Orchards are sprayed at the agro-technical speed ranging from 4 to 6 km per hour. The research paid attention to the influence of a higher speed reaching 8 km/h on the quality of orchard trees spraying. Applying higher speed causes a labour efficiency increase while spraying and reduces time of treatment performance. However, increasing the speed should not decrease the quality of leaf coverage with the sprayed liquid. The results of the carried out research indicate a possibility of increasing the working speed without deteriorating the quality of spraying in dwarf orchards.

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.

The purpose of applying an additional air flux in field sprayers is limiting liquid drift. The flux also influences the quality of plant spraying. Krukowiak Bravo sprayer, produced by Krukowiak Company, was applied in the research on the influence of air flux on the quality of coverage ofwinter wheat (Sakwa variety). The plant coverage was determined using water sensitive papers. The objective of the experiment was to evaluate the influence of air volume discharged by the air sleeve equipped sprayer and air induction nozzles on the coverage of the plant. The spray coverage ofwheat with ID 120-03 Lechler nozzles was satisfactory, both in case of conventional and air assisted applications.

The quality of wheat spraying obtained while applying drift guard Turbo TeeJet 11 O 02 VP nozzles was tested. A standard boom and a boom equipped with an air sleeve were applied. Krukowiak-Bravo sprayer was used to test the influence of the air flux. The coverage was estimated on water sensitive papers. The spray coverage of wheat with TT 11 O 02 VP nozzles was satisfactory, both in case of conventional and air assisted applications.

The purpose of applying an additional air flux in field sprayers is limiting liquid drift. The flux also influences the quality of plant spraying. Air Plus Spridotrain sprayer, produced by RAU company, was applied in the research on the influence of air flux on the quality of coverage ofwinter wheat (Roma variety). The plant coverage was determined using water sensitive papers.

The subject of the performed experiments comprised standard XR 110 02, XR 110 04 nozzles, TT 110 02, TT 110 04 nozzles and AI 110 02, AI 110 04 air induction nozzles. The working speed of spraying was v_p = 7 km/h. Each nozzle was tested at the following three levels of working pressures: p₁ = 0.2 MPa, p₂ = 0.4 MPa ad p₃ = 0.6 MPa. The spray liquid was pure water at the temperature of 20°C. The plant coverage was determined: s_k – spray coverage, n_k – number of droplets per 1 cm². The analysis of results of maize spraying showed that both standard nozzles and both TT nozzles achieved better results with number of droplets and degree of surface coverage for each of applied operating pressure. The lowest results from all examined kind of nozzles for number of droplets achieved injector nozzles (AI). For operating pressure 0.4 MPa nozzles fulfilled agrotechnical requirements for using insecticids, herbicides and fungicides.

The subject of the performed experiments comprised standard RSMM 110-02, RSMM 110-02 nozzles, AI 110-02, AI 110-02 air induction nozzles as well as AZMM 110-02, AZMM 110-03 low drift nozzles. The working speed during spraying was v_p = 7 km/h. Each sprayer was tested at the following three levels of working pressures: p₁ = 0.2 MPa, p₂ = 0.4 MPa and p₃ = 0.6 MPa. The spray liquid was pure water at the temperature of 20°C. The plant coverage was determined: s_k – spray coverage, n_k – number of droplets per 1 cm² of the leaf.