Hi, I am fresh graduate in BE Aerospace Engineering (covered these specifically related topics: Control systems and Design, Flight controls and stability, Autopilots ). I have a team of Aerospace Engineers expert in Controls and stability, Propulsion, Aerodynamics, Structures. We have designed, analyzed and fabricated autonomous VTOL UAV and one of it purposes include spraying the field. We also have experience in designing the spraying mechanism to be used in drone. I can assure you the quality work for your project. Due to privacy of manufacturer, we have not attached details of VTOL UAV in portfolio but we can provide more details in chat. We will provide the coding implemented on Arduino Controller.