Method and pneumatic device for reduction of coalescence of drops in spray cones of liquid in plant protection

To reduce the coalescence activity of drops in the slot spray cones of working fluid, a method of injecting of air jet by pneumatic device with subsequent transporting of air-and-drop flow to the plants is proposed. Reducing of coalescence of drops is proved by comparative data on the density of the covering of record cards using the developed method and traditional one. In case of the developed method, the spraying is carried out by means of pneumohydraulic devices at average unit speed of 19 km/h. In this case, the number of small and medium drops with trace diameters from 0 to 150 micrometers is increased, and the number of drops larger than 300 micrometers is decreased. With the average unit speed of 15.5 km/h and operating width of single pneumohydraulic device of 300 cm, the spray material consumption is 16.26 cubic decimeters on 1 hectare. In the traditional version of arrangement of sprayers on the boom at a pitch of 50 cm and motion speed of tractor unit of 14.8 km/h, the spray material consumption is 51.1 cubic decimeters on 1 hectare, which is by 3.14 times more than in case of the developed method. The advantage of the developed method of drops application on the treatment objects lies in the fact that the outer part of air jet emerging from the nozzle of pneumohydraulic device prevents the entrainment of drops into the environment. The results of these studies and laboratory tests are the basis for further research and practical application of economical, eco-friendly and high-performance technologies of use of pesticides in crop production.

coalescence, drops, sprayer, spray cone of liquid