Biostimulanter til udnyttelse af kvælstof

Conclusion

The purpose of this trial activity was to test new biostimulants in sugar beets and evaluate their effect on sugar yield.
The yield analysis of the interactions between N levels and biostimulants in the NBR trials showed that the biostimulants BlueN (late application), Kinsidro Grow+ in combination with BlueN, and Stimplex resulted in a significant yield increase at high N levels compared to the untreated control (0.57–0.65 t/ha yield increase). Early application of BlueN, on the other hand, did not result in a significant yield increase, with only a 0.27 t/ha improvement. At moderate or low N levels, no yield increases were observed with the application of biostimulants. Furthermore, there were no significant differences in sugar yield between early and late applications of BlueN or when combined with Kinsidro Grow+. NDVI measurements showed a clear response to N levels but no clear effect of the biostimulants.
Results from the COBRI trials showed that the effect of BlueN and Vixeran varied considerably across individual trials, and the overall effect was generally uncertain across the three N levels. However, some positive trends were observed.
The growth conditions in 2024 were optimal for high nitrogen mineralization in the soil, which may help explain the yield reductions observed in the untreated plots in both the Danish NBR trials and the Belgian trial at high N levels. However, with only one year of trial data and significant variation across locations, it is too early to conclude whether there is a real and consistent effect of biostimulants on nitrogen utilization in sugar beets.