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Nutrient balance

How much fertilizer you waste, and in which part of the field

The lab tells you what is in your soil. We tell you what your crop will be able to take up.

The first diagnosis is free.

One field emerging unevenly: denser in one zone and paler in another
What looks worst is not always what needs the most. Digitally generated image.
Two heaps of fertiliser on the ground: one big and one small
What the lab
says
What the crop
takes up
Digitally generated image.

The problem

The lab says what is there. Not what your crop can take up.

They are two different numbers, and the second is the one that matters.

A very common case is phosphorus. With a high pH and free lime in the soil, phosphorus shows up in the soil test and the root cannot reach it. If nobody corrects that figure, the recommendation comes out too high. Or too low, which costs just as much.

And it works the other way round: some fields have been getting phosphorus for years on a soil that already has plenty.

Where the money usually is

Three places where there is almost always too much fertiliser

You do not need to change how you work. Almost all of it sits in three things you can see as soon as someone puts the numbers on the table.

A store with more fertiliser bags than needed
Digitally generated image.
01

You fertilise for the good year

Almost everyone fertilises for what the field gives when the season goes well. In the other years you pay for fertiliser the crop never removes. Fertilising for what that field removes on average is the decision that moves the most money.

02

You spread manure or slurry and you pay for the phosphorus a second time

Manure and slurry carry phosphorus. If you then apply mineral fertiliser as if you had put nothing on, you pay twice for the same thing. How much of that phosphorus your crop can take up, and for how long, depends on your soil: with a lot of lime it gets locked up sooner. That is why a general table is not enough: you need to know what yours contained and what your soil does with it.

03

Your soil is already rich in potassium and nobody told you

Many soils are well supplied with potassium, and yet it is still applied every year, out of habit. A trial of more than thirty years on a rich soil showed it: with no potassium applied, the yield did not fall. Some fields can go without it this year. Stopping feels risky, and that is normal. That is why you need a number in front of you, not a hunch.

From the tractor cab, both hands on the wheel, facing a field sown in rows
Digitally generated image.

And also

A nutrient management plan is a document you have to prepare

In England, the Farming Rules for Water ask every farm to plan its fertiliser use so that it does not go beyond what the soil and the crop need, with a soil analysis at least every five years. In a nitrate vulnerable zone (NVZ) you also need a nitrogen plan for each field before you spread, and you keep your records for five years.

A plan like that starts from a nutrient balance. What we give you is meant to help you spend less, and it is the groundwork for your own plan.

Wales, Scotland and Northern Ireland have their own rules, and so does each US state. This is not an official NRCS 590 plan: if you need one for a programme, it must be signed by a certified local planner, and our analysis can be the groundwork.

A zoned soil analysis and a variable rate map are what schemes that fund variable rate application ask for. Schemes open and close: check the current one.

The rules, explained ·How to read your soil test

Not sure how to read your soil test? Send it to us, the diagnosis is free.

The method

Twelve factors before we work out a single kilo

Some of them are already in your soil test. What the lab does not calculate is how each one changes what the plant will be able to take up. And that decides how much fertiliser you need. They come in three groups.

What the soil is like

Texture, temperature, redox potential and irrigation water. They govern what the soil holds, aerates and moves.

What locks up the nutrient

pH, free lime, cation exchange capacity, electrical conductivity and two matrices of nutrient antagonisms. They decide what stays stuck to the soil and what reaches the root.

What is alive

Organic matter and the microbiome (what lives in your soil). It unlocks the rest: it goes into the calculation, it is not an appendix to the report.

The twelve factors that correct the soil test: from the lab figure to what the plant can take up

Click to enlarge.

What you receive

Four things, by email, with a link

  • How much fertiliser you waste

    In kilograms (pounds) and in euros, field by field.

  • The nutrient plan

    A fertiliser plan for each field, the groundwork for your own nutrient management plan and your records.

  • The zone map

    For a tractor that changes the rate by itself (variable rate). If you do not have one, most of the saving is still there with a single rate for the whole field.

  • The report

    A practical one, with what to do. With Premium, also a full one, with the why.

Nothing to install. Nothing to learn. And no subscription: you pay for each analysis, that is all.

We work remotely. You send us your soil test, and we send back the interpretation, the balance, the plan and the variable rate map for your tractor. Tell us which method your lab uses: we work with Mehlich-3, Olsen and Bray-1 results; if your lab uses another, we tell you before you pay. Results in ppm or lb/acre are fine (lb/acre is about ppm × 2 for the top 15 cm / 6 in). In the UK, we work from the mg/l your lab reports and give you the index (0 to 6).

The sample report

Look at it before ordering yours

A complete report, from start to finish, with its maps. Yours will look like this.

The analysis comes from a real farm. The farm and the client are not identified.

First page of the sample report, with the farm details blurredSee the full report

Two levels

Depending on what you need to know

The difference is not the amount of paper. It is the question each one answers.

When the field is even

Essential

How much fertiliser you are putting on that you do not need, and in which zones.

Sampling
One composite sample per 25 ha (62 acres), taken by you or your adviser and sent to your lab.
Where the zones come from
The soil test says how much fertiliser the field needs. Satellite images of the last five seasons say which parts always yield more and which less. Putting the two together, the rate is adjusted in each zone.
Report
Practical Report, nutrient plan and a map for the tractor.

When the field is uneven

Premium

Why one part of your field yields less than another, and what to do in each zone.

Sampling
One sample per 5 ha (12 acres), on our zone map: taken by you or your adviser and sent to your lab.
Where the zones come from
From your own samples. The map is drawn from the real soil, not from what you see from above.
Report
Practical Report and Full Report, with the why behind each recommendation, and a map with the zones of your soil.

Not sure whether your field is even? Start with Essential: the satellite will show you.

Two add-ons

What sharpens the calculation

They can be added to either level. They go into the calculation, they are not an appendix.

Your soil microbiome

It is what lives in the soil. Part of your fertiliser is not something you apply: the microbiome releases it. If it is switched off, you pay for all of it.

Irrigation water quality

If you irrigate, the water brings things in and also takes them away. Hard water changes the fertiliser plan; saline water changes it completely.

A handful of dark soil in two hands, with fine roots and an earthworm
Digitally generated image.
Map of one nutrient by zones on a farm

How often

The soil does not change from one year to the next

  1. Every three seasons

    The soil test. There is no need to repeat it every year: the soil moves slowly.

  2. Every year

    The fertiliser plan. The target yield and the price of fertiliser do change every season.

That is why in the first year we analyse, and in the following years we only recalculate.

Start without paying

Got a soil test in a drawer?

Send it to us. We tell you what you have too much of and what is missing, with numbers and without charging you anything. Then you decide.

  • One per client, for 25 ha (62 acres) or more.
  • Send us photos or a PDF of your complete soil test, no more than three years old, and a questionnaire about the field's history.
  • If you already have it, three working days. If it needs sampling, three weeks.
  • Clear terms, in writing, and nobody calls you every week.

Prefer to ask for a quote straight away? Write to us or see the prices.

An old soil test kept in a kitchen table drawer, next to the phone
Digitally generated image.