Apparatus for distributing a bulk material, in particular seeds or fertilisers on agricultural productive surfaces comprising - a distribution device having at least one bulk material inlet which can be connected to a bulk material supply and a plurality of bulk material outlets, - a plurality of bulk material conduits connected to the bulk material outlets for distribution of the bulk material on to a predetermined working width, wherein the bulk material conduits at their downstream end each have a respective connecting portion for coupling to an application device, wherein the application device is adapted in particular for discharge of the bulk material in the direction of the productive surfaces, - wherein a bulk material outlet and the bulk material conduit connected to the bulk material outlet define a respective flow path, - a device for blockage detection in individual ones, a plurality of or all flow paths, which has - a plurality of sensors which are respectively introduced into one of the flow paths and are adapted to output a measurement signal, dependent on the delivery flow in the flow path, and - an electronic evaluation unit which is adapted to receive the measurement signals output by the sensors, compare them to each other and on the basis of signal deviations determined in that case to identify individual ones of or a plurality of flow paths as blocked, characterized in that each sensor comprises at least one clip (100, 200) which is fitted around one of the conduits, wherein the clip (100, 200) has a projection (101, 201) extending into the flow path through a corresponding opening in the conduit, wherein - the clip has an insertion portion for receiving the sensor and a passage means extending as far as the projection for the sensor, - the projection of the clip is in the form of a measurement cap thermally conductive connected with a sensor, wherein for signal output to the electronic evaluation unit a connecting cable (29a, b) is connected to the sensor element, and wherein the sensors are directed from a location of their entry into the respective flow path in a downstream direction. - a distribution device having at least one bulk material inlet which can be connected to a bulk material supply and a plurality of bulk material outlets, - a plurality of bulk material conduits connected to the bulk material outlets for distribution of the bulk material on to a predetermined working width, wherein the bulk material conduits at their downstream end each have a respective connecting portion for coupling to an application device, wherein the application device is adapted in particular for discharge of the bulk material in the direction of the productive surfaces, - wherein a bulk material outlet and the bulk material conduit connected to the bulk material outlet define a respective flow path, - a device for blockage detection in individual ones, a plurality of or all flow paths, which has - a plurality of sensors which are respectively introduced into one of the flow paths and are adapted to output a measurement signal, dependent on the delivery flow in the flow path, and - an electronic evaluation unit which is adapted to receive the measurement signals output by the sensors, compare them to each other and on the basis of signal deviations determined in that case to identify individual ones of or a plurality of flow paths as blocked, characterized in that each sensor comprises at least one clip (100, 200) which is fitted around one of the conduits, wherein the clip (100, 200) has a projection (101, 201) extending into the flow path through a corresponding opening in the conduit, wherein - the clip has an insertion portion for receiving the sensor and a passage means extending as far as the projection for the sensor, - the projection of the clip is in the form of a measurement cap thermally conductive connected with a sensor, wherein for signal output to the electronic evaluation unit a connecting cable (29a, b) is connected to the sensor element, and wherein the sensors are directed from a location of their entry into the respective flow path in a downstream direction.