Applying microelements to optimise sunflower (Helianthus annuus L.) nutrition | Optimalizace výživy slunečnice mikroelementy
2009
Škarpa, P., Mendelova zemědělská a lesnická univ., Brno (Czech Republic) | Richter, R. | Kunzová, E. | Zukalová, H.
In a two-year field trial established in 2006 and 2008 in the local area of the agricultural enterprises Ostrožsko and Žabčice we explored the effect of applications of foliar fertilisers containing micro-elements (B, Mn, Zn and Mo) on the chemical composition, yields, oil content and oil production of sunflower (Helianthus annuus L.). The effect of foliar nutrition applied in the stage of the 6th true leaf on the chemical composition of sunflower leaves was evaluated 13 and 11 days after the application. While the content of macrobiogenic elements in the fertilised variants was balanced, the level of micro-elements increased in dependence on the applied nutrient, particularly in the leaves. Foliar nutrition had no effect on the level of microbiogenic elements in the stems and flower heads. Foliar dressing of the plants with boron, manganese and zinc increased the yields of achenes by 2.9-15.0%. The significant increase of the achenes yields were detected after molybdenum application. The oil content ranged between 46.3 and 49.1%. Since the oil content in the variants of fertilisation was balanced, oil production was dependent particularly on achene yields.
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