Values of determined qualitative parameters of food wheat grains (bulk density, falling number, protein content, gluten content and sedimentation index) were different according to the cultivation years; statistically significant difference has been proved between years. No statistically significant difference was observed between values of the grain qualitative parameters of plants treated with brassinosteroids or untreated. Average values of qualitative parameters of wheat grains in individual years are reported in Table 8.

1.4 Yield of wheat grain after BRs treatment (field experiment)

Yield of grain and values of thousand-grain weight (TGW) were different during the investigated period; a statistically significant difference between years was demonstrated. In 2005, an increase of TGW was determined in all treated variants. The yield per hectare decreased by 6.9% in the variant treated with 24-epiBL. In 2006 and 2007, no difference between grain yields of control and treated plants was observed. No difference was found also between TGW values. Average grain yields and TGW values are given in Table 9.