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Specifications/standards

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Specifications against which commercial products are judged for quality. Specifications of several fertilizers have been developed in different countries.

For purchasing fertilizers from international and/or national markets, Specifications have to be indicated. Prices of a specific type of fertilizer may differ according to the required quality and specification.

 

Fertilizers are classified as Straight fertilizers:

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These contain one of the 3 major nutrients N, P, or K. Compound /complex fertilizers: These contain at least two out of the three major nutrients.

 

 

1.  N, P and K Fertilizers

 

  • UREA (Free-flowing)

  • UREA (Granular)

  • AMMONIUM SULPHATE 

  • CALCIUM AMMONIUM NITRATE (CAN)

  • SINGLE SUPERPHOSPHATE (SSP) (Powdered)

  • SINGLE SUPERPHOSPHATE (SSP) (Granular)

  • TRIPLE SUPERPHOSPHATE (TSP)

  • POTASSIUM CHLORIDE/ MURIATE OF POTASH (MOP) (Crystalline powder)

  • POTASSIUM CHLORIDE/ MURIATE OF POTASH (MOP) (Granular)

  • POTASSIUM SULPHATE/SULPHATE OF POTASH (SOP)

  • DIAMMONIUM PHOSPHATE (DAP)

  • NPK COMPLEX 15-15-15 

  • NPK COMPLEX 17-17-17 

  • NPK COMPLEX 19-19-19 

 

      UREA (Free-flowing)

 

  • Moisture content by weight: maximum 1%

  • Total nitrogen content by weight (on dry basis): minimum 46%

  • Biuret content by weight: maximum 1.5%

  • Particle size: Not less than 90% of the material shall pass through 2.8 mm IS sieve and be retained on 1 mm IS sieve.  Not more than 5% shall be below 1 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      UREA (Granular)

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      NOTE: Only when specially requested (for machine application) as it is slightly more expensive than free-flowing Urea

 

  • Moisture content by weight: maximum 1%

  • Total nitrogen content by weight (on dry basis): minimum 46%

  • Biuret content by weight: maximum 1.5%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 2 mm IS sieve. Not more than 5% shall be below 1 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      AMMONIUM SULPHATE

 

  • Moisture content by weight: maximum 1%

  • Total nitrogen content by weight (on dry basis): minimum 20%

  • Free acidity (as H2SO4) by weight: maximum 0.025%

  • Sulphur (as S) by weight: minimum 23%

  • Particle size: Not less than 90% of the material shall pass through 2.8 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      CALCIUM AMMONIUM NITRATE (CAN)

 

  • Moisture content by weight: maximum 1%

  • Total nitrogen content by weight (on dry basis): minimum 26%

  • Ammoniacal nitrogen by weight: 50% of total nitrogen

  • Nitrate nitrogen by weight: 50% of total nitrogen

  • Calcium and/or magnesium carbonate by weight: minimum 18%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      SINGLE SUPERPHOSPHATE (SSP) (Powdered)

 

  • Moisture content by weight: maximum 12%

  • Free phosphoric acid (as P2O5) by weight:  maximum 4%

  • Water-soluble phosphate (as P2O5) by weight: minimum 15.8%

  • Sulphur (as S) by weight: minimum 11%

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      SINGLE SUPERPHOSPHATE (SSP) (Granular)

 

       NOTE: Price may be slightly higher than powdered material. Quotations may be asked for both types and decisions to be taken based on availability and price.

 

  • Moisture content by weight: maximum 5%

  • Free phosphoric acid (as P2O5) by weight:  maximum 4%

  • Water-soluble phosphate (as P2O5) by weight: minimum 15.8%

  • Sulphur (as S) by weight: minimum 11%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and shall be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      TRIPLE SUPERPHOSPHATE (TSP)

 

  • Moisture content by weight: maximum 5%

  • Free phosphoric acid (as P2O5) by weight:  maximum 3%

  • Total phosphates (as P2O5) by weight: minimum 46%

  • Water-soluble phosphate (as P2O5) by weight: minimum 42.5%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and shall be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      POTASSIUM CHLORIDE/ MURIATE OF POTASH (MOP) (Crystalline powder)

 

  • Moisture content by weight: maximum 0.5%

  • Water-soluