UK Soil Health 2026: A Working Farmer’s Guide

Last updated: May 2026. This guide pulls together where UK soil health 2026 sits across policy, science and on-farm practice: organic matter targets, the SFI soil actions and rates, the Defra Soil Health Strategy and indicators release, RB209 nutrient management, the peat question, and the testing decisions a working horticultural and arable holding actually has to make. It is general information, not bespoke agronomy. See the planning checklist at the end for what to do this season.

The soil pit was about three feet deep, in the corner of an arable field we’d brought back into rotation two seasons ago after fifteen years of continuous salad and veg. The agronomist had stuck a spade in, said nothing for a minute, then asked me to come and look. The compaction was a polished band at six to eight inches, running across the corner where the pickers’ tractor had turned a thousand times, and below it the soil was the same struck-grey colour you see in a bagged-salad bed that’s never had a winter to recover. Above the band, the wheat roots stopped. Below, they went on for another foot.

Twenty-one summers in salad and veg in Suffolk, the last two with arable folded back into the rotation, and I’d have told you I knew what compaction looked like before that hour. I didn’t, not really. The veg side teaches you to read the surface and the top six inches because that’s where the crop lives. The arable side has been a course in everything below that, and the bones of UK soil health 2026 turn out to be more honest, more measurable and more political than I’d realised. This guide is the conversation I’ve been having with our agronomist, our laboratory and the SFI paperwork ever since.

Where UK soil sits in 2026 — UK Soil Health 2026

The bones of UK soil policy in 2026 look like this. Defra published the Indicators of Soil Health for England, 2026 release on 25 March 2026, the second annual snapshot of the national picture and the working baseline for the rest of the decade.[1] Drained lowland peat under arable and horticulture remains the single largest land-use source of agricultural emissions in England.[2] The Land Use Framework published earlier in 2026 commits to a national soil health baseline by 2028, with the next phase of NCEA capital investment programmed for 2028/29.[1] And on 13 April 2026 Defra and Cranfield University opened the LandIS national soil database to the public, removing the licence and paywall that had limited access for over twenty years.[3]

That last one matters more than the press release made out. LandIS sits behind every soil map most working farmers have seen, and it is now free. Every block on this farm has a soil-series description in there, and the agronomy conversation is meaningfully better when the soil-series description is on the table.

The Defra indicators put the median soil organic carbon stock in rural England at 71 t C/ha across the 2023-24 sample, with mineral soils at 68 t C/ha and peat soils at 135 t C/ha.[1] That 71 figure is the working baseline. Carbon storage scored 59.6%, arable provision scored 61.9%, and the official wording is “official statistics in development”. Treat them as a direction of travel.

The policy infrastructure has improved fast in two years and the sector hasn’t caught up. The map is open, the indicators are running, the SFI offer is on the table, and the working farm is sometimes still on a soil test from 2018.

Organic matter, carbon and the measurement question

The most important number on a working soil report is the organic matter percentage, and the most common way it gets measured here is loss-on-ignition (LOI). The standard procedure is a one-gram sample, dried, weighed, baked at 450°C for four hours, weighed again. The weight loss is the LOI percentage.[4] It is cheap and quick, and the flaws are the ones every farmer has been told about: results vary lab to lab, sample mass and clay content shift the numbers, and a year-on-year comparison only works if you stick with the same lab and method.

The AHDB Soil Health Scorecard is the working framework for what to do with the result. The scorecard pulls organic matter, pH, extractable P, K and Mg, soil texture, visual structure (VESS) and an earthworm count into one traffic-light view, with ranges typical for the soil type and climate.[5] The flat number isn’t the point; the trend is. A loamy sand at 3% organic matter holding steady on five-yearly samples is a healthier picture than the same field at 4% on a downward run.

What the scorecard doesn’t say, and what every veg grower learns, is that the organic-matter target is land-use specific. AHDB benchmarks apply to mineral topsoils under crops and lowland grassland; they do not apply to peat or peaty soils with more than 20% organic matter to 40cm depth.[5] A salad block on sandy loam is in different territory from a lowland peat carrot field.

