A model developed previously to describe the turnover of forest soil nitrogen is modified here\ud to explain the effects of carbon and nitrogen additions on their dynamics. The model, which is structurally\ud very simple, seems to explain correctly, among other phenomena, the negative correlation between N\ud mineralization and CO₂ evolution observed in many experimental situations. An important variable used\ud to explain this behaviour is the deficiency factor, which is related to the critical C-to-nutrient ratio and\ud which gives a measure of the C or nutrient deficiency in the substrate with respect to the needs of the\ud decomposers. Ways are discussed in which the model output can be used to explain the observed retention\ud in the soil of fertilizer N added to mature forest soils
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