Mainly used in human food, the sunflower seed is valued for the richness of its oil (50 to 55%).

The risks of boron deficiency concern calcareous soils (pH too high) as well as light or compacted soils. Such an induced deficiency can decrease the oil content by 5 points and the crop yield by 7 quintals / ha, or even more!


In order to limit cultural incidents and succeed in obtaining oil-rich sunflower seed yields, the following 3 rules should be observed:

  • Ensure proper emergence and rooting of the crop by positioning a "starter" fertilization and improving the soil structure (fight against threshing).
  • Control nitrogen nutrition by positioning inputs at the optimal stage (from 5 pairs of leaves at the start of flowering).
  • Control any boron deficiency, synonymous with foliage roasting, see loss of the flower head.

Overcoming a boron deficiency and acting on the soil structure to promote the establishment of sunflower is possible by practicing complete fertilization, capable of acting on the various factors potentially limiting the yield and quality of the crop.

For a better production of sunflower

Are you interested in learning more about fertilization solutions for cultivating sunflowers?

The practice of eco-alternative fertilization with the Calkorium and Calkonutrium ranges developed by FCA Fertilisants allows quantitative and qualitative yields to be maintained while limiting the effects of various factors, biotic and abiotic stresses.

  • The prebiotic premix, precursor of biological activity, promotes soil structuring, rooting and hydromineral nutrition of the plant;
  • The natural richness in trace elements of these solutions makes it possible to limit the effect of the induced deficiencies;
  • The development of microflora and in particular the enzymatic activity of certain bacteria (PGPR) makes it possible to make blocked elements available, such as boron.

By fulfilling these three objectives, producers of sunflower seeds see the yield and oil content of their plots improve.