Soil organic matter is also soil carbon, in shorthand. Roughly, organic matter divided by 1.72 gives soil organic carbon. The Rothamsted long-term experiments at Broadbalk, running on the same field since 1843, show that soil organic carbon doesn’t rise or fall indefinitely; it shifts toward a new equilibrium depending on inputs, manure and nitrogen, and the equilibrium under continuous arable inputs is lower than under farmyard manure or grass.[6] The “4 per 1000” sequestration story has run aground on that maths in temperate UK conditions. Soil carbon does build, but slowly, and not without sustained organic inputs.

What I’d actually do with the organic-matter number: sample every five years from the same lab on the same fields, stop chasing percentage targets, watch the trend, and connect the trend to what you’ve been putting on the land.

pH, lime and the RB209 chemistry

The 2026 edition of RB209, the AHDB Nutrient Management Guide, was published this spring and is the working document on most UK arable and horticultural holdings.[7] It’s the first revision since the 2023 golden-anniversary edition and the 2024 strategic review, with new tables on nitrogen availability after anaerobic digestate applications, more grass-and-forage examples, and a tightened arable section.[7]

On pH, the standard targets are the simple ones. For mineral soils, RB209 sets a target pH of 6.5 to 6.7 for continuous arable, 6.0 to 6.2 for grass, and 6.0 for peaty arable.[8] Vegetables push higher, typically to 6.5 to 7.0 depending on crop, because brassicas suffer clubroot pressure below 6.8 and alliums prefer the upper end. Lime decisions are made on neutralising value (NV), with most ground limestone or chalk at NV 50 to 55%.[8]

The phosphorus story is where horticulture and cereals diverge. Olsen P, sodium-bicarbonate extractable phosphorus, is the canonical UK test for available P, and the working RB209 target across most arable and grass is Index 2 (16 to 25 mg/litre).[9] Above Index 3, no fertiliser or manure P should be applied. Recent RB209 updates allow arable holdings under autumn-sown combinable cropping with reliable establishment to run at Index 1 in some situations, which is a meaningful shift if you’ve been sitting at Index 3 from a generation of muck applications.[9] Vegetable rotations don’t get that flexibility. Salad and brassica crops respond up the index more strongly, and the contracts assume an upper-Index-2 working target.

The trap that catches a horticultural holding moving into arable is the P legacy. Fifteen years of muck under salad and veg leave a phosphate index that an arable agronomist looks at twice. The maths says you can drop fertiliser P for years, and you should, but the runoff risk to watercourses is real and the catchment-sensitive farming officer will know your numbers before you do. Plan the wind-down; don’t apply blind.

Structure, bulk density and the harvest-bed reality

Soil structure is the bit you can’t fix with a fertiliser. Bulk density is the working number for it. A rootable mineral profile sits at less than 1.5 g/cm³ to 50cm depth and less than 1.7 g/cm³ to a metre.[10] Most UK cropland topsoil sits around 1.24 to 1.29 g/cm³ in the top 20cm under decent management.[10] The AHDB visual evaluation of soil structure (VESS) test is the field equivalent: spade out a block, score breakage and rooting on a 1-to-5 scale, and you have a rapid structural read without sending anything to a lab.

The harvest-bed reality on a salad and veg holding is what the structural literature understates. A block of iceberg gets walked over by the gang, driven over by the trailer-rig at cut, run across by the picker tractor, and turned at the headland by every machine in the yard. Multiply that across a season and surface compaction at six to eight inches is the working condition, not the exception. The picker tractor on twin rears with reduced tyre pressures helps. A shallow subsoiler on the headland in autumn helps more. What helps most is the rotation that lets the block come out of intensive trafficking for a year or two, which is part of why the move into arable break crops mattered for us.

Compaction risk peaks in late autumn and winter when soils are wet, which is the worst possible week to cut iceberg or lift carrots in a soft year.[11] The temptation to push the kit on a wet bed is the single most expensive structural mistake in this trade. A buyer’s penalty for a missed week is real, but the structural cost across the next three years of rotation is bigger than most growers cost in. The most useful piece of kit on this farm for soil structure is the spade, and the second most useful is the agronomist who reads the spade better than I do.

