"PORTABLE SYSTEM FOR APPLYING GRANULATE PARTICLES", comprising: a reservoir, molded in plastic and supported in a base, by means of substantially vertical fixing structures, which project perpendicularly regarding the base; said reservoir comprises arranged over its lower end a lumbar protection, and a pair of padded carrying straps arranged transversally regarding the base and attached at the lower and upper end of the reservoir, the straps being equipped with a height adjustment element; a lid arranged at the upper region of the reservoir, which covers an inlet opening provided with a sieve; a carrying handle projecting from the lateral upper end of the reservoir, on which there is provided a protrusion at its upper end for attachment of a discharge belt for partially holding a discharge pipe; a flexible hose coupled to the reservoir at one end and to the discharge pipe at the opposite end through a hose clamp; a dosing manual command, attached to the discharge pipe, comprising a body constituted of two halves joined by screws, on which there is arranged a handle and an actuation lever connected to the handle through a torsion spring; the lower part of the actuation lever being slidably connected to an arm, which is turn is pivotally connected to the base of the handle through a pin and a spring which biases the arm towards the lower end of a slit which constitutes the sliding connection of the actuation lever; coupled to this arm there are provided two levers which move a slide valve, which slides over guides present in the body closing and opening the valve when the actuation lever is actuated; the slide valve being guided by bushing at an end and by a shaft at the other. a reservoir, molded in plastic and supported in a base, by means of substantially vertical fixing structures, which project perpendicularly regarding the base; said reservoir comprises arranged over its lower end a lumbar protection, and a pair of padded carrying straps arranged transversally regarding the base and attached at the lower and upper end of the reservoir, the straps being equipped with a height adjustment element; a lid arranged at the upper region of the reservoir, which covers an inlet opening provided with a sieve; a carrying handle projecting from the lateral upper end of the reservoir, on which there is provided a protrusion at its upper end for attachment of a discharge belt for partially holding a discharge pipe; a flexible hose coupled to the reservoir at one end and to the discharge pipe at the opposite end through a hose clamp; a dosing manual command, attached to the discharge pipe, comprising a body constituted of two halves joined by screws, on which there is arranged a handle and an actuation lever connected to the handle through a torsion spring; the lower part of the actuation lever being slidably connected to an arm, which is turn is pivotally connected to the base of the handle through a pin and a spring which biases the arm towards the lower end of a slit which constitutes the sliding connection of the actuation lever; coupled to this arm there are provided two levers which move a slide valve, which slides over guides present in the body closing and opening the valve when the actuation lever is actuated; the slide valve being guided by bushing at an end and by a shaft at the other.