Design of a System for the Mechanization of Subsoil Compost Tea Distribution

Compost tea is an aqueous mixture of organic and inorganic compounds generated by compost. Although several authors have highlighted how these extracts have a positive effect on the control of pathogens and as a promoter of plant growth, the biological mechanism underlying the effects found is still unclear. Similarly, there is no mechanised agricultural system or machine designed for distribution. The application of compost tea is currently carried out on soil or leaves, generally on small surfaces. Interest in these extracts is growing from both researchers and farmers. Regarding soil distribution, this should be subsurface to avoid stress to the compost tea microbiota, while for foliar distribution, this occurs through sprayers. The pressure and the formation of organic films represent the two critical factors in distribution. The study aims to design the mechanics of a machine for soil processing using mathematical models. The designed machine is a 5-shank ripper with a tow hitch with a hydraulic tilt piston, the main frame, and a rear trolley (500/50 R17 wheels) built in C40 steel. The anchors have been sized on forces of 30kN applied to the edge of the tips and lateral face. The processing elements are arranged in two rows (48  cm apart). The anchors have a thickness of 35 mm. In aisi440 stainless steel, the distribution system includes two 300 l tanks coupled to a 6-element membrane pump and 5 distribution tubes (40  mm). The distribution system has been designed to house various monitoring sensors.