Earthworms, mycorrhiza and the rest of the biology

The biology section is where soil science has got more interesting in the last decade and where the working farm has the least good data. The AHDB scorecard’s biological indicator is the earthworm count: dig a 20cm cube pit, count by hand, and a population of more than eight per pit is “active” for arable or ley-arable soils.[12] On our farm the count is variable. On the wheat block in its second year out of fifteen years of continuous salad, the count climbed meaningfully between the first and second autumn. On the salad blocks proper, the count is lower than I’d like, and the rotational answer is the only honest answer.

Arbuscular mycorrhizal fungi are the working soil-biology research area at Rothamsted. The headline UK finding is that multiple iterations of cover cropping increase mycorrhizal colonisation, but a single cover crop in a single year does not, and the link between mycorrhizal abundance and yield response in UK arable is weaker than the regenerative literature suggests.[13] Tillage disrupts the fungal network. Continuous living roots help. None of this is news to a regen-curious arable grower, and not much of it is settled science yet for a working salad bed where module transplanting and pre-bed cultivation are non-negotiable.

The broader microbiome is where most practical farm decisions can’t yet be defended on UK data. Soil-respiration tests, microbial-biomass-carbon tests and PLFA profiling are commercially available, but the action thresholds aren’t tight enough to drive a real management change. Soil biology matters; organic-matter management drives most of the biology you can influence; and paying for an expensive biological soil panel is worth less than getting the LOI sample timing right. Count the worms once a year on the same fields in the same week of October, watch the trend, and treat the fancy biological tests as research, not advice.

Cover crops, green manures and the salad/veg vs arable economics

Cover cropping is the SFI action everyone has heard of and the agronomic intervention most often oversold. The arable economics are reasonably well documented. NIAB TAG trial data shows yield responses on a following spring barley crop of 0.25 to 0.5 t/ha, with a margin improvement of around £80/ha once nitrogen and seed costs are in.[14] Seed costs of £20 to £50/ha are typical; a wrong species pick can run to £130/ha and lose money on the year.[14] CSAM2, the SFI multi-species winter cover crop, pays £129/ha in 2026, which on most working arable rotations gets you to a positive margin if the agronomy works.[15]

In salad and veg the picture is different. A cover crop on a salad block is doing structural work, not nitrogen-cycling work, because the rotation already runs on heavy organic-matter inputs. The window between harvest and the next bed is often too short for a genuine establishment, and the early lift the following spring can leave too narrow a residue to do real structural work. On polythene-covered blocks the cover-crop window is essentially closed.

Where cover crops have paid for us is on the arable break-crop fields. A multi-species winter cover (oats, vetch, phacelia, mustard, oilseed radish at NIAB-comparable seed-rate guidance) into the wheat stubble gives genuine structural and biological gains by spring drilling. CSAM2 stacks reasonably onto that. Green manures, legume mixes specifically, are a stronger story on lighter ground in a longer rotation; on our heavier blocks they have not paid back the establishment cost.

What I’d actually do: cover-crop the arable break, not the veg blocks. Read the seed catalogue twice. Match the species mix to the soil and the following crop, not to the SFI options sheet.

SFI 2026 soil actions: what’s paid in 2026

The SFI 2026 offer landed on 8 January and 24 February 2026 with 71 actions, down from 102, and a £100,000 annual cap on agreement value.[15][16] The five “assess and write a plan” actions, including the popular CSAM1 soil management plan, have been cut on Defra’s value-for-money grounds.[16] The headline soil actions that survived are these.

CSAM2, multi-species winter cover crop, pays £129/ha and requires a cover from at least two species in two or more eligible plant families, in place across December, January and February.[15] CSAM3, herbal leys, has been retained but the rate has been cut from £382 to £224/ha, a 41% reduction, and most of the herbal-ley acreage that ran in 2024 won’t renew at the new rate.[16] CNUM3, legume fallow, sits at £532/ha, down from £593, and is rotational with the year-one area as a one-way ratchet down.[16] CIPM3, companion crops, and CIPM4, no insecticide on arable and horticultural crops, are the IPM-side actions most relevant to soil biology, indirectly.

