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 the evolution of the angle of the nozzle's jet for sprayers machines according to the working pressure and nozzle angle. 1. INTRODUCTION Agriculture's productivity is influenced by the level of applied work technologies. phyto-sanitary protection occupying a very important place within these technologies. Actual studies and researches regarding methods and equipment for application of phyto-sanitary treatments are framed within the new tendencies for practicing a sustainable agriculture. being a known fact that the phyto-sanitary protection represents one of the main sources of reduction of environment pollution with chemicals [1]. An important aspect of continuum increasing politics of product quality promoted by each manufacturer is represented by both maintaining plants protection machines conformity as also increasing of premises of manufacturing in conditions of repeatability of those products [1. 2]. The purpose of a spraying work is to deposit uniformly a maximum quantity of phyto-sanitary products in the right place (target), respectively on the sprayed surface. The machines working in the field apply treatment plant is a complex process requiring the start of each work preparatory phase that controls the proper functioning of the machine and make adjustments specific job to perform. For the spraying machine in field crops, which generally has as main component parts: tank, stirrer, pump, valves, distributor, spraying ramp, one of the most important part is represented by the nozzles, which influence directly the quality of the spraying process. 2. METODOLOGY For the tests we used a nozzle test bench equipped with pressure gauge, two-port nozzle holders with 5 jets, leakage free system and pump.