Since the rain has started to fall across the UK, I've had several people asking about the final nitrogen applications on a number of crops. Unsurprisingly, there's quite a lot to consider so we've put together a two-part blog series to help you address all of the key information.

In this first blog I've compiled some advice on final nitrogen decisions for the main arable crops, taking into account overall conditions we've seen this season and what they mean for final doses on oilseed rape, winter wheat and spring cereal crops.

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.

With April quite literally around the corner and early nitrogen doses now applied, it's an opportune time to reflect on what's happened so far this season and factor in decisions for future applications. I believe it's always sensible to constantly question the fertiliser plans and programmes made earlier in the season and it's not to say they are wrong, it's to check they are still right!

We are seeing an increased interest from growers when it comes to the use of advance micro-nutrition and biostimulants as part of their integrated approach to pushing crop performance. Given where we are in the season, we thought it would be useful to give an overview of biostimulants and their role in crop production – specifically how and when to use them. We'll also explain our BioPlan service and how taking a sequenced approach to applications can support overall performance and sustainability.

​At this stage of the season, there is a lot to think about and plan on farm.

At SOYL, we have been running an extensive precision farming research and development programme for nearly 30 years. The work is central to the value of our technology and services, and today we now possess one of the largest trial databases in the world. A significant part of this work involves trials to compare our variable rate application approach against flat rate applications.

It's one of the first questions we face from growers when discussing variable rate nitrogen (VRN) and it's understandable given sulphur is one of the major nutrients required by plants. If optimum amounts aren't available, it will have a direct impact on end yield.

As it happens, in nearly all of these conversations our recommendation to growers is to apply sulphur variably alongside their nitrogen in order to achieve optimum yields and quality. Of course, as with all nutritional decisions, some forward planning is required.

With this in mind, we're going to address some common questions to help you plan for the spring and ensure you get the maximum benefits from variably applying sulphur.

I'll admit that at first sight filling your tractor with oil and planning your nitrogen applications don't appear to have much in common but in one simple way they are very similar. Before you do both, you need to know how much you've already got in the tank or in the soil, so you know exactly how much more you need to put in.

When it comes to nitrogen applications, rates should only be decided once you have fully assessed the requirements of your crops. As well as thinking about inputs, this also means making an informed judgement on how much nitrogen will be supplied by your soils.

This week we were delighted to hear that one of our customers, Tim Lamyman, has scooped both a silver and gold medal in this year's Yield Enhancement Network (YEN) competition. Congratulations, Tim!

The 2019/20 cropping season was one that none of us will forget in a hurry, with one of the wettest autumns and winters in recent history. This was followed in quick succession by a drought and low levels of incoming solar radiation during the key grain filling period. 

The nitrogen inputs to your crops can be one of the most important factors that influence crop output and, ultimately, the profitability of your business. There is a wealth of tools and information to help guide you when it comes to applying the optimum rate of nitrogen, but how do you know if you are actually getting it right and making the best use of these applications to maximise your financial return?

The stark variation across the country has continued into harvest this year, with some areas completed a couple of weeks ago while others are struggling to make real headway as a result of the wet weather. Where completed, the SOYL applications team has been busy processing fertiliser recommendations ready for post-harvest P and K applications - allowing new season orders to be booked. 

For many growers though, doing this raises the question: What considerations should be made when planning P and K management?

We've certainly seen Mother Nature go from one extreme to the next in recent months. Given the incredibly dry April and May experienced this spring, it is difficult to comprehend that February was actually the wettest on record. Let us not forget that this also followed the consistently above-average rainfall throughout autumn and winter too.

However, a generally kind March and early April allowed for some substantial spring cropping. While somewhat of a forced change for many, this - coupled with the extremes in weather - has significantly impacted the nutrition requirements for this and potentially next year's crops.

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.

Phosphorus and potassium are vital for photosynthesis and water regulation – but how much of them do you need to guarantee healthy plants?

Precision technology can play an important role when it comes to successful nutrient management. With P and K in particular, there is a considerable benefit to carrying out nutrient mapping and variable rate applications of fertiliser in that you are able to individually deal with field areas that are both below, at and above the critical level. 

Carbon farming is a 21^st-century buzzword and the pressure is on for modern farmers to take account of their carbon footprint. However, this drive to 'go green' can seem at odds with the commercial objectives of a profitable farm.

Yet, none of us can escape the inevitable changes ahead. The government has committed to the goal of a carbon-neutral UK by 2050. This is an increase from the 80% reduction in greenhouse gases that was agreed to in the Climate Change Act of 2008.

​The recent dry weather has been incredibly welcome and has finally allowed drills, sprayers and fertiliser spreaders to roll across the country. But, dare I ask, how long will it be before we're looking for some fresh rain?!

There is clearly a massive variation in growth stage and condition of the autumn crops across the country, but the more forward crops have started to get hold of applied nitrogen and actually look quite good .At the other extreme, some of the most backward crops are not that far ahead of the spring cereals that are now going in the ground. As long as reasonable seedbeds can be achieved and drilling doesn't get delayed, the potential for these spring crops should be good. 

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.

The relentless wet weather is likely to mean that more growers will be growing maize this season; either for the first time, or for the first time in a long time. Maize is a crop that needs careful management and seed treatments are an important part of that management that have seen some significant changes.

Most maize growers will be aware of the challenges we now face with the loss of the active ingredient methiocarb; best known as the seed treatment Mesurol. This seed treatment has for years provided class leading bird repellence, particularly against rook damage and other corvids, to the extent that some will have forgotten quite how damaging these pests can be. 

Sulphur is a key component of successful crop production; as important as nitrogen when it comes to planning nutrient applications. A multi-nutrient sulphate fertiliser range from ICL called Polysulphate is one that we've recently introduced to our range and is something I am talking about to many of the growers I advise.

Two new Polysulphate products, PKpluS and PotashpluS are especially of topical interest to the increasing number of farmers considering spring pulses on the back of dismal autumn weather.