Arable Farming: The Decisions That Determine Yield, Soil Health and Whether the Crop Actually Makes Money

Cereals, oilseeds, pulses, rotations and machinery timing — what every arable farmer should understand before the next drilling season, spray pass or harvest.

Arable farming can look straightforward from the roadside.

Prepare the land, drill the seed, feed the crop, control weeds and disease, then harvest it.

In reality, it is a business of thousands of decisions made months before the final grain price is known.

The farmer must decide what to grow, when to drill it, which variety to use, how much fertiliser to apply, whether a spray is justified, when machinery should travel, when to harvest and whether to sell grain immediately or store it.

Every decision interacts with the others.

A poor rotation can create weed and disease problems.
A badly timed machinery pass can damage soil structure.

An expensive crop can yield well and still lose money.

A lower-yielding crop may sometimes make more sense if it reduces input costs, spreads workload or improves the following crop.

The most important principle is therefore:

Do not judge an arable crop only by tonnes per hectare. Judge it by the margin it leaves, the condition of the soil it leaves behind and what it does to the rest of the rotation.

The discussion below is mainly written around UK arable farming.

1. The first number every arable farmer should know: Cost per tonne

Farmers often talk about yield first.

“The wheat did 9 tonnes.”

That is useful information.

It is not enough.

Suppose two farms both harvest 9 tonnes per hectare.

Farm A

Production cost: £1,350/ha
Yield: 9 t/ha

Cost of production:
£150/t
Farm B

Production cost: £1,800/ha
Yield: 9 t/ha

Cost of production:
£200/t

Same crop.

Same yield.

Completely different business result.

A proper cost calculation should include:

- Seed.
- Fertiliser.
- Lime.
- Herbicides.
- Fungicides.
- Insecticides where legally and agronomically justified.
- Plant growth regulators where used.
- Machinery.
- Fuel.
- Repairs.
- Labour.
- Drying.
- Storage.
- Haulage.
- Rent.
- Finance.
- Contractor charges.
- Depreciation.
- Insurance.
- The farmer's own labour.

A record-breaking crop can still be financially poor if achieving that yield required excessive expenditure.
Yield is production. Margin is business performance.

2. Gross margin is useful — but do not stop there

Gross margin normally compares crop output with variable costs.

For example:

Illustrative wheat crop

These figures are illustrative only.

That £1,050 is not £1,050 profit.

The farm still has to pay for machinery, labour, rent, buildings, finance, administration and overheads.

This is why farmers should ideally understand three different figures:

1. Gross margin per hectare
2. Net margin per hectare
3. Cost per tonne produced

Together they provide a much better picture than yield alone.

3. Rotation may be the most important decision made before drilling

A crop should rarely be viewed in isolation.

Its real value includes what happens before and after it.

A good rotation can help:

- Break pest cycles.
- Reduce disease pressure.
- Diversify weed-control options.
- Improve soil structure.
- Introduce nitrogen-fixing crops.
- Spread drilling and harvesting workload.
- Reduce machinery pressure.
- Improve following-crop performance.

A poor rotation may do the opposite.

Continuous production of the same or similar crops can increase the selection pressure for certain weeds, pests and diseases.

That can make crop protection more difficult and expensive.

4. A rotation should make agronomic and financial sense

A simple rotation might include:

Winter wheat → oilseed rape → winter wheat → beans

Another farm might use:

Winter wheat → spring barley → beans → winter wheat

Another could include:

- Oats.
- Linseed.
- Peas.
- Temporary grass.
- Cover crops.

There is no universally correct rotation.

The right choice depends on:

- Soil.
- Rainfall.
- Local markets.
- Storage.
- Machinery.
- Weed burden.
- Disease history.
- Labour.
- Contract availability.
- Environmental agreements.
- Gross margins.

The important question is not simply:

“Which crop pays the most this year?”

It is:

“What does this crop contribute to the profitability and resilience of the whole rotation?”

5. Cereals: Wheat, barley and oats are not interchangeable

Cereals form the backbone of many UK arable rotations.

But each crop has different markets and agronomic requirements.

Wheat

Potential markets include:

- Milling.
- Feed.
- Distilling.
- Export.

A milling wheat contract may offer a premium.

But that premium usually depends on achieving specifications such as:

- Protein.
- Hagberg Falling Number.
- Specific weight.
- Moisture.
- Other contractual quality requirements.

Growing milling wheat without a realistic chance of achieving milling quality can mean paying for additional inputs and receiving feed-wheat value anyway.

Barley

Barley may be grown for:

- Feed.
- Malting.
- Brewing.
- Distilling.

Again, premium markets normally require specifications.

A malting contract can be attractive, but the crop has to meet the buyer's requirements.

Oats

Oats may offer a useful rotational alternative but marketing needs to be understood before drilling.

Food-grade and milling markets can have specific quality expectations.

Never assume that simply growing the crop means the premium market will accept it.

6. Variety selection is a business decision

A variety should not be chosen simply because it has the highest headline yield.

