Nitrogen Use Efficiency in UK Farming – CF Fertilisers Insight

This document presents a detailed overview of nitrogen fertiliser use efficiency (NfUE) trials carried out by CF Fertilisers, led by company agronomist Dr. Sajjad Awan. Shared as part of the MGA Conference materials, the presentation explores how growers can improve nitrogen use to boost profitability while reducing environmental impact.

The trials, conducted across UK farms during the 2020/21 season, aimed to answer a key question: is it worth measuring Soil Nitrogen Supply (SNS)? By comparing traditional estimation methods (like RB209) with the CF N-Min Test, the trials evaluated nitrogen recommendations in winter wheat and oilseed crops to determine how accurately fertiliser needs can be predicted—and how much waste could be avoided.

The results highlight the importance of matching nitrogen application to crop demand. When fertiliser is applied too early, too late, or in excess, it leads to poor uptake, higher environmental losses, and reduced financial returns. The CF N-Min Test, combining measurements of Soil Mineral Nitrogen (SMN) and Additionally Available Nitrogen (AAN), offered significantly greater accuracy in predicting fertiliser needs compared to other commonly used methods.

Trial outcomes showed that nearly 75% of participating farms reduced their nitrogen inputs without sacrificing yield, resulting in improved NfUE, lower CO₂ emissions, and an average saving of £40 per hectare. The presentation also touches on fertiliser strategy under high price conditions and provides recommendations for managing phosphorus and potassium in silage maize.

This presentation is highly relevant for farmers, agronomists, and advisers looking to make more informed, sustainable decisions around nitrogen use. It makes the case for using data-led tools like the CF N-Min test to improve both farm performance and environmental stewardship.

Conference Paper - Soil N Testing.pdf

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