Weed Management & Blackgrass
Weed Management: Calculators & Tools
The calculators and planners inside Weed Management, and what each is for.
These tools use your own holding data rather than illustrative figures, and each one shows its method so you can check the working rather than trust the output.
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Cost of Herbicide Resistance Calculator
Apply the published margin penalty from resistant blackgrass to your own area and pressure, and see what a cultural programme is worth.
How this is calculated
The published mean cost of resistance is scaled by your stated pressure level and applied to the affected area and margin. Recovery assumes a multi-year cultural programme reducing the population progressively rather than a single-season fix.
Cultural control works over several seasons and fails if abandoned after one difficult autumn. The model shows the trajectory, not a one-year saving.
Calculators and tools
Answers you can check, using your own numbers
Every calculator shows its method. If you disagree with an assumption you can see it, change it, and see what it does to the answer.
Four-Nation Scheme Eligibility Check
Answer six questions and see every UK support scheme your business is likely to be eligible for, ranked by indicative value.
Open the calculatorCrop Gross Margin Calculator
Work out gross margin per hectare for a crop, with the variable costs itemised so you can see where the margin actually goes.
Open the calculatorNutrient Requirement Calculator
Calculate a field nitrogen requirement from target yield, soil supply, manure credits and previous cropping.
Open the calculatorWoodland Income Stacking Calculator
See creation grant, maintenance payment, carbon units and biodiversity units modelled together over the project life, against the agricultural margin you give up.
Open the calculatorBiodiversity Unit Calculator
Estimate the biodiversity units a habitat creation or enhancement scheme would generate, and compare thirty years of income against the farming margin it replaces.
Open the calculatorFarm Carbon Footprint Estimator
A first-pass emissions estimate from the activity data most farms already have, showing where the emissions actually sit.
Open the calculatorInheritance Relief Exposure Model
Model qualifying property against the relief cap for an individual and for a couple, including the instalment option.
Open the calculatorRainwater Harvesting Calculator
Size the harvest available from your roofs, the storage needed to make it reliable, and the payback against what you currently pay for water.
Open the calculatorTrue Machinery Cost Calculator
Work out what a machine actually costs per hour and per hectare, including the depreciation nobody sees in the cashbook.
Open the calculatorCost of Herbicide Resistance Calculator
Apply the published margin penalty from resistant blackgrass to your own area and pressure, and see what a cultural programme is worth.
Open the calculatorMargin Over Purchased Feed
The weekly number that tells a dairy business whether it is making money, calculated from your own milk price and feed cost.
Open the calculatorCost of Liveweight Gain
What a kilogram of gain actually costs, so a store purchase decision is made on the number rather than on the day.
Open the calculatorHedgerow Income Calculator
Every metre of boundary, mapped to every scheme action that could pay for it, in your nation.
Open the calculatorSolar Self-Consumption and Payback
The return on farm solar is driven by self-consumption, not by generation. This works out both.
Open the calculatorAnnual Forage Budget
Balance what the grassland will grow against what the stock will eat, and find the deficit before it becomes a feed bill.
Open the calculatorGrain Drying Cost Calculator
The cost of taking each percentage point of moisture out of a tonne of grain, and whether it beats the drying deduction.
Open the calculatorSpray Buffer Zone Checker
Work out the no-spray distance required for a product next to a watercourse, and whether a reduction applies.
Open the calculatorSeasonal Cashflow and Peak Borrowing
Find the point in the year when the business needs the most money, which is the number the facility has to cover.
Open the calculatorAssurance Audit Readiness Score
Ten questions that predict most audit non-conformances, scored with a prioritised list of what to fix first.
Open the calculatorBreak-Even Selling Price
The price below which selling loses money, calculated from your own cost of production.
Open the calculatorAbstraction Licence Position
Where you are against your authorised volume, and how many days of headroom remain at current use.
Open the calculatorCost Per Kilogram of Nutrient
Compare fertiliser products on what actually matters — the cost of the nutrient, not the price of the bag.
Open the calculatorGlamping Unit Appraisal
Break-even occupancy for a proposed unit, including the utility and access costs that are usually forgotten.
Open the calculatorInteractive
Tools you actually use, not screens you read
These are working interfaces inside the module — maps, calculators, planners and dashboards that respond to your own holding data.
