Blue Bags Grow Better Crops


Use our Frequently Asked Questions to get to the bottom of your query. 

Answer not here? Then please contact the Advice Line on 0151 357 5758 or

Can I graze livestock immediately after fertiliser application?
  • It is advisable to exclude stock for 3 - 4 days following application

How long should I wait to cut grass after N application?
  • In normal growing conditions, to allow maximum response from N applied leave the grassland for 5-6 weeks between application and cutting

Where can I get more information on recommendations?

We hope all the information you require is found on this website however if you have a specific question please contact the Advice Line on 0151 357 5758 or fill in the form below.

Why isn’t the price of fertiliser coming down if the price of oil & gas is coming down?
  • Commodities, whether cereals, milk or fertiliser have price determined by supply and demand not cost of production. Low energy costs will result in higher production globally, which should increase supply and generally lower fertiliser prices assuming demand doesn’t increase. This has been happening generally in the UK market over the last 4 years.

What are benefits of UK products over imported products?

Imported products

  • Nitram has been proven and trusted by GB farmers for 50 years

  • The best quality, consistency and spreadability available

  • Available in 600kg and 1000kg bags

  • Carbon Trust accredited

  • Supported by a company committed to R&D in the GB market

  • Specialist advice available from a team of FACTS qualified advisors

How much of your fertiliser should I use on my roses / lawn / vegetables?

Use sparingly, our concentrations are much higher than the fertilisers you will buy in the garden centre.  As a rule of thumb 1 oz to the square yard will not be far away.  Easier to apply a little more than hide the burn marks.  On the lawn be careful to spread evenly to prevent striping.

How long should I keep my horse / sheep / alpaca off the field after spreading?

There is no fixed period for removing livestock.  The main concern would be direct ingestion.  The granules are very soluble and rain, or heavy dew, will dissolve them into the soil moisture.  The granules will fall below the grazing height of the animals.  One thing to watch out for would be spillages from the bag or spreader, for example at the gateway.  These should be cleared away before the animals return to the field.

How often do I need to do soil analysis?
Is EnCompass compliant with NVZ regulations?

CF Fertilisers Encompass is compliant for England and Wales. For recommendations in Scotland, please contact CF Fertilisers on the advice line 0151 357 5758

Will N-Min tell me the N that will become available to my crop as well as what is available at the time of sampling?
  • CF Fertilisers N-Min is a unique service which does just that. A patented laboratory procedure determines the additionally available Nitrogen (AAN) ie Nitrogen that will be mineralised and available to the crop during the growing season.
Does N-Calculator give rates and timings for N applications?
  • CF Fertilisers N-Calc works in conjunction with N-Min, and will give detailed recommendations for Nitrogen and Sulphur rate and timing, with interpretation by our FACTS qualified team of advisors.
Will Nitram spread to 36m?
  • Nitram can be spread to 36 metres, in suitable weather conditions (if it’s too windy to spray, it is too windy to spread at wide widths) through an appropriate spreader calibrated to ensure correct width setting. Clearly with any fertiliser, the wider the spreading width the more the need for spreader accuracy and correct weather conditions.

What are the closed dates for applying slurry and N fertiliser in NVZs?
  • Closed periods during which high available N organic manures should not be applied

 Grassland  Arable
 Sandy or shallow soils Other soils Sandy or shallow soils Other soils
 1st Sept- 31st Dec  15th Oct- 31st Jan  1st Aug- 31st Dec  1st Oct- 31st Jan
Do CF Fertilisers products have a Carbon (kg Co2e/Kg) N figure that I can give to processors?
Where can I buy your fertiliser?
  • CF Fertilisers products are sold through a range of National and local distributors, contact the Advice Line on 0151 357 5758 for further details.

What determines the price of fertiliser in the UK?
  • While CF Fertilisers is the last remaining primary manufacturer of fertiliser in the UK, over half the market is serviced by imported N, P, K and Sulphur. UK prices are driven primarily by Global and European price trends.

When is the best time to buy my fertiliser?
  • For Nitram, June has been the best time to buy in 12 out of the last 15 years. For compounds, October is generally the start of the buying season. Availability of storage and cashflow will determine individual circumstances.