Farmers should consider:

- Disease resistance.
- Standing ability.
- Maturity.
- Soil suitability.
- Drilling date.
- Market acceptance.
- Grain quality.
- Regional performance.
- Lodging risk.
- Input requirements.

AHDB's Recommended Lists programme has historically assessed cereal and oilseed varieties for characteristics including yield, quality, disease resistance and agronomic
performance. AHDB

The important lesson is that yield potential is only one characteristic.

A slightly lower-yielding variety with better disease resistance may sometimes produce a better margin because it carries less risk or requires fewer inputs.

7. Drilling date changes almost everything

Drilling is not simply about getting seed into the ground.

Timing can influence:

- Establishment.
- Weed competition.
- Disease.
- Pest risk.
- Crop development.
- Soil damage.
- Harvest timing.

The temptation during a difficult autumn is often:

“Just get it drilled.”

Sometimes that works.
Sometimes it creates an expensive crop planted into soil that was not ready.
Wet cultivation can smear soil.
Heavy machinery can compact it.
Seedbeds can become poor.
The crop may then struggle for the rest of the season.

A late crop planted well may sometimes outperform an early crop established badly.

8. Blackgrass and resistant weeds can change the entire rotation

Weed management should not rely on one herbicide programme.

Some arable weeds have developed serious resistance problems.

Blackgrass is perhaps the best-known example in UK wheat production.

Successful management may require combining:

- Crop rotation.
- Delayed drilling.
- Spring crops.
- Competitive varieties.
- Seed rates.
- Stale seedbeds.
- Mechanical control.
- Effective chemistry where appropriate.
- Preventing seed return.

That is integrated weed management.

The central lesson is important:

The strongest weed-control programme is often built across several years, not from one spray tank.

9. Herbicide resistance should change how farmers think

If one herbicide kills 99% of susceptible weeds but the resistant 1% survive and reproduce, repeated use selects increasingly resistant populations.

Eventually the chemistry may become far less useful.

That means every treatment should be considered strategically.

Ask:

- Does this treatment genuinely need applying?
- Is the weed correctly identified?
- Is the timing appropriate?
- Are cultural controls being used?
- Are repeated modes of action increasing resistance pressure?

Chemical crop protection remains an important agricultural tool.

But preserving its effectiveness requires responsible use.

10. Integrated Pest Management matters more than simply reducing sprays

Integrated Pest Management, or IPM, means combining different methods of preventing and controlling pests, diseases and weeds.

It can include:

- Rotation.
- Resistant varieties.
- Monitoring.
- Forecasting.
- Biological controls.
- Habitat for beneficial insects.
- Cultural controls.
- Threshold-based decisions.
- Chemical treatment when justified.

England's SFI26 included actions specifically connected to integrated pest management and other arable environmental practices, although the 2026 application window is now closed after its allocated budget was reached. GOV.UK

That illustrates how closely crop protection, environmental management and farm policy are increasingly connected.

11. Fungicides: Treat risk, not habit

Disease management in cereals can involve:

- Septoria.
- Rusts.
- Mildew.
- Eyespot.
- Fusarium.
- Other crop-specific diseases.

The appropriate programme depends on:

- Variety.
- Weather.
- Drilling date.
- Previous crop.
- Disease pressure.
- Yield potential.

A routine spray applied simply because:

“We always spray this field at this stage”

is not necessarily good management.

Equally, refusing to treat a genuine disease threat simply to save money can be false economy.

The decision should be based on crop risk and likely return.

12. Timing can matter as much as product choice
Crop-protection products generally perform best within specific growth stages and conditions.
The wrong application timing can reduce performance even when the correct product is used.

This is why crop walking matters.

A farmer or agronomist needs to know:

- Crop growth stage.
- Disease present.
- Weed stage.
- Pest population.
- Weather forecast.

A £20/ha treatment applied at the correct time may produce more benefit than a £40/ha treatment applied too late.

13. Oilseed rape: Valuable break crop, but establishment is everything

Oilseed rape can provide an important break crop in cereal rotations.

Potential benefits can include:

- Different herbicide opportunities.
- Rotation diversification.
- Earlier harvest.
- Useful following-crop opportunities.

But UK growers have faced significant establishment challenges, including cabbage stem flea beetle pressure in some areas.

That has led many growers to reassess where oilseed rape fits in their rotation.

A crop that never establishes properly can consume seed, cultivation, fertiliser and spray costs without ever having realistic yield potential.

This makes early assessment important.

Ask:

Does this crop still have enough plant population and potential to justify further investment?

Sometimes continuing to spend money on a failed crop simply increases the loss.

14. Pulses: More than simply another crop

Pulses include crops such as:

- Field beans.
- Peas.

They are particularly interesting because legumes can fix atmospheric nitrogen through their association with root bacteria.

That can reduce their requirement for applied nitrogen fertiliser and provide rotational benefits.

However, pulse crops still require proper agronomy.

Important issues can include:

- Soil structure.
- Drainage.
- Establishment.
- Weed control.
- Disease.
- Harvest losses.
- Market specification.

Do not plant beans simply because they are a break crop.

Know who will buy them.