314 filed feb 5 1975 now u s pat no 3 964 639 may be incorporated if desired in the tubes 90 prior to the material dropping into a triangular distributor 92 for laying the material on the ground in a band it will be noted from fig1 and 2 that discharge tubes are provided for each row from each of the dispensers 40 and 41 since the length of the discharge extension tubes 90 will vary depending on the distance of the row from the dispenser housing it is preferable that the longer tubes be of a larger diameter to minimize differences in the air flow through the tubes thus the bulk of the air flow for transporting the material through the discharge tubes enters the collection passages 79 from the plenum chamber 80 through the passages 83 rather than through the material collection openings 79a of the passages 79 ideally all of the transporting air would be introduced at this point since the distribution between the openings 79a of the material falling off the buckets 65 would be least affected if it fell into the collection passages 79 only under the influence of gravity and in the absence of any air flow if the pressure drop caused by the reduction in cross sectional.