The effect of overlapping adjacent passages of the unit on the uniformity of the application of mineral fertilizers

The article presents some results of studies on the effect of overlapping widths on the uniform distribution of fertilizers on adjacent passages of an aggregate conducted at the N.P.Ogarev Mordovia State University. Recommendations are offered on reducing the ratio between the working width and the spreading width during centrifugal apparatus operation. Observations showed that spreaders with centrifugal type working elements distribute fertilizers unevenly across the working width. Most of them fall in the middle, and towards the edges their number decreases. To achieve a more uniform application, they are usually scattered with overlap. The studies are conducted to determine the effect of overlap on the uniform distribution of mineral fertilizers. To assess the uniformity of the surface distribution of mineral fertilizers and lime by the experimental setup along the working width and in the direction of travel, the fertilizers were collected in baking sheets of 0,5×0,5×0,1 m in size. The baking sheets were placed on an even area tightly to each other in three rows with row spacing of 5 m. During the experiments, the non-uniformity of fertilizer application at a machine grip width of 10 m with an overlap of 2 m was higher than the agrotechnical permissible values - 25 %. Studies have shown that it is possible to increase the uniformity of application while reducing the width of the aggregate to 8 m, while the overlap should be at least 4 m. Studies have shown that it is possible to increase the uniformity of application while reducing the width of the aggregate to 8 m, while the overlap should be at least 4 m. At the same time, the problem of ensuring accurate driving of fertilizer applicators is even more acute with an increase in the working width of modern high-performance equipment. Obviously, in this case, in the absence of special stands for the operational tuning of machinery, it is very difficult to correctly adjust them. Therefore, each time you change the type of fertilizer and doses you need to check the position of the regulator with the recommended operating instructions. The working width of the grip depends on this, and, consequently, the distance between adjacent passages of the unit is dependent. The quality of centrifugal machines, in addition, depends on the quality of the applied mineral fertilizers (range of sizes and shapes of granules, flow-ability), the state of the field topography, the evenness of the soil, wind speed, the qualification of the machine operator and its good faith (strict adherence to a given speed), operating speed and etc. Obviously, in order to introduce mineral fertilizers with permissible unevenness (permissible coefficient of variation for nitrogen fertilizers ±10 %, for potash and phosphorus ±20 %), centrifugal working bodies must strictly comply with the requirements of the work execution regulations.

centrifugal working body, unit, application, uniformity, norm, overlap