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Potash in Fibrophos
4
“It is likely that any residual potassium unused in the first season will
remain or become available to plants in the longer term. Thus Fibrophos is
a very effective fertiliser for grass and it can be assumed with confidence
that it would be equally valuable for cereals, oilseed rape, peas, beans,
linseed and many other crops.
It would be appropriate to apply the product either annually or in larger
dressings every three years for nutrient maintenance purposes.”
Selwyn Richardson,
ADAS
Soil solution K
Exchangeable K
K in clay mineral lattices
Uptake
Return of residues
following consumption
by man and animals.
Note that the
majority of K is in
urine and is soluble.
Some K may be
lost via the root
system as plants
reach maturity
The potassium cycle
K fertilisers
Fixation
Weathering
K in living plants