Agricultural pneumatic distribution machine for distributing at least one granular material to be distributed, preferably seed and/or fertilizer, having - at least one distribution head , which is connected to a metering member via a delivery line , wherein the distribution head has a plurality of outlet openings and each outlet opening is connected pneumatically to at least one dispensing element via a dispensing line (44, 44a-441), wherein at least some of the dispensing lines (44, 44a-441) are able to be blocked by means of a switching element such that the entry of an air/material mixture into the corresponding dispensing line (44, 44a-44l) is prevented, wherein at least some outlet openings are respectively connected pneumatically to the delivery line via a return line (38, 38a-381) and the return lines (38, 38a-381) each have a branch, which is connected to a bypass line that leads into the associated dispensing line (44, 44a-44l) and wherein a feed region comprises at least the end region of the delivery line , the distribution head and the return lines (38, 38a-381) and the returned material can circulate within the feed region; and - a control system , which is configured to control the metering member , characterized in that the control system is configured to control the metering member on the basis of the advancing rate of the distribution machine , a delivery time of the material to be distributed from the metering member to the distribution head , and a delivery time of the material to be distributed from the distribution head to the dispensing elements , such that at any time, the currently required total quantity of material to be dispensed is already present at the distribution head , wherein, at any time, the determined required total quantity of material to be dispensed is already circulating in the return region and, before at least one previously blocked dispensing line (44, 44a-441) is opened up, a required sub-quantity is fed without delay to the corresponding dispensing line (44, 44a-441). - at least one distribution head , which is connected to a metering member via a delivery line , wherein the distribution head has a plurality of outlet openings and each outlet opening is connected pneumatically to at least one dispensing element via a dispensing line (44, 44a-441), wherein at least some of the dispensing lines (44, 44a-441) are able to be blocked by means of a switching element such that the entry of an air/material mixture into the corresponding dispensing line (44, 44a-44l) is prevented, wherein at least some outlet openings are respectively connected pneumatically to the delivery line via a return line (38, 38a-381) and the return lines (38, 38a-381) each have a branch, which is connected to a bypass line that leads into the associated dispensing line (44, 44a-44l) and wherein a feed region comprises at least the end region of the delivery line , the distribution head and the return lines (38, 38a-381) and the returned material can circulate within the feed region; and - a control system , which is configured to control the metering member , characterized in that the control system is configured to control the metering member on the basis of the advancing rate of the distribution machine , a delivery time of the material to be distributed from the metering member to the distribution head , and a delivery time of the material to be distributed from the distribution head to the dispensing elements , such that at any time, the currently required total quantity of material to be dispensed is already present at the distribution head , wherein, at any time, the determined required total quantity of material to be dispensed is already circulating in the return region and, before at least one previously blocked dispensing line (44, 44a-441) is opened up, a required sub-quantity is fed without delay to the corresponding dispensing line (44, 44a-441). <EOS>