If you read my recent blog, you'll be fully informed of how to check the nutrition status of your crop. Attention now turns to final nitrogen applications which will need to be as efficient as possible to make up for this seasons low levels of soil nitrogen.

Your crop requires as much support as possible right now and in this blog I'll be guiding you through the techniques you could implement to ensure this.

Following on from a previous blog about early nutrition strategies, unfortunately due to continued wet weather there has been limited opportunity to complete many field applications. For some, this has been very 'stop/start'. For others, it's been absolutely impossible to get out in the field.

Many of you will be looking for guidance on how to manage the impacts this is having on farm. Let's look at some pointers on how to keep an eye on crop nutrient health as we enter into a period of peak applications and big biomass growth.

Many of you will be aware of the urea stewardship scheme due to come into force in England from 1^st April 2024, however, for some there are still questions as to what the new regulations include.

Back in May 2023 when an early announcement was released about the rules, I outlined everything you needed to know. In this blog, I think some of that information is worthy of a recap, particularly why Defra is focused on the stewardship of urea fertilisers, as well as a reminder of what you need to do in certain scenarios to stay compliant with the regulations. 

'Versatility' has become 'the norm' for many people across the globe following the many and varied extreme events of the past four years. More specifically within UK agriculture, there have been the challenging unseasonable weather patterns during autumn and spring. These have affected growers' annual cropping plans, key agronomic timings and fertiliser applications.

DEFRA's consultation on reducing ammonia emissions from urea fertilisers closed in January 2021, but it wasn't until April of this year that the outcomes were clarified. 

Now that we can consider all the details, I've outlined some Q&As to offer more context to the new regulation and what it aims to cover.

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Last year, I wrote a blog on how to increase nitrogen use efficiency (NUE) to improve your farm efficiency rating and part of this looked at the impact of nitrogen losses.Following on from this DEFRA recently announced a non-regulatory approach which outlines how to reduce ammonia emissions from any urea-based fertilisers.

​The low levels of sulphur we see today are not a new problem. Rather, it is something we've been aware of for over 30 years; ever since the first sulphur-deficient oilseed rape crops were seen on very light soils. Over time, this deficiency has progressed and now impacts virtually all crops and soil types. By looking at the factors that influence sulphur availability, you can make informed decisions and opt for products that match your crops' sulphur demand. 

If a production system experiences losses, its efficiency is going to be reduced. Often this can lead to a reduction in output too and, if losses are severe enough, even an increase to overall running costs.

If we look at this in relation to our fertiliser programmes the risks are similar, so preventing any losses can lead to some real gains. For example, by reducing the CO₂e/t of production you could improve your margins and simultaneously benefit the environment.

Potatoes are not unique in this respect, but virtually all of their macro-nutrients applications are made before the crop is planted and well before the peak uptake of nutrients that happens 60-75 days after emergence. This, coupled with the plant's naturally poor inherent ability for rooting, means that efficient uptake of nutrients is always challenging.

Well, it won't be surprising to learn that many soils will have lost nitrogen via leaching.

To demonstrate the impact, AHDB has produced a map to show the winter rainfall classification. This forms part of the RB209 book method for producing a Soil Nitrogen Supply (SNS) index and is a good starting point as you begin to look at your nitrogen programme for this spring. 

However, rather than rely solely on this information, our team at Frontier decided to carry out the measurement of Soil Mineral Nitrogen (kg N/ha) at a number of nationwide trial sites. The findings are outlined in the below table.