Spreading of powder lime, the basic Ca fertilizer, makes great difficulties because of required high distributing precision, spreading losses and natural environment protection. The machines for lime spreading, eqquipped with transverse beams, were divided into two groups, according to the low-or high operating pressure. The process of dusty material translocation along the beam and throwing it out through the outlet holes in bottom part of a beam were theoretically analysed. Assuming the condition of dynamic force equilibrium a differential equation was obtained which describes the motion of air-fertilizer mixture stream into spreading beam considering the streams separated into particular holes. The integration of motion equation yielded an expression for the volumetric output of lime solid fraction from an outlet hole. The output depends on the parameters such as the beam inclination angle, outlet hole area, coefficient of particle shape, height of mixture layer etc. On the background of theoretical considerations the changes in construction of pneumatic fertilizer spreaders RUP-10, RUP-15, AVP-10 were instroduced. The results of laboratory and field investigations showed that these changes improved spreading uniformity and reduced lime dusting.
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