Apparatus (1) for spraying crop fields with cover for spraying crops (13), said apparatus being suitable for attachment to a spray vehicle and comprising a plurality of spray nozzles (7) for spraying a liquid (15) of spraying, as well as air guide means for guiding the spray liquid towards the crop and preventing the spray liquid from being dragged, said air guide means comprising at least two parallel curved air guide covers (3, 5) views in longitudinal section separated from each other that extend in longitudinal direction at right angles to the direction of movement of the vehicle and between which the spray nozzles are arranged, said air guide covers having an interior, in which both interiors are facing each other, as well as an exterior, in which both exteriors are oriented away from each other, mie n that an air channel is formed between the air guide covers having an air inlet opening into which the air flow (17) enters and an air outlet opening from which the air flow is allowed mixed with the spray liquid, characterized in that the air inlet opening is located between the two air guide covers (3, 5) while the inside of each air guide cover extends from the air inlet opening to the air outlet opening.Aparato (1) de pulverización de campos de cultivo con cubierta para pulverizar cultivos (13), siendo adecuado dicho aparato para su unión a un vehículo de pulverización y comprendiendo una pluralidad de boquillas (7) de pulverización para pulverizar un líquido (15) de pulverización, así como medios de guía de aire para guiar el líquido de pulverización hacia el cultivo y evitar que el líquido de pulverización sea arrastrado, comprendiendo dichos medios de guía de aire al menos dos cubiertas (3, 5) de guía de aire curvadas paralelas vistas en sección longitudinal separadas entre sí que se extienden en dirección longitudinal en ángulo recto con respecto a la dirección de movimiento del vehículo y entre las que están dispuestas las boquillas de pulverización, teni