A field experiment on winter wheat was carried out in the 2017/2018 - 2019/2020 seasons. The research was carried out at the Podkarpackie Agricultural Advisory Center in Boguchwał, Poland. The experiment was performed in a random block design with four replications. The RGT Kilimanjaro (RAGT Semences) variety was selected for the research. The tested factor were foliar fertilizers used in various combinations: A - Control, B - YaraVita Gramitrel, C - YaraVita Kombiphos, D - YaraVita Thiotrac, E - YaraVita Gramitrel + YaraVita Kombiphos, F - YaraVita Gramitrel + YaraVita Thiotrac, G - YaraVita Kombiphos + YaraVita Thiotrac, H - YaraVita Gramitrel + YaraVita Kombiphos + YaraVita Thiotrac. The combinations of foliar fertilizers used contain quickly digestible micro- (Mn, Zn, Cu) and macronutrients (N, P, K, Mg, S). The best results were achieved by applying foliar fertilization three times (variant H). The increase in grain yield obtained in relation to control (A) amounted to 0.62 t ha-1. Compared to the control, the content of protein and microelements in the grain increased and the fibers decreased. Plant field measurements showed that the SPAD (Soil Plant Analysis Development) and LAI (Leaf Area Index) readings increased after foliar fertilization, but the index MTA (Mean Tip Angle) decreased compared to the control. Regarding the stomata conductivity of leaves (Gs), it was proved that the applied fertilization in variant H resulted in a reduction of this parameter in relation to the control.  

27.3.2022