Spray device for spraying liquid on crops

Spraying device for coupling to an elongated boom present on an agricultural tractor for spraying liquid onto crops, comprising:

• an elongated first blade, pivotally connected to the boom about a first pivot axis parallel to the longitudinal direction of the first blade, the boom during spraying of liquid to the crops, extending in longitudinal direction perpendicular to the direction of travel of the agricultural tractor, the first blade being longitudinally parallel to the boom,
• a number of nozzles configured for spraying liquid toward the crops, said nozzles are connected to the first blade and are directed in a direction transverse to the longitudinal direction of the first blade, and
• an elongated second blade longitudinally parallel to the longitudinal direction of the first blade, said second blade is mounted above said nozzles and is spaced from and connected to the first blade, which second blade is pivotable about the first pivot axis and/or a second pivot axis parallel to the first pivot axis, and which second blade is pivotable independently of the first blade,
• wherein the second blade is connected to the first blade via a connecting structure, which connecting structure is pivotably connected to the elongated boom thereby being pivotable about the first pivot axis, the first blade being attached to the connecting structure and the second blade being pivotally connected to the connecting structure,
• wherein the second blade is disposed with respect to the first blade such that during travel of the tractor in said direction of travel, air flow in an opposite direction enters between said first and second blades;
• and
• wherein position of said second blade with respect to said first blade is adjustable such that said second blade deflects the air flow above the liquid sprayed by said nozzles such that the liquid sprayed is guided to towards the crops.