Fibrophos Handbook 2015

23 / 52

21
Secondary Elements in Fibrophos 5
Fibrophos fertilisers contain a
wide range of secondary nutrients
and important trace elements in
significant quantities.
Furthermore, chemical analysis
has shown that those released
are in forms available to plants.
Conclusion
“The sulphur in Fibrophos is as readily available as that in Ammonium
Sulphate or Calcium Sulphate”
Ian Richards, Soil Agronomist
OBJECTIVE AND METHOD
Levington Agriculture Ltd Ian Richards
Fibrophos was assessed as a source of sulphur in comparison to ammonium sulphate,
calcium sulphate, and Tiger 90 (sulphur/bentonite).
Leaching was assessed in a bare soil over winter and was subsequently planted with
ryegrass to measure uptake of residual sulphur.
Two replicated trials on two light textured soils of relatively low sulphur status were used.
Soils were brought to field capacity and leached by fortnightly applications of
demineralised water over winter.
In both trials the available sulphur was leached from ammonium sulphate, calcium
sulphate and Fibrophos. Tiger 90 was not leached nor picked up in the soil analysis.
Fibrophos as a source of Sulphur
Sulphur is essential for crop growth
and the amount needed is roughly
half that of phosphate.
Fibrophos contains good levels of
sulphur - typically 8% S03. With
sulphur deficiencies now widespread,
Fibrophos is able to significantly
reduce the risk of deficiency -
improving both yield and quality in
many cases. Regular applications
of Fibrophos will supply most of
the sulphur required for most
situations. Oilseed rape and brassica
crops respond particularly well to
high levels of sulphur in Fibrophos.
Sulphur up to 8% as SO3