Rationale for the elements of a mechanized operation and a sprayer type for killing weeds with a herbicide in raspberry rows

The agrotechnology of weed killing in raspberry rows is poorly mechanized in Russia. Unlike in other countries, herbicides are not typically applied in the raspberry rows. Therefore, there has been little study of the design parameters and operating modes of sprayers used for killing weeds chemically in raspberry rows. The authors used a distribution trial unit for carrying out experiments to evaluate the liquid deposition uniformity of various types of sprayers along working width, depending on the installation height, tilt angles and wind speed. The experiments were carried out in the laboratory conditions of Bryansk State Agrarian University and All-Russian Institute of Plant Protection, St. Petersburg-Pushkin. The coefficient of variation was used as an indicator of the liquid deposition uniformity over the working width of the sprayer. It has been established that the IS yellow slot sprayer is the most rational option in terms of geometric parameters of the formed drip torch and spray dispersion. Changing the height of the sprayer installation from 0.1 to 0.7 meters leads to a decrease in the coefficient of variation from 68 to 10%, depending on the wind speed. An increase in the angle of inclination of the sprayer towards the airflow at a height of 0.3 to 0.7 meters leads to an increase in the coefficient of variation, and in the height range of the sprayer from 0.1 to 0.3 meters – to a slight decrease in the coefficient of variation. The influence of the considered factors on the coefficient of variation is nonlinear, which suggests the existence of a global extremum and the need for further tests.

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