How Should Your Tender Specify a Soil Health Input?
A tender for a soil health input should specify the result the programme is buying, not a brand and not just a nutrient grade. Write down the function you need, the safety limits and documents every bidder must provide, the field evidence you will accept, and then compare offers on cost per hectare covered rather than price per tonne.
A tender only buys what its specification can measure.
If you run a ministry input scheme or a donor-funded soil programme, the specification is where value is won or lost. It is often copied from the last fertiliser tender, and it decides every bag that reaches a farm.
Why fertiliser specs miss soil health inputs
Most fertiliser law, and so most tender templates, is built around nutrient content. In West Africa, ECOWAS Regulation C/REG.13/12/12 on fertilizer quality control, signed on 2 December 2012, defines a fertiliser as a substance intended as a nutrient source for crops. Its definition of a natural organic fertiliser requires a declaration of nutrient value on the label. Quality control then checks that labels are truthful, that bags are not short weight and that nutrients are not below tolerance.
That works for buying NPK 15-15-15. It does not tell you whether an input helps the crop take up the nutrients you already pay for. A humic soil input is judged by what it does in the soil, so a spec listing only N, P and K percentages either excludes it or lets any nice label through.
The same regulation rests on truth in labelling: whatever a seller claims, they must guarantee. A misleading label is misbranding; heavy metals above the allowable limits are adulteration. Write your spec so every bidder's claim becomes a checkable promise.
Describe the function, not the brand
The World Bank's Procurement Regulations for IPF Borrowers (7th edition, September 2025) are clear on this. Paragraph 5.26 says specifications shall be based on relevant technical characteristics and/or performance requirements, and brand names should be avoided; where one is truly needed, "or equivalent" must follow it. Paragraph 5.25 asks for internationally accepted standards, while accepting equivalent ones.
So do not write "Product X". Write what the product must do and prove: for example, an organic input that improves nutrient-use efficiency alongside a reduced mineral fertiliser programme, with replicated field data on your crops.
Six clauses for a soil health input specification
Function: the effect claimed, for each target crop, in the words on the label.
Regulatory status: the product's registration or conformity under the law where it is made, and the importing country's requirements.
Safety: a recent independent analysis of heavy metals and, for organic materials, pathogens, against the national or regional limits you name.
Composition and consistency: a lab analysis of organic matter, humic substances and nutrients, plus how the maker keeps batches consistent.
Field evidence: replicated trials against a full-fertiliser control, read on the least significant difference, ideally on your crops and in a similar climate.
Use instructions: rate, timing and the mineral fertiliser programme it is meant to accompany.
Clause five matters most: a spec that accepts testimonials buys the best marketing, not the best agronomy. As I argued in why Africa's fertiliser crisis is really an allocation crisis, the scarce resource is fertiliser that actually reaches and feeds the crop.
Evaluate cost per hectare, not price per tonne
Paragraph 5.12 of the same regulations lets borrowers add sustainability requirements, normally scored with non-price criteria stated in the tender documents. Use that room. Ask each bidder for a priced programme per hectare: the input plus the mineral fertiliser it is designed to work with.
The arithmetic is simple. If an input lets a programme cut mineral fertiliser by 25% without losing yield, the same fertiliser stock covers about 30 to 33% more hectares. At 50%, it covers twice the hectares. That is arithmetic, not a yield promise, so the evidence clause has to carry it.
At Sapropel Organics we make HUMUSON in the EU under Regulation (EU) 2019/1009, with ECOCERT organic-input certification per product. In three seasons of tobacco trials with the Tobacco Research Board in Zimbabwe, 75% and 50% fertiliser plus HUMUSON stayed within the least significant difference of the full programme. Under tested conditions it can support a 25 to 50% cut in mineral NPK, but it does not replace N, P and K, and alone it yielded clearly less.
The takeaway
A soil health tender should buy a measurable result: a stated function, documented safety, consistent composition and field evidence, priced per hectare covered. That widens competition and keeps out products that only look good on a label. If you run or implement a soil-health or input programme and want our trial reports and product documentation to test your draft specification against, let's talk.
Related questions
Can a tender name a specific fertiliser brand? Under World Bank rules only to clarify an incomplete spec, and then followed by "or equivalent".
Should soil health inputs be scored on price alone? No: non-price criteria stated in the tender let you score evidence and cost per hectare.
Who checks fertiliser quality in West Africa? Member States, through inspectors and designated laboratories under the ECOWAS regulation.
Sources
ECOWAS Regulation C/REG.13/12/12 relating to fertilizer quality control in the ECOWAS region
World Bank Procurement Regulations for IPF Borrowers, 7th edition, September 2025
1reading now
Written by
AurimasSoil regeneration / organic fertilizer (Agronomy)27 pieces · 17 followersFollow Aurimas to see new posts in your feed, on your phone or by email.
- views
