Technological process of field crops spraying with slotted sprayers

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BACKGROUND: The subject of the study is the technological process of spraying field crops with slotted sprayers and the indicators dispersion.
 AIMS: Improving the technological process of spraying plants with the use of pneumo-hydraulic slotted sprayers.
 METHODS: Special equipment was used for photographing films of the liquid being sprayed under various operating modes of slotted sprayers with the possibility of calculating the size of the droplets. Fulfillment of the requirements for the number of drops/cm2 at the treated object, overlapping the liquid spray jets ensures uniform distribution of drops over the spraying width. Therefore, it was sufficient to have information about the fragmentation of the thickness of the liquid film along the axis of the nozzle spray liquid into drops and obtaining their quantity per unit time depending on the flow rate of the working fluid.
 Newness of the research lies in determining the effective operation of slotted sprayers as part of the spraying device.
 RESULTS: With the use of the special equipment, it is possible to fulfill agrotechnical requirements for droplet sizes. When using herbicides for foliar post-emergence treatment with a systemic pesticide, the limits of MMD range are from 226 m to 400 m. Soil herbicide treatment with a systemic pesticide requires an increased droplet MMD range of 401 m to 500 m and 500 m. The number of drops/cm2 when using fungicides is limited from 50 to 70, insecticides from 20 to 30, and herbicides from 20 to 40.
 CONCLUSIONS: The applied technology makes it possible to reduce the consumption of preparations and working fluid with high work performance and resource saving. The above research results can be used as the basis for determining the effective technology of a boom sprayer with slotted liquid sprayers. Fulfillment of the requirements for the number of drops/cm2 at the treatment facility overlapping liquid spray torches ensures a uniform distribution of drops over the spraying width. Therefore, it suffices to know about the division of the thickness of the liquid film along the axis of the liquid spray jet into drops and to obtain their number per unit time.