The maize biomass sampling at the end of growing season revealed greater silage maize yields in 2014 as compared to 2015. In particular, the highest yield was obtained in field M1, where dry maize biomass ranged between 15.6 and 54.7 t ha-1 (Table 4). Samples showing very low biomass values were observed in M2. In this field the mean silage yield was 26.5 t ha-1. The difference in maize biomass between treatments of uniform blanket herbicide application and patch spraying according to the prescription map were more evident in M1 as compared to M2, but in both fields these differences were not statistically significant (Table 5). In the second growing season, the difference between the two experimental fields (M3 and M4) was less marked than in the first season: the mean maize biomass values across all treatments was 20.3 (t ha-1) in M3 (Fig. 7) and 23.9 (t ha-1) in M4.