evaluating the characteristics within Geographic Information Systems (GIS) in K？rklareli, Edirne and Tekirda？ provinces which compose a major part of Thrace region (except ？stanbul and Gallipoli) was aimed. For this purpose, soil samples were obtained according to 2.5 km x 2.5 km grid system from 0-20 cm surface from the agricultural lands in 2014-2015-2016 years. In these soil samples, main soil fertility parameters (texture, saturation percentage, soil reaction, electrical conductivity, lime content, organic matter content, available phosphorus), macro and micro nutrients (exchangeable K, Ca, Mg, Na and B, plant-available Fe, Cu, Zn and Mn) and potential toxic element contents (Cu, Zn, Ni, Cd, Cr, Pb and Co) were determined. When the results of the analysis of Thrace soils are evaluated within the scope of this research, it can be said that about 1/3 of the land is light, 1/5 is medium and 2/5 is heavy. For soil reaction, approximately 2/5 of the acid, 1/5 of the neutral and 2/5 of the alkaline reaction. 3/4 of soil is salt free and the other part is very light and slightly salty. In terms of lime, 1/2 is not calcareous and very little calcareous, 1/7 is little calcareous, 1/5 is medium calcareous and calcerous and 1/10 is very high calcareous. In terms of organic matter, 1/5 is very poor, 3/5 is less, 1/5 is medium and rich, 1/5 of phosphorus is inadequate and very inadequate, 1/4 is medium, 3/10 of them are high and 1/5 is very high, 1/7 of potassium is inadequate, 1/4 is middle and rich and 3/5 is rich and very rich. In terms of extractable magnesium, 1/10 is inadequate and very inadequate, 3/5 is medium and 1/5 is high and very high, extractable iron is /10 low and the rest is in sufficient class