The soil organic carbon content played an important role in soil fertility, then fruit yield and quality. The prediction of soil organic carbon in the fields at wider regions requires a large number of samples that are costly to analyze. The objective of this study was to apply pedotransfer function to quantify soil colour concerning soil organic carbon from 82 soil samples. A case study in Haugiang province, Vietnam. The results showed that there has a complicated relation to soil properties. Soil colour has the same Munsell Hue, but there is different between Munsell Value and Chroma when the soil has at the same humidity. Organic Carbon content ranged from 1,32 to 5,6%. There was negative significant correlation between organic C content and Munsell soil color, such as with Munsell Value (r = -0,75** air-dry, r = -0,74** moist); Munsell Chroma (r= -0,55** air-dry, r = -0,66** moist). Since, Visual soil colour assessment is useful predictors of organic C content, especially for topsoil. This study indicates that soil organic content can be predicted by using Munsell soil colours for visual field measurements on the old raised bed soils at the moist condition, which can be used for field soil fertility degradation recommendation. However, more study of pedotransfer function on other soils condition must be correlated for further recommendation.
 

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