Abstract: An apparatus and method are disclosed for the aerial spraying of agricultural chemicals with improved spray deposition and reduced drift. The spraying apparatus includes two oppositely charged sets of spray nozzles which may be fitted onto an aircraft. Both sets include one or more nozzles having spraying tips which produce a hollow cone spray pattern, and at least the tips of these nozzles are constructed of a substantially non-conducting material. Cylindrical electrodes are positioned concentric to the nozzle tips for inducing an electrostatic charge upon liquid spray emitted from the nozzles. The electrodes are in turn connected to high voltage power supplies, with the electrodes corresponding to the first nozzle set being connected to a power supply of opposite potential than the electrodes corresponding the second nozzle set. Consequently, the spray issuing from the nozzle sets will be oppositely charged.

Abstract: An apparatus and method for measuring agricultural spray deposits and maximum liquid formulation retention on plant leaf surfaces are disclosed. The apparatus includes a first chamber having an annular seal mounted thereon which defines a first cavity, and a second separable chamber also having an annular seal thereon defining a second cavity. Each chamber also includes at least one access port communicating with that chamber's respective cavity, and are aligned with their annular seals juxtaposed in an opposable relationship. Releasable force application means are also provided for forcing the chambers together with the seals in an abutting relationship. In use, a leaf of the target plant is inserted between the annular seals and the chambers are forced together, retaining the leaf between the seals and forming first and second accessible compartments defined by the leaf and the cavities of the first and second chambers, respectively.