Blackgrass population map with year-on-year change visualisation
Blackgrass population map with year-on-year change visualisation
MapCultural programme builder scoring each lever against expected population reduction
Cultural programme builder scoring each lever against expected population reduction
BuilderDrilling date versus population model with margin trade-off shown
Drilling date versus population model with margin trade-off shown
ToolResistance status dashboard by field and mode of action
Resistance status dashboard by field and mode of action
DashboardCost of resistance calculator applying the measured margin penalty to your area
Cost of resistance calculator applying the measured margin penalty to your area
CalculatorFind
Find suppliers and laboratories
Filter by type, nation, distance and accreditation. Results are ranked by relevance to your holding once your holding record exists, and alphabetically before that.
6 records shown from the platform’s own register
- Module Nutrient Management Planning Flagship
- Module Fertilisers & Plant Nutrition Core
- Module Crop Protection, Pesticides & IPM Flagship
- Module Biologicals & Biostimulants Core
- Module Weed Management & Blackgrass Core
- Module Crop Disease & Pest Diagnostics Core
Obligation calendar
What weed management asks of you, and when
Windows, deadlines and recurring obligations for England. Set a different nation and the calendar reconfigures; farm across a border and it shows both, reconciled.
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March 1 entry
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6 March: Map and count the population
A recurring step in weed management.
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April 1 entry
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20 April: Adding Value Grant
Round-based.
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May 1 entry
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4 May: Design the cultural programme
A recurring step in weed management.
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June 2 entries
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5 June: Farming Transformation Fund
Round-based by theme.
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15 June: Sustainable Farming Incentive 2026
Two windows in 2026: window one from 30 June, window two from September.
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July 3 entries
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14 July: Farming Innovation Programme
Competition rounds through the year.
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14 July: Slurry Infrastructure Grant
Round-based.
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17 July: Water Management Grant
Round-based.
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August 1 entry
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14 August: Model the multi-year trajectory
A recurring step in weed management.
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October 1 entry
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5 October: Farming Equipment and Technology Fund
Round-based, usually open for a defined application period.
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November 2 entries
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12 November: Improving Farm Productivity Grant
Round-based.
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27 November: Environmental Land Management Capital Grants
Round-based, with rapid allocation once open.
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December 2 entries
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5 December: Test and record resistance status
A recurring step in weed management.
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26 December: Countryside Stewardship
Rolling and round-based depending on the tier and option group.
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Free download
Beating Blackgrass Without Chemistry: A Multi-Year Cultural Programme
A practical handbook, written for UK farm businesses, with the sources cited and the working shown. No sales call attached — the guide is the point.
Questions answered
What people ask about Weed Management
Does this replace the software I already use?
Not necessarily. Agrivencia integrates with authoritative sources and mainstream packages rather than insisting on replacing them. Where an incumbent does one job well, the platform connects to it; where the job spans several systems and nobody does it, the platform does it.
Will it work where I have no signal?
Yes. Field capture in Weed Management is offline first, storing locally and synchronising when a connection returns. Only around a fifth of UK farms report reliable signal across the whole holding, so this is a design assumption rather than a feature.
What happens when the scheme rules change?
Scheme rules are held as data rather than code, so a rate change, a cap change or a window closure is a content update that takes effect the same day. The platform also alerts you to what the change does to your own position.
Who owns the data I put in?
You do. The Farm Data Charter gives you a complete export in open formats at any time, and every instance of data sharing requires an explicit, revocable consent that is visible in your account.
Does it work if I farm across a border?
Yes, and that is one of the main reasons the platform exists. A business with land in more than one nation sees one reconciled view rather than two portals, with obligations and deadlines from both administrations in a single calendar.
Can my agronomist or land agent use it too?
Yes. You grant scoped, time-limited access per holding and per module, and you can revoke it in one click. Advisers never get a shared password or a blanket view.
What is the biggest limitation of this module?
Programme abandonment after one difficult season. Mitigated by multi-year trajectory visibility. We would rather state that plainly than let you discover it after signing.
See Weed Management running on your own holding
Thirty minutes, using your parcels, your schemes and your enterprises rather than a sample farm. No obligation and no sales script — if it does not fit your business we will say so.
- Free tier available
- No card required
- Your data stays yours