Within the spraying process, the compact jet of solution which comes out from a limited space, represented by the nozzle's body or sprayer, is transformed in a jet of droplets, through liquid dispersion in space, under a certain angle, at a speed capable to surpass the liquid's forces of internal cohesion. The spraying angle of the jet is the cone's angle formed between the tangents to the jet's contour, concurrent in the nozzle's orifice. The spraying angle, as also the jet penetration, illustrates the liquid's distribution on the surface to spray. This angle depends in a great measure of the nozzle type and its orifice size. The pressure of the liquid has a significant effect on the size of the spraying angle. Within the paper is presented a mathematic model which characterizes the angle of the nozzle's jet for spraying machines in field crops in function of the working process parameters. This model is then experimentally validated through on stand tests which simulate the real working conditions.