The hollowing-out of the soil-action menu is real. The species-rich grassland action GRH6 has been pushed across to Countryside Stewardship Higher Tier, the structural soil management plan is gone, and the herbal-ley rate cut is steep enough to depress uptake on the lighter Suffolk land where the action did real work.[16] For longer detail on the two-window timing and the £100,000 cap, see SFI 2026 actions, payment rates and the June window.

Looking back, I’d say SFI 2026 is a more honest scheme than its predecessor, but the soil-action menu is where the rate cuts hurt most. Paying less for the same actions is defensible on a Treasury sheet. It is not consistent with a Soil Health Strategy that claims to want measurable improvements by 2028.

Peat: the lowland horticulture territory

Lowland peat is the bit of British soil that the policy debate keeps coming back to. Drained lowland peat under arable and horticulture is the single largest emissions source from any land use in England.[2] The Environmental Improvement Plan 2025, published on 1 December 2025, commits to restoring around 280,000 hectares of peatland by 2050, with a Peatland Restoration Register due to launch in 2026.[2]

The lowland peat horticulture territory is the Fens primarily, and a chunk of Lancashire mosslands. Carrots, parsnips, celery, leeks and salad onions sit on it. The Defra-funded Lowland Peat 3 research programme started in January 2024 and is running paired studies on conventional cropping versus rewetted and high-water-table options including paludiculture, with a £7 million water-for-peat pilot package alongside.[2]

Suffolk holdings like ours are mineral-soil, and peat policy doesn’t bear on us directly. For the Fens grower the picture is harder. Restoration looks easy from a press release. On the working farm it’s a question of crop choice, capital write-down on existing pumps and ditches, and whether a holding that has been carrots-on-peat for forty years can transition without losing the business. The honest advice: read the Lowland Peat 3 outputs as they land, talk to the catchment-sensitive farming officer before the policy bites, and price the medium-term scenario where commercial cropping on deep-drained peat is no longer the default.

Irrigation, salinity and the EC question

Salinity isn’t a problem most British arable farmers think about. On an irrigated salad and veg holding it sneaks up on you. Recycled irrigation water, summer abstraction from a low-flow river, and a winter-fill reservoir topping up across five dry years all push the dissolved-salt concentration in the rooting zone upward. The working measurement is electrical conductivity (EC) in mS/cm, with most British vegetable growing comfortable in the 1.2 to 2.4 mS/cm range during the growing season.[17]

A pore-water EC reading in a salad bed creeping above 2.5 mS/cm is the early signal of nutrient deficiency, yellowing and yield loss before the visible symptoms turn up. The expensive case is when soil structure goes with it: high salinity damages aggregate stability, reduces microbial activity, and compacts the rooting zone in a way that lime won’t fix.[17] The cheap insurance is a soil-EC reading on the irrigated blocks twice a season and a working understanding of where your irrigation water sits on the salinity scale. For more on the abstraction and reservoir picture in UK salad and veg, see UK salad and vegetable production: a working grower’s guide to 2026.

Testing strategy: contractor, DIY and the open soil map

A working soil-testing programme is the most important hour of office work a holding does in a year, and most farms do it later than they should. The decisions are: what to sample, how often, and who does it.

The default for a working horticultural and arable holding is rolling pH, P, K and Mg sampling on a five-year cycle by management zone, with organic matter (LOI) on the same cycle, and a more targeted sample in any year you’ve changed cropping or had a structural problem on a particular field. Most laboratories run a basic package at £20 to £40 per sample. The AHDB Soil Health Scorecard ranges sit on top of that lab data, and the workbook is free off the AHDB site.[5]

On contractor versus DIY, the honest answer is that the sampling itself is something an average farmer can do better than a contractor with a generic procedure, because you know which corner of the field has been compacted by the trailer for a decade. The lab work is non-negotiably done at a PAAG-accredited laboratory; that’s the certification AHDB and Defra recognise.[18] Where I’d pay a contractor is for VESS and bulk-density sampling on a problem field, and for an annual deep dive by the agronomist on a field picked because it’s underperforming.

