Efficiency of Boron Applications in Oilseed Rape

The aim of the pot trial with oilseed rape (Brassica napus L.) was to determine the efficiency of boron application. Vegetation experiment was established in climabox of Department of agrochemistry, soil science, microbiology and plant nutrition on Mendel biotechnology pavilion, Mendel University in Brno. The experiment included the treatments with foliar application of fertilizers Borosan Forte (with and without wetting agent), Borosan Humine and boric acid and soil supplementation of ammonium sulfate with boron. The dry weight of plant increased most after application of Borosan Forte with a wetting agent, boric acid inhibited the growth of plants. Increase of the boron content in plant statistically highly correlated with the weight of the fertilizer solution adhering on the plant (r = 0.907). The adhesion of the fertilizer solution on over ground biomass was increased more than 2.5-fold after application Borosan Forte with wetting agent. The percentage of foliar applied boron that was absorbed into plant ranged from 12 (Borosan forte) to 16% (Borosan Humine) of the applied dose. Absorption of boron, which was applied with boric acid, was very low (1% of the total dose). More than 70% of the soil applied boron was uptake by plant.