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Blue Bags Grow Better Crops

KayNitro® Sulphur

KayNitro® Sulphur 25-0-13 (7SO3) is a True Granular Compound fertiliser ideal for mid and late season application to grass silage.

The product balances large off-takes of Potash where crops are grown on soils high in Phosphate.   It is also a flexible grade for forage maize and arable crops where high Potash/low Phosphate applications are required to balance soil nutrient supply and where biosolids high in Phosphate are used in the fertiliser program.  The addition of Sulphur enhances crop yield and quality in Sulphur-deficient situations.

  • Sulphur is very mobile in the soil and can leach through the soil profile.  Where large amounts are required it is advisable to split the recommended requirement in two applications.
  • Foliar applied Sulphur is a less efficient approach to correcting Sulphur deficiency.  This is because only 2% of the Sulphur is being intercepted and absorbed through the leaf and often these products don’t contain enough Sulphur.
  • The average UK deposition of Sulphur is now negligible compared with the 25kg S/ha/year of 20 years ago.  In fact Sulphur deposition is no longer measured, due to such low levels occurring.
  • Organic manures contain Sulphur, but in variable quantity and availability.  Like elemental Sulphur, most of the Sulphur in organic manures cannot directly be taken up by crops for growth.


GrasslandUse as a general grassland fertiliser on soils with high Phosphate index. For second and subsequent silage crops apply 300-350 kg/ha immediately after previous crop is removed. For grazing, apply 160-200 kg/ha NK Sulphur on a monthly basis following turnout.

With Sulphur, increases in DM yield of 25% can be achieved on light and medium soils, alongside increases of 4% in protein and 5% in sugar contents to improve grass quality and palatability.

MaizeUse KayNitro Sulphur to supplement organic manures on high P index soils as a seedbed fertiliser using 200-300 kg/ha at crop emergence.

ArableUse as a spring top dressing where additional Potash is required to maintain or build soil Potash levels. Apply at a rate that delivers the required Nitrogen.


Ammonium Nitrate is the most efficient and predictable form of Nitrogen for UK growers.

Ammonium Sulphate offers a readily available source of Sulphur to the growing crop.

Water soluble Potash provides rapid uptake to support Nitrogen use efficiency and plant growth.

A True Granular Compound ensures even and accurate spread of all nutrients across the crop.




Contains Ammonium Sulphate

A readily available form of Sulphur for rapid uptake - elemental Sulphur cannot be taken up directly by crops because plants only take up Sulphur in the Sulphate form.

Contains Ammonium Nitrate

AN is the most efficient Nitrogen source and the ‘Best Option for the Environment and Farming’ according to Government research.

Contains water soluble Potash

‘To optimise the benefits of N, it is essential to have sufficient exchangeable Potash in the soil.’ ref PDA March 2008.

A True Granular Compound

Even application of all nutrients across the whole spreader bout width, which optimises nutrient use efficiency and crop response.

Potash applied during the growing season

Reduces autumn workload, and potentially fertiliser application costs on arable crops.  Potash is provided when the crop uses it most efficiently giving better yields and N uptake.

Zero Phosphate content

To fit a range of circumstances where high soil reserves or use of organic manures or biosolids/sewage sludge cake means no fertiliser Phosphate is required.

Manufactured at sites which are accredited to ISO 9001

Reliable product with consistent high quality, every year.


More Yield.  Less CO2

At CF Fertilisers we are committed to improving carbon efficiency in our production processes.  All of our products have a carbon footprint, certified by the Carbon Trust in June 2012 and reviewed annually.

CF Fertilisers has promised to reduce the footprint Nitrogen production, demonstrating an on-going commitment to carbon reduction.

The footprints for fertiliser products are given as kg CO2e per kg Nitrogen (N). Most fertiliser usage is considered on the basis of N requirement, so this allows the simplest comparison between our products for a given crop requirement.

The Carbon Footprint for KayNitro Sulphur is 4.0 kg CO2e per kg Nitrogen. Carbon Trust Logo



CF Fertilisers products spread to 32m bout widths.  Widths of 36m are achievable with certain spreaders and products in suitable conditions, however, please seek advice.  It is important to maintain fertiliser spreaders, whatever bout width you work at.

For optimum results, CF Fertilisers recommends that you follow the industry standard and set up your spreader for both application rate and spread pattern for each different fertiliser that you use. Product Safety Data Sheets are available here.



Product application rate Nutrient application rate
kg/ha N kg/ha P2O5 kg/ha K2O kg/ha SOkg/ha
160 40 0 21 11
200 50 0 26 14
320 80 0 42 22
400 100 0 52 28
720 180 0 94 50
800 200 0 104 56


  • For grass silage, the optimum Sulphur application rate is 40 to 60 kg SO3/ha for 2 cuts and 60 to 80 kg SO3/ha for 3 cuts.
  • For cereals, the optimum Sulphur application rate is 50 kg SO3/ha.
  • For oilseed rape, the optimum Sulphur rate is 112 kg SO3/ha.  If using KayNitro Sulphur then an early application of DoubleTop can be used to supply more Sulphur.
  • To convert from kg product/ha to bags/acre, multiply by 0.4, then divide by 50 (e.g. 250kg product/ha X 0.4 = 100 / 50 = 2 bags/acre)
  • To convert from kg nutrient/ha to units/acre, multiply by 0.8 (e.g. 200kg N/ha X 0.8 = 160 units N/acre)

Please contact our Crop Nutrition Team on +44(0)151 357 5758 or email advice@cffertilisers.co.uk for further information.


Reassuringly BritishCF are the UK’s leading fertiliser manufacturer and the only UK producer of prilled Nitrogen and True Granular Compounds, with a range of NS, NKS, NP, NPK and NPKS fertilisers to meet UK farming conditions.

We manufacture our products to ISO 9001:2000 standards.  That means you can rely on CF Fertilisers to deliver the highest quality fertilisers consistently, every year, giving you optimum product performance and peace of mind.


Optimise fertiliser efficiency with CF Fertilisers specialist Advice and Services such as N-Min and N-Calculator.  Watch our Nitram® vs Urea video- it concisely explains the different Nitram could make to your crops.

For more information on purchasing any of our products or to access our advice and  services then please call our dedicated advice line on +44(0)151 357 5758 or email: advice@cffertilisers.co.uk

Contact us for fertiliser advice, our expert team of FACTS qualified advisers are on hand to provide you with the latest advice in fertiliser management and nutrient plans.