N-Check: The essential step before drilling spring sown cereals and maize
NRM
Agriculture
As spring approaches, advisors and farmers turn their attention to establishing spring-sown cereals and maize — crops that rely heavily on early nutrient availability to drive root development, canopy formation, and yield potential. With a much shorter growing season than winter cereals, these crops must get away quickly, making the timing of nutrition absolutely critical.
In practice, this often means nitrogen is applied at drilling or at early emergence, particularly in spring barley, where early nitrogen helps support establishment while managing the risk of excess nitrogen ending up in the grain for malting crops. The challenge is that the entire nutrient window for spring crops is compressed, leaving far less flexibility in timing and underscoring the importance of getting nitrogen management right from the outset.
One of the most influential (and often overlooked) factors in getting spring nutrition right is the amount of soil mineral nitrogen (SMN) present at the time of drilling. This is why N‑Check sampling must be the starting point for any spring nutrient plan. By establishing the true baseline nitrogen supply before any fertiliser or organic manure is applied, nutrient management plans can be built on accurate data rather than assumptions.
Why soil mineral nitrogen matters in spring cropping
Spring-sown crops rely heavily on early nitrogen, and the supply already present in the soil can play a major role in supporting initial growth. However, the amount of SMN available at drilling can vary significantly between farms, fields, and within individual fields. SMN supply is influenced by soil type, soil temperature, over-winter rainfall, previous cropping, and organic matter turnover. Without accurately measuring this starting point, spring crops risk being either over- or undersupplied with nitrogen, both of which can restrict early development, reduce nitrogen use efficiency, and ultimately limit yield potential.
Our N-Check analysis packages provide a field-specific assessment of the amount of SMN in the soil depth sampled. This allows advisors to base supplementary nitrogen applications on what the soil will actually supply rather than relying on assumptions or RB209’s field assessment method. It is crucial, however, that sampling is carried out before any fertiliser or organic manure is applied to ensure the results reflect the true baseline nitrogen status of the soil.
Early nitrogen is critical for crop development
For spring cereals, early nitrogen availability is critical for supporting tiller survival, canopy development, and timely progression through key growth stages. Maize is generally oversupplied with SMN, making an accurate SMN measurement essential for determining an appropriate fertiliser rate to avoid applying more nitrogen than the crop can realistically use.
By basing decisions on measured SMN values, nitrogen rate can be fine-tuned, improving nitrogen use efficiency and reducing the risk of unnecessary applications and environmental losses.
Accounting for nitrogen from organic inputs applied to spring-sown cereals and maize
Organic manures and other organic materials can provide a substantial proportion of the nitrogen and other nutrients needed by spring crops, but their content is highly variable. Factors such as type, dry matter, storage conditions, and application method all influence how much nitrogen becomes plant‑available.
Our N-Check analysis packages provide advisors with the essential baseline to integrate these inputs effectively. By testing soils and analysing organic manures before they are applied, the plant‑available nitrogen contribution can be accurately accounted for within the overall nutrient management plan. This ensures fertiliser rates are adjusted appropriately, improves nitrogen use efficiency, avoids unnecessary applications, and supports a more sustainable and compliant nutrient management strategy.
Building confidence in nutrient management
Growing crops where weather patterns remain unpredictable and input costs continue to challenge margins means that evidence-based nutrient planning is more important than ever.
Analysing SMN levels with N-Check gives advisors and farmers the confidence to make more informed decisions, ensuring nitrogen applications are aligned with crop demand and environmental best practice. By starting with an accurate understanding of soil nitrogen supply, spring-sown cereals and maize can be managed more effectively, improving establishment, increasing resilience, and enhancing nutrient use efficiency (NUE). All of this results in better production and environmental outcomes.
How NRM can help
N-Check and N-Check Plus will help you understand the nitrogen levels across your farm for the upcoming growing season. Early planning is key to maximising crop productivity and minimising input costs.
Contact NRM for more information or discuss how to go about soil nitrogen sampling with your agronomist.
Click here to order kits and learn more about our N-Check services.
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