Can I purchase your fertiliser 1, 2, 3 years ahead?
  • There is no established futures trading mechanism for fertilisers as there is in grain. CF Fertilisers fertilisers are usually available on a spot basis or forward 2/3 months.

Do CF Fertilisers offer deferred payment for their fertiliser.
  • GROWPLAN credit facilities are available for CF Fertilisers fertilisers through our approved distributor network with a range of repayment options (offered in conjunction with Hitachi Capital Business Finance). For further information call the advice line on 0151 357 5758

Why should use a compound and not a blend?
  • Efficient use of fertiliser depends on accuracy of application which in NPKS compounds is largely dependent on the product spread. CF Fertilisers compounds are all granulated products with each nutrient present in each granule giving accurate spread. Blended products have components with different sizes and densities which cannot avoid separation when handling and spreading leading to inaccurate application.

  • View new R&D research based in a grassland situation.
What R&D is CF Fertilisers involved with?

CF Fertilisers has an ongoing programme of R & D projects for both grassland and arable. These can be specifically CF Fertilisers trials, or operated in conjunction with other industry stakeholders. For full details see our Research and Development reports.

What are the N max limits for various crops?
  • Current N-Max limits are as follows and include available N applied as manures.


N max limit (kg N/ha)

 Wheat, autumn or early winter sown  220
 Wheat, spring sown  180
 Barley, winter  180
 Barley, spring  150
 Oilseed Rape, winter  250
 Sugar beet  120
 Potatoes  270
 Forage Maize  150
 Field Beans  0
Peas 0
Grass 300


Is CAN less acidifying than AN?
  • CAN, which has Calcium Carbonate as a filler, is less acidifying than AN, but will usually cost more per kg N even when the cost of liming as a separate exercise is added in, and if Nitram is used liming can be more targeted.
Why shouldn’t I use urea as it is cheaper source of N per kg?
  • Urea was developed as a cheap product to produce and transport across the globe. It was not developed for agronomic reasons and is globally recognised as an inefficient source for growing crops. Ammonium Nitrate was developed with agronomic benefit as the driver, and has been repeatedly proven to be the most profitable product for GB farmers, justifying the higher cost per kgN.

  • See new R&D based in a grassland environment.
Do CF Fertilisers products use Abated N?

Yes, state-of-the-art nitrous oxide abatement technology on the Nitric Acid plants, removes over 90% of the N2O produced during nitric acid manufacture, resulting in lower carbon abated Nitram and NPK(S) Compounds.

Will sulphur benefit grazing/cutting?
  • Declining Sulphur deposition is leading to significant responses in yield and quality in grassland. Responses should be seen in most circumstances but especially in mid season silage with a very short growing period between cuts.

How much S should I use?
  • Clearly different situations require different levels of sulphur, but the following are guidelines for main crops. Sulphur is usually expressed as SO3, if elemental S is measured divide SO3 by 2.5 ie 50kg/ha SO3 = 20kg/ha S

  • Wheat / Cereals 40-50kg/ha SO3
  • Oilseed Rape 80-100kg/ha SO3
  • Grazed Grass 40-70kg/ha SO3
  • Cut grass 50-80kg/ha SO3

Use our product selector to find the right product for you.

Elemental S is a cheaper way of applying S?
  • Elemental may be cheaper, but is not the form of S taken up by the crop. Even if Sulphur is sprayed on a crop, it still has to be washed off, mineralised to Sulphate and taken up by roots. Sulphate is far more efficient as Sulphur source.

Why use Sulphur for grass/cereals?
  • Sulphur is the 4th major plant nutrient without which a number of key plant functions will fail, eg Protein synthesis, Chlorophyll production. Atmospheric deposition of Sulphur is now negligible, so for yield, protein levels, Sugar levels in grass – additional fertiliser Sulphur is essential.

Should I avoid applying K on grazing ground in the Spring?
  • The influence of Potassium in locking up Magnesium availability, particularly in spring, can lead to grass staggers (Hypomagnesaemia). Potash applications are undoubtedly needed, but heavier dressings are best delayed to mid season.

Does early season P have a beneficial effect on grass growth, even at P index 2?
  • Phosphate response is generally greatest applied as water soluble P and applied in spring. Due to the immobility of P in the soil and availability of moisture in spring, you can often get a yield response even at index 2