Nutrient Formula and Labelled Value配合式与标明值
A nutrient formula expresses the content of the three macro elements in the form N-P₂O₅-K₂O — for example 15-15-15 means 15% nitrogen, 15% available phosphorus pentoxide and 15% potassium oxide. The labelled value is the nutrient content declared on the package and is itself one of the criteria against which the product is judged.
Key points
- The total nutrient content should equal the sum of the individual nutrients, and compound and blended fertilizers must declare an N-P₂O₅-K₂O formula (GB 18382-2021).
- Under GB/T 15063-2020, no single nutrient may be below 4.0%, and the absolute value of the negative deviation of a measured single nutrient from the labelled value must not exceed 1.5%.
- It is not permitted to declare nutrient content by splitting the contents of the package — for example declaring 20% organic matter in the black granules and 25% total nutrients in the grey granules.
- Where secondary or micro elements are declared, each element and its content must be named; secondary elements below 2% and micro elements below 0.02% must not be declared.
Related terms
Compound Fertilizer
A compound fertilizer is a fertilizer containing at least two of the thr…
Secondary and Micro Elements
Secondary elements are calcium, magnesium and sulphur — required in smal…
Bulk Blending Fertilizer (BB Fertilizer)
Bulk blending fertilizer, abbreviated as BB fertilizer, is a fertilizer …
More in this category
Biuret
Biuret is an impurity formed when two molecules of urea condense at elev…
Chloride-sensitive Crop
Chloride-sensitive crops are those affected in yield or quality by the a…
Nitrate Nitrogen and Ammonium Nitrogen
Nitrate nitrogen (NO₃⁻-N) and ammonium nitrogen (NH₄⁺-N) are the two ino…
- Category：Quality and labelling
- Definition basis：GB 18382-2021 Fertilizer Marking — Content and Requirements
Updated：Oct 16, 2026