1. An agricultural seed drill with automatic distribution, comprising: a pneumatic conveying device (4) comprising a mixing chamber (41) for mixing bulk materials (M) with an air stream, a distributor (5) for bulk materials (M) containing a through pipe ( 8) for bulk materials (M), a diffuser (6) that receives air flow mixed with bulk materials (M) in order to distribute it into the metering elements, and a device for calibrating bulk materials distributed a body (5), comprising: a calibration hole (9), which is made in a through pipe (8) between the seed distributor (5) and the device (4) for transporting material (M), a through hole (42) between the through pipe (8) and a mixing chamber (41) and a slide (10), which is selectively connected to a calibration hole (9) of the through hole (42), characterized in that the through hole (42) is made in the region of the separation wall (15) between the mixing chamber (41) and distributor (5), limiting the mixing chamber (41), and the fact that he and further comprises a mechanized actuator (11), which is configured to rotate the valve (10) between the calibration position, in which the valve (10) is supported on the wall (15) in order to close the through hole (42), and the distribution position, in which the calibration hole (9) is closed and the material can pass through the through hole (42) to the transport device (4) .2. An agricultural seed drill according to claim 1, in which the rotation of the valve (10) occurs in the direction away from the mixing chamber1. Сельскохозяйственная рядовая сеялка с автоматическим распределением, содержащая:пневматическое транспортировочное устройство (4), содержащее смесительную камеру (41) для смешивания сыпучих материалов (M) с воздушным потоком,распределитель (5) для сыпучих материалов (M), содержащий сквозной трубопровод (8) для сыпучих материалов (M),диффузор (6), который принимает воздушный поток, смешанный с сыпучими материалами (M) для того, чтобы распределять его в высевающ