The opening of LandIS in April 2026 changes the contractor calculus a touch.[3] The soil-series and Soilscapes data an agronomist used to charge for is now free. That’s a win for the working farm, and it also means an agronomist still charging for “soil mapping” without genuine in-field interpretation is selling something the public dataset already gives you.

What I’d actually do: sample on a five-year rolling plan, do the digging yourself, send to one PAAG lab and stick with it, plot the AHDB scorecard, and pay the agronomist for in-field interpretation rather than data acquisition.

Regenerative versus conventional: an honest assessment

The regen-versus-conventional argument has become a culture war, which says more about farming Twitter than it does about soil. The honest evidence picture is messier than either side likes to admit.

The 2021 Food, Farming and Countryside Commission study put the yield potential of UK regenerative arable systems at around 27% lower than conventional on a t/ha basis. AHDB’s own analysis of higher-adoption regen farms shows the lowest cost of production per tonne (£148/t) was £7 to £10/t lower than medium and low adoption farms, but with lower headline yields.[19] A 2025 scoping review of UK regenerative practice found the empirical evidence base for impacts on yield and net greenhouse-gas balances was inadequate to inform policy or practice on most of the 90 identified practices, with usable data on only a third.[20] In short: the soil-structure and biology gains are real on farms that have done the work for a decade, the yield costs are real in the early years, the long-term yield trajectory is plausibly recoverable but isn’t yet evidenced at scale in UK conditions, and the profitability picture depends as much on cost-base reductions as on yield.

On a horticultural and recently-arable holding like ours, the practical position is somewhere in the middle. The salad blocks are too capital-intensive and too contract-driven to risk a yield drop on a regen experiment. The arable break crops are where regen practices (cover crops, reduced cultivations, organic-matter loading) sit comfortably and have paid back over two seasons. Anyone selling you regenerative agriculture as a binary either/or is selling a brand, not an agronomic system.

If I’m honest, the bigger conversation the regen movement has started is the one about treating soil as a long-term asset rather than a short-term substrate. The case for any specific package of practices is weaker than the noisier voices claim, but the underlying argument is sound. For more on the cropping side of the picture, see the UK arable farming guide and the UK crop protection 2026 guide. The wider set of long-form pieces sits in the Knowledge Hub.

A planning checklist for the 2026 season

The five-year direction of UK soil policy is reasonably clear, even if the in-year mechanics are choppy. The Defra Soil Health Strategy and the indicators release set a 2028 baseline target. The SFI offer is committed for the rest of this Parliament, with the 2026 rates fixed and the soil-action menu narrower than the original ELM ambition. The LandIS opening is a structural improvement. Lowland peat policy is going to tighten across the late 2020s.

For working farms running into the 2026 season, the housekeeping comes down to a fortnight of evenings.

Pull the most recent soil reports from the office, line them up against the AHDB scorecard ranges, and identify any field that has drifted on organic matter, pH or Olsen P. Plan a fresh sampling round on fields that haven’t been done in five years, and stick with one PAAG-accredited lab on a single method.

Walk a problem field with a spade, do a VESS score, dig three earthworm pits, and write the results into the field record. Do it once a year on the same date. Watch the trend.

Read the 2026 RB209 chemistry section that applies to your cropping. If you have a vegetable-and-arable mixed system, read both.

Map your CSAM2 cover-crop options against the arable break crops, not the veg beds. Cost the seed mix at NIAB-comparable rates.

If you are on lowland peat, pull the Lowland Peat 3 outputs and the peatland-restoration policy posts, and have an explicit conversation with your land agent about the medium-term cropping picture.

Open the LandIS portal for every field on the holding and download the soil-series and Soilscapes data into the office file. It is free, and the conversation in the field is improved by it.

If you grow salad and veg, watch the irrigation EC across the season. If you don’t, ignore that one and double up on the arable items.

The work carries on. The crop comes off, the bed gets prepared, the spray decisions get made. The soil under it all is the asset that decides whether the same conversation in 2030 is happier than the one in 2025. The 2026 policy backdrop is more useful to a working farm than it has been for a decade. The job is to use it.