The method involves measuring the ground temperature by a temperature sensor (3) on the vehicle so that the amount of material to be dispersed is changed in accordance with the temperature gradients. The method can include determining the actual vehicle position through a positioning system and anticipating the temperature change. Independent claim describes device for adapting amount of material by using a control device (2) connected to a temperature sensor. The control device can be set up to increase the amount of material the more negative the temperature gradient.
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