Abstract: By using KMnO₄-oxidation method, this paper determined the oxidizable organic carbon content in soils originated from eight parent rocks. The results showed that the content of soil oxidizable organic carbon differed significantly with different parent rocks. Soil oxidizable organic carbon had a significant negative correlation with soil available phosphorus, total nitrogen, available potassium,sand,and silt,a significant positive correlation with soil bulk density,and no relationship with soil organic matter, available nitrogen, pH, coarse sand,fine sand,clay,and gravel.

Key words: ALMANAC model, Scale, Sorghum, Maize