Trials were carried out on ryegrass grown on three soils, two low in phosphate and one low in potassium to which a range of fertilisers and Fibrophos were added. Grass yield and herbage nutrient content showed that both the phosphate and the potassium in the Fibrophos are very largely available to the crop within a short period after application.

It is likely that any residual phosphorous and 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 Fibrophos either annually or in larger dressings every three years for nutrient maintenance purposes.

Grass rarely suffers from trace element deficiency but the herbage may contain too little copper and selenium to meet livestock needs. The additional trace elements in Fibrophos provides that peace of mind.

As a long lasting source, Fibrophos is ideal for raising the soil phosphate and maintaining it. Used for this purpose when soil phosphate is 0 or 1, Fibrophos can be applied at 625Kg/ha every two to three years depending on crop potential. This will provide an adequate level of phosphate to ensure full effectiveness of applied nitrogen.

While Fibrophos is not sold specifically as a liming fertiliser it has a useful liming value of 15% as CaO.

Magnesium in Fibrophos

Magnesium improves the feed value of grass and inadequate supplies can lead to grass tetany. Regular applications of Fibrophos (typically 5 MgO) maintain good levels of magnesium in the soil, thus reducing the risk of staggers. The effects of the antagonism between magnesium and potassium are greatly reduced where Fibrophos is applied.

Sodium in Fibrophos

Sodium dramatically improves the palatability of grass and helps to maintain healthy pastures. Cattle and sheep have been seen to favour pastures where Fibrophos is applied and the feed content of the grass is enhanced. Trials were carried out to demonstrate the uptake of magnesium and sodium by herbage from Grassland.


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Fibrophos is an effective PK fertiliser and can be used as a substitute for conventional fertilisers in nearly all arable situations.

Extensive trials on a range of arable crops have shown Fibrophos to be as effective as triple super phosphate and muriate of potash (MOP). Furthermore Fibrophos compares well to conventional fertilisers across a range of soil pH's unlike phosphate rock which requires acidic conditions.

Selwyn Richardson (ex ADAS) concluded that the Phosphorus in the product "was 90-100% as available as that in Triple Superphosphate within the first growing season after application. At high soil pH it as effective as Basic Slag and superior to Rock Phosphate"

With regard to the Potash he further concluded that "the Potassium content is very quickly available and it appears to be 90-100% as effective as that in Muriate of Potash."

The trials concluded that any residual Phosphorus or Potassium unused in the first season will remain or become available to plants in the longer term. Further concluding that it would be a valuable fertiliser for all cereals, oilseed rape, peas, beans, linseed and many other crops.