## 3 Results  
### Laboratory Experiment--The Influence of Wetting Agent and Nozzle Type on Copper Hydroxide Deposit  
During the application of solution with only copper hydroxide at a rate of 2 kg ha\({}^{-1}\), 66.24% of the solution was deposited on the leaves when treated with nozzle type SF and 87.60% using the nozzles TD ADF. The tracer recovery rates are presented in Table 1.  
When copper hydroxide was used in a mixture with a wetting agent at a rate of 0.3 L ha\({}^{-1}\) the measured deposit on the leaves was 68.28% when applied with SF nozzles. When the concentration of the wetting agent was doubled, the deposit of the solution reached 84.77% and was statistically higher compared to the first two treatments with SF nozzles (\(p<0.05\), F = 5.65). Additionally, the increase of the dose of the wetting agent to 1.0 L ha\({}^{-1}\), resulted in the increase of the deposit to 92.50% when the SF nozzles was used, and to 93.83% when the TD ADF was used (\(p<0.05\), F = 4.22).  
After the rain simulation (15 L m\({}^{-2}\)), the deposit significantly decreased (\(p<0.05\), F = 7.8) due to flushing. When applied without a wetting agent, 5.43% of the copper  
\begin{table}
\begin{tabular}{c c c c c c} \hline
**Type of Nozzle** & **Treatment I** & **Treatment II** & **Treatment III** & **Treatment IV** & **F Ratio** \\ \hline \multicolumn{6}{c}{Deposit Before the Rain (\%)} \\ SF & 66.24  & 68.28  & 84.77  & 92.50  & 5.65 \\ TD ADF & 87.60  & 87.82  & 91.36  & 93.83  & 4.42  & 4.22  \\ CV* SF & 5.69 & 5.73 & 3.04 & 1.78 & \\ CV* TD ADF & 1.93 & 3.04 & 6.17 & 2.46 & \\ \multicolumn{6}{c}{Deposit After the Rain (\%)} \\ SF & 5.43  & 25.00  & 45.33  & 57.00  & 7.88  & 7.85  & 7.65  & 46.43  & 55.21  & 73.33  & 3.66  & 3.66  & 3.66  & 19.56 & 8.18 & 6.30 & 9.41 & \\ CV* TD ADF & 19.09 & 5.91 & 8.80 & 1.40 & \\ \hline \end{tabular}
\end{table}
Table 1: Tracer recovery rate on sugar beet leaves before and after the rain using SF and TD ADF nozzles in the laboratory test.  
hydrooxide solution remained on the leaves. When adding the wetting agent (0.3 L ha\({}^{-1}\)), the deposit increased (25%) when the SF nozzles were used. A higher dose of the wetting agent resulted in a higher deposit on the leaves, so when 0.6 L ha\({}^{-1}\) of wetting agent was used, 45.33% of solution was detected on the surface of the leaves in treatment with SF nozzles and 55.12% in the case of TD ADF. In the laboratory conditions, the quantity of the deposit significantly differed depending on the type of nozzles. It can be estimated with 95% of certainty that the TD ADF nozzles statistically is increased the deposit compared to SF nozzles (\(p<0.05\), F = 3.66). The quantity of the deposit when TD ADF was applied in the laboratory conditions varies from 87.6% to 93.83%. Moreover, under the conditions of artificial rain, the application of copper hydroxide with the addition of a wetting agent at all rates (0.3, 0.6, or 1 L ha\({}^{-1}\)) increased the deposit in the case of both nozzle types (Table 1). Treatment with TD ADF nozzles with the addition of different wetting agent rates increased the deposit after rain simulation from 46.43% to 73.33%. In the treatment with copper hydroxide without a wetting agent, the deposit of hydroxide solution was significantly lower (7.65%).  
The application of the solution based on copper hydroxide without wetting agent, after the rain, shows a very low quantity of the deposit and an unacceptably high CV of 19.56 for SF nozzles and for TD ADF that is 19.09%. However, on the other side, these values of CV are unexpectedly low because they were measured in dynamic conditions during the spraying. This CV shows a very good transverse spray distribution of fungicide during spraying because many horizontal and vertical boom movements have an impact on nozzle transverse distribution.