Why do fertilisers need a label?
Fertiliser labels contain vital information to help agronomists and farmers decide about nutrients for optimal crop yield and quality while caring for the environment and food safety.
While most fertilisers are not classified as dangerous goods, some products are scheduled poisons or hazardous substances. Labels provide this information so people transporting and handling the products stay safe.
Fertiliser labels also aid traceability, a requirement of quality assurance schemes such as Freshcare.
What should be on the fertiliser label?
Agronomists and farmers use fertiliser labels to determine the best product to meet their needs. We call this the four Rs:
- Right nutrient or product
- Right rate
- Right application method
- Right timing
That’s why it’s important that fertiliser labels are descriptive and include all relevant information, such as the plant nutrients contained in a fertiliser, the form of the nutrient and its concentration. Nutrients may only be included on the label if they meet or exceed the concentrations in the tables below.
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Minimum nutrient concentrations in solid fertilisers
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Nutrient
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Minimum (% w/w)
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N, P, K, S, Ca, Mg, Si
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0.5
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Fe
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0.1
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Cu, Mn, Zn
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0.05
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B
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0.02
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Mo, Co, Se
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0.001
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Minimum nutrient concentrations in liquid fertilisers and soluble solids intended only for use in solution.
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Nutrient
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Minimum (% w/w)
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N, P, K, S, Si
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0.1
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Ca, Mg
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0.1
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B, Cu, Fe, Mn, Zn,
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0.005
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Co, Se, Mo
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0.001
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Fertilisers can also contain contaminants that can accumulate in the food chain. Inorganic fertiliser labels should provide warnings on impurities when they exceed a “trigger concentration.” These contaminants include cadmium, lead, mercury, fluorine and biuret. Maximum permissible concentrations (MPCs) have been set for impurities of concern. It is often impossible to know if poorly labelled products exceed MPCs without a chemical analysis of the product.
So, what can go wrong?
There have been cases where the quality of imported fertiliser has not matched the certificate of analysis provided by the supplier. In one case, cadmium levels far exceeded the maximum permissible concentration. In another, the “fertiliser” appeared to be simply soil. Usually, these issues are managed by the manufacturer’s and importer’s QA systems, including sampling and product analysis.
Fertilizer Australia members must have QA systems in place and labelling that meets the National Code of Practice for Fertilizer Description & Labelling. This means you can purchase fertiliser products from Fertilizer Australia members with confidence. The National Code of Practice for Fertilizer Description and Labelling is here.