FIELD: agriculture.SUBSTANCE: pneumatic scarifier for presowing treatment of seeds of perennial grasses comprises a loading hopper for seeds with a dispenser, a fan for feeding a uniform flow of seeds from the dispenser using air through the tube into the hopper for seed scarification and their subsequent removal. Scarification is carried out using scarification surface coated with abrasive emery material. Feeding of seeds from the coil dispenser with injector is carried out through the work shaft which is provided with a dispensing head with drill tubes with the lower cut ends directed to scarification surface of toroidal shape. The latter is mounted on the wall of the hopper for seed scarification with the ability of vertical movement to adjust the angle of the sliding contact of seeds to it. On the suction nozzle of the fan a valve is mounted for adjustment of speed of contact of seeds.EFFECT: use of the invention enables to improve the quality of scarification of solid seeds with a water-impermeable shell.3 dwg
