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      By Matthew TiltSeptember 1, 2025
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    Arable & Livestock

    Spreader calibration is more important than ever

    Matthew TiltBy Matthew TiltNovember 4, 20213 Mins Read
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    Photo 4

    Record gas prices have led to UK and European nitrogen producers reducing or turning off production facilities. This, coupled with strong global demand, means that imports to British farmers are likely to come from a wider range of manufacturers than normal and potentially be more variable in size and spreading characteristics.

    Origin Fertilisers and Spreader & Sprayer Testing Ltd (SCS) are advising farmers to properly calibrate their machines to get the best return from these valuable nutrients. Origin Fertilisers has focused on securing new supplies of both calcium ammonium nitrate and ammonium nitrate for its 12 UK sites to secure adequate supplies for UK farmers and growers

    Each year, British farmers use around four million tonnes with 25% manufactured domestically, 60% imported from Europe and around 15% imported from the rest of the world. Even if growers reduce their nitrogen application in line with RB209’s economic optimum, more imported product is likely to be needed.

    “Normally, Origin purchases nitrogen from suppliers where we have existing long-term partnerships and supply our customers with tried and tested products,” explained Michael Pater, Origin Fertilisers’ managing director. “However, with many curtailing production and strong demand from their home and emerging fertiliser markets, we have had to secure supplies from further afield to ensure a continued supply of nitrates for our customers.”

    Importing from a wider array of companies may lead to increased variability in granule colour, size, density and crush strength and farmers are being advised to check and calibrate their spreaders for delivery, especially if these deliveries span several weeks.

    Origin Fertilisers is working alongside SCS to help gain a better understanding of the characteristics of imported nitrogen. While an off the shelf spreader setting may not be possible for the analysis delivered to farm, the companies note that understanding the characteristics of the raw material will help SCS give more informed advice.

    Explained SCS’ Rob Foxall: “Farmers spend thousands of pounds buying essential nutrients for their crops, and then don’t necessarily spend a comparatively small amount to find the optimum application settings.

    “With the high value of fertiliser this year, and potentially more variable in size and characteristics than previous years, setting the spreader correctly will give farmers the best return on an expensive investment.”

    SCS is part of the National Fertiliser Spreader Testing Scheme and offers a range of services to help farmers set their spreaders correctly, including a member of the team visiting the farm to help growers test their machines.

    The company offers four parts to every spreader test:

    • An MOT style test involving a thorough examination fo the machine and all its working parts
    • A check of the fertiliser characteristics, including bulk density, crush strength and size, which determine how the product spreads and can identify variation between batches
    • A full-width tray test with material being collected and a coefficieint of variation calculated. Tray testing is completed until an acceptable spread pattern is achieved
    • A detailed report of the findings.
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    Matthew Tilt
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    Machinery editor for Farm Contractor & Large Scale Farmer. Matt has worked as an agricultural machinery journalist for five years, following time spent in his family’s Worcestershire contracting business. When he’s not driving or writing about the latest farm equipment, he can be found in his local cinema, or with his headphones in, reading a good book.

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