From a technical standpoint, a fertiliser is defined as an input whose sum of the percentages of the NPK elements (nitrogen, phosphorus and potassium) is greater than or equal to 7% of the mass of the product. Other inputs are considered to be soil improvers.
A fertiliser is intended to compensate for any deficiency quickly but is not ideal in the long term; it is intended to stimulate the plant. A soil improver is intended to give the soil structure and material to be broken down by the soil's microfauna in order to release mineral elements through mineralisation. The choice of one or the other will be determined by the soil's requirements and the vines' requirements.
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