Abstract:

Soil color is an important data source about the morphological, physical, chemical and mineralogical properties of the soil. Therefore, soil scientists benefit significantly from soil color differences in determining the boundaries of soil horizons in field conditions. The aim of this research was to determine the effect of soils taken from A and C horizons on the relationship between some physical-chemical properties and digital color parameters (L, a and b). Ninety-one soil samples were taken from the A and C horizons of 17 soil profiles in the upper and lower zones of the alluvial land. Digital color parameters (L, a and b), texture, pH, electrical conductivity, lime, organic matter, exchangeable K, Na, Ca+Mg, cation exchange capacity (CEC) analyzes were performed in soil samples. A significant correlation was found between L value and pH (0.77**) and lime (0.82**), between a value and sand (0.54**), Ca+Mg (-0.65**) and CEC (-0.65**), and between b value and sand (0.52**), Ca+Mg (-0.55**) and CEC (-0.56**) in the A horizons. A significant correlation was found between L value and silt (0.57**), pH (0.65**), lime (0.81**) and K (-0.50**), between a value and clay (-0.58**), sand (0.48**), and between b and clay (-0.55**), lime (0.68**) in the C horizons. According to the results of multiple linear regression analysis; pH (R2= 0.68) value can be determined with L and a values, and lime (R2= 0.73) content can be determined using a and b values in A horizons, and lime content can be determined using L, a and b values in C horizons. It is concluded that digital color parameters can be used more reliably determining pH and lime content and this performance is affected by A and C horizons.

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