Abstract: A mobile spray applicator for treating forage with a liquid chemical spray after it first picks up the windrow, and separates and spreads out the windrow material across the width of a moving conveyor belt while holding a portion of the material spaced from the surface of the conveyor belt. The spread out material forms a plurality of openings and interstices therethrough so that as it exits from the end of the conveyor, the upper surface of the forage is flood or mist sprayed with the liquid chemical. The chemical enters the openings and interstices and coats the upper surfaces of the forage disposed therebelow. As the sprayed forage falls away from the conveyor exit, its undersurface is also flood or mist sprayed so that a substantial portion of the forage is coated or wetted with the chemical. Liquid chemical agents which can be so applied include drying agents, nutrients, feed supplements, feed flavorings and the like.