Product labelsUpdated 22 days ago
Different local regulations define the various ways in which similar content is labelled. Therefore, the label on the bottle may differ from what is published online. In the EU, your labels may look like this:
| APT1 | APT3 | APT e |
| Liquid inorganic macronutrient fertiliser. NPK (Mg) fertiliser with micronutrients and trace amounts of Boron (B), Copper (Cu), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn). 0-0-7 (+1.4) 7% Total Potassium oxide (K2O) 1.4% Magnesium oxide (MgO) 0.09% Total Iron chelated by EDTA, DTPA and EDDHA. All nutrients are completely water soluble. Ingredients: Potassium sulphate (CMC1 CAS n°7778-80-5) Potassium chloride (CMC1 CAS n°7447-40-7) Magnesium sulphate (CMC1 CAS n°7487-88-9) | Liquid inorganic macronutrient fertiliser NPK (Mg) fertiliser with micronutrients and trace amounts of Boron (B), Copper (Cu), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn). 0.7-0.9-7 (+1.6) 0.7% Total Nitrogen (N) 0.7% nitric nitrogen 0.9% Total Phosphorus pentoxide (P2O5) 7% Total Potassium oxide (K2O) 1.6% Magnesium oxide (MgO) 0.09% Total Iron chelated by EDTA, DTPA and EDDHA. All nutrients are completely water soluble. Ingredients: Potassium sulphate (CMC1 CAS n°7778-80-5) Potassium chloride (CMC1 CAS n°7447-40-7) Magnesium nitrate (CMC1 CAS n°10377-60-3) Magnesium sulphate (CMC1 CAS n°7487-88-9) Potassium phosphate (CMC1 CAS n°7778-77-0) | Liquid inorganic macronutrient fertiliser NPK (Mg) fertiliser with micronutrients and trace amounts of Boron (B), Copper(Cu), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn). 1.6-1.7-8.5 (+1.6) 1.6% Total Nitrogen (N) 1.6% nitric nitrogen 1.7% Total Phosphorus pentoxide (P2O5) 8.5% Total Potassium oxide (K2O) 1.6% Magnesium oxide (MgO) 0.18% Total Iron chelated by EDTA, DTPA and EDDHA. All nutrients are completely water soluble. Ingredients: Potassium sulphate (CMC1 CAS n°7778-80-5) Potassium chloride (CMC1 CAS n°7447-40-7) Magnesium nitrate (CMC1 CAS n°10377-60-3) Magnesium sulphate (CMC1 CAS n°7487-88-9) Potassium phosphate (CMC1 CAS n°7778-77-0) |
In addition, the data online represents the latest values, which may differ from earlier batches.
On some bottles, the contents of APT are listed in percentages.
On others, in ppm. Why is this so?
Per fertiliser regulations, newer APT labels generally show content in percentages (e.g 0.7% Total Nitrogen) Older labels list certain compounds in ppm (e.g. 5ml per 100L adds 1.8ppm NO3 )
They look different because they are stating different things.
1.8ppm of NO3 refers to a specific compound (NO3), and at the specific concentration of 5ml per 100L.
0.7% Total Nitrogen refers to the nitrogen element only (in the bottle) and calculated per regulatory requirements on how 'Total Nitrogen' is defined (in the same way that the food industry has continually evolving regulations that determine how, say, 'protein' is defined)
In summary, old 'ppm' labels represented the contents in hobbyist vernacular. Newer labels reflect current fertiliser regulations.