## 3 Results and Discussion
As the lateral wind velocity increased to \(v\) = 4 m s\({}^{-1}\), spray drift was observed up to 9 m, and in the case of the control, up to 12 m from the spray zone (Figure 11). It can be observed that the coverage in the spray zone is lower than it was when the lateral wind velocity was \(v\) = 2 m s\({}^{-1}\). The water spray coverage of the artificial plants at \(v\) = 4 m s\({}^{-1}\) lateral wind velocity was 54.5% compared to 67.2% in the previous case (18.9% reduction in coverage). As the lateral wind velocity increased from \(v\) = 2 m s\({}^{-1}\) to \(v\) = 4 m s\({}^{-1}\), the spray coverage of DRA1 decreased from 82.1% to 74.0% (a decrease of about 9.9%), of DRA2 from 84.9% to 73.6% (a decrease of about 13.3%), and of DRA3 from 74.4% to 62.8% (a decrease of about 15.6%). However, DRA increased the coverage by droplets of sprayed liquid compared to the control case. DRA1 increased the coverage in the spray zone by about 35.8% compared to water, DRA2 by about 35.0%, and DRA3 by about 15.2% compared to water. The increase in lateral wind velocity reduced the spray coverage of the spray zone but increased the spray drift. The greatest change is seen in the row of artificial plants 6 m from the spray zone. While at \(v\) = 2 m s\({}^{-1}\) the coverage of the artificial plants at 1 m from the ground was 2.1%, this increases to 7.8% (about 3.7 times) during the spraying process with a lateral wind of 4 m s\({}^{-1}\). In addition, no droplets could be found on the artificial plants at 1 m height using DRAs, but they were present on the WSP at 0.5 m height from the ground. The coverage of DRA1 droplets was 0.4% (19.5 times lower than water), the same value for DRA2, and 1% for DRA3 (7.8 times lower than water). In terms of the effectiveness of DRAs, it can be noted that DRA1 and DRA2 yielded identical results at 6 m and 9 m from the spray zone, whereas DRA3 differed from them. Spray coverage at 6 m and 9 m from the spray zone was 2.5 and 3 times higher than DRA1 and DRA2. However, the difference between the formulations was smaller in the row of artificial plants at 3 m from the spray zone. While the difference between DRA1 and DRA2 was very small at 0.1 percentage points (DRA2 was about 1% higher coverage), the droplet coverage of DRA3 was about 35% higher than that of DRA1. The next tests of spray coverage and spray drift by the agricultural spraying robot were carried out at a lateral wind velocity of \(v\) = 6 m s\({}^{-1}\). When spraying at a height of 1 m from the ground, it can be observed that the sprayed droplets were carried 12 m away from  
Figure 11: Artificial plant coverage with spray droplets at 0.5 m height and spray drift during the spraying process under \(v\) = 2 m s\({}^{-1}\) and \(v\) = 4 m s\({}^{-1}\) lateral wind. the spray zone, and up to 15 m for water spraying (Figure 12). The results also show that the spray coverage of plants in the spray zone is lower than in the adjacent row (3 m from the spray zone). In the case of water spraying, the spray coverage was 2.1% in the spray zone and 5.3% at 3 m from the spray zone (about 2.5 times higher coverage). The difference between the results obtained when spraying with DRA solutions is slightly smaller. In the spray zone, the spray coverage of the DRA1 solution was 2.3%, 2.4% for DRA2, and 2.4% for DRA3, while at 3 m, DRA1 coverage was 2.7% (about 14.8% higher coverage), DRA2 coverage was 3.5% (about 31.4% higher coverage), and DRA3 was 2.7% (about 11.1% higher coverage). It can also be noted that the application of the formulations no longer has a significant effect on the coverage since the results obtained differed from the control spray by only 0.2 (about 8.7% increase in coverage) and 0.3 (about 12.5% increase in coverage) percentage points. The effectiveness of the DRAs used in the tests is more evident in the spray drift results. In terms of spray coverage in a row of artificial plants, 3 m from the spray zone, DRA1 and DRA3 solutions had spray coverage about 2 times lower than water, and DRA2 about 34.0%.