The Airjet bi-fluid nozzle mixes air with the spray solution inside the nozzle to atomize the spray. The AirJet can produce droplets of consistent size at a wide range of flow rates. Unlike conventional nozzles, the Airjet will not change droplet size as rates and pressures change. The quality of wheat spraying obtained while applying AirJet TK-VSlO nozzles was tested. The coverage was estimated on water sensitive papers. Nozzles were used at the liquid pressure: 0.22; 0.28; 0.35 MPa and air pressure: 0.07; O.OS; 0.09; 0.1 MPa. Relatively low spray volumes 90 I/ha, 11 O I/ha and 150 I/ha were obtained at constant working speed of 6 km/h.

Two formal types of models of living processes, especially evolutionary ones, may be distinguished: the well-known mathematical type and the less-known logical one. The latter applies the terms “class” or “set”; both the terms are understood either in a collective sense (in mereology) or in a distributive sense (in set theory). These formal terms may be used among others to such organic multiplicities as populations or species of organisms, and to organic constituents (molecules, cells, organs) of living organism. Collective concepts refer to objects existing in nature, whereas distributive concepts refer to the linguistic and research constructions of models of natural objects, developed to cognitively grasp natural regularities.