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ISO 18644:2016 Checklist
Section 1: Appearance
1. 1. Is the fertilizer in granular form?
Yes
No
N/A
2. 2. Is it free-flowing (no clumping or sticking)?
Yes
No
N/A
3. 3. Is it visibly free of moisture (no dampness or caking)?
Yes
No
N/A
4. 4. Is it free of foreign matter (e.g., debris, contaminants)?
Yes
No
N/A
Section 2: Nutrient Content
1. 1. For single nutrient fertilizers (e.g., N, P, or K only): Is the mass fraction ≥ 18%?
Yes
No
N/A
2. 2. For compound fertilizers: Is the total nutrient content (N + P₂O₅ + K₂O) ≥ 20%?
Yes
No
N/A
Section 3: Particle Size
1. 1. Are at least 90% of particles within the 1.00 mm to 4.75 mm range?
Yes
No
N/A
2. 2. Are oversized (>4.75 mm) or undersized (<1.00 mm) particles minimal (<10%)?
Yes
No
N/A
Section 4: Controlled-Release Nutrients
1. 1. Does the controlled-release fertilizer meet the requirements from below and the values declared on the containers? • Is the mass fraction of total nutrient (N + P2O5 + K2O) ≧ 20%? • Is the particle size (1.00 mm to 4.75 mm) ≧ 90%? • Is the nutrient release period equal to the marked value? • Is the initial release rate of nutrients ≦ 15%? • Is the cumulative release mass fraction of nutrients in 28 days ≦ 75%? • Is the cumulative release mass fraction of nutrients during the nutrient release period ≧ 75%?
Yes
No
N/A
Section 5: Appearance Testing
1. 1. Is appearance assessed visually by trained personnel?
Yes
No
N/A
2. 2. Are observations documented consistently (e.g., color, texture)?
Yes
No
N/A
Section 6: Nutrient Testing
1. 1. Total nitrogen: Is it tested per ISO 5315 (e.g., Kjeldahl method)?
Yes
No
N/A
2. 2. Phosphorus (P₂O₅): Is it tested per ISO 6598 (e.g., spectrophotometric method)?
Yes
No
N/A
3. 3. Potassium (K₂O): Is it tested per ISO 17319 (e.g., flame photometry)?
Yes
No
N/A
Section 7: Particle Size Testing
1. 1. Is grain size measured using sieving per ISO 8397?
Yes
No
N/A
2. 2. Is equipment calibrated and maintained?
Yes
No
N/A
Section 8: Release Rate Testing
1. 1. Is the nutrient release rate tested per EN 13266?
Yes
No
N/A
2. 2. Is the test conducted at the temperature specified on the label (e.g., 20°C, 25°C)?
Yes
No
N/A
3. 3. Are multiple samples tested to ensure consistency?
Yes
No
N/A
Section 9: Sampling
1. 1. Is sampling performed per ISO 8633 (solid fertilizers sampling)?
Yes
No
N/A
2. 2. Are tools/techniques used to avoid damaging coatings (e.g., gentle scooping)?
Yes
No
N/A
3. 3. Is sample reduction done per ISO 7742:1988 using riffle dividers or quartering?
Yes
No
N/A
Section 10: Sample Handling
1. 1. Are laboratory samples approximately 1 kg in total mass?
Yes
No
N/A
2. 2. Are samples split into two portions (one for analysis, and one for storage)?
Yes
No
N/A
3. 3. Are samples stored in airtight containers to prevent moisture ingress?
Yes
No
N/A
4. 4. Are the laboratory samples labeled according to ISO 7410, including: • Manufacturer name? • Product name and type? • Manufacturer’s reference and batch number or production date? • Lot size? • Date and place of sampling? • Signature of sampler and person from whose premises the sample was taken? • Stated release period (days) and temperature?
Yes
No
N/A
5. 5. Are stored samples retained for at least 6 months?
Yes
No
N/A
Section 11: Labeling And Marking
1. 1. Does the label include "controlled-release" or "coated controlled-release" as applicable?
Yes
No
N/A
2. 2. Is the terminology consistent with product type (e.g., fully vs. partly controlled-release)?
Yes
No
N/A
Section 12: Nutrient Content
1. 1. Is the total nutrient content (e.g., % N, P₂O₅, K₂O) clearly marked?
Yes
No
N/A
2. 2. Does it match the test results?
Yes
No
N/A
Section 13: Fertilizer Formula
1. 1. Is the N-P-K formula (e.g., 20-10-10) specified?
Yes
No
N/A
Section 14: Release Information
1. 1. Is the release period stated (e.g., 3 months, 6 months)?
Yes
No
N/A
2. 2. Is the testing temperature for release specified (e.g., 25°C)?
Yes
No
N/A
3. 3. (Optional) Are practical release curves provided?
Yes
No
N/A
Section 15: Partly Controlled-Release
1. 1. Are the specific controlled-release nutrients (e.g., coated N) identified?
Yes
No
N/A
2. 2. Are their contents (e.g., 50% of total N) stated?
Yes
No
N/A
Section 16: Regulatory Compliance
1. 1. Does labeling meet ISO 7409 requirements (e.g., clear, durable marking)?
Yes
No
N/A
2. 2. Does it comply with national/regional regulations?
Yes
No
N/A
Section 17: Packaging
1. 1. Is the net mass declared on the package (e.g., 25 kg)?
Yes
No
N/A
2. 2. Is the declared mass verifiable and consistent with contents?
Yes
No
N/A
Section 18: Transport
1. 1. Are procedures in place to protect against moisture (e.g., waterproof covers)?
Yes
No
N/A
2. 2. Are packages shielded from direct sunlight during transit?
Yes
No
N/A
3. 3. Are measures taken to prevent physical damage (e.g., stacking limits)?
Yes
No
N/A
Section 19: Storage
1. 1. Is the storage area dry (e.g., humidity controlled)?
Yes
No
N/A
2. 2. Is it cool (e.g., below specified max temperature)?
Yes
No
N/A
3. 3. Is it protected from sunlight (e.g., shaded or indoor)?
Yes
No
N/A
4. 4. Are packages kept away from moisture sources (e.g., no leaks)?
Yes
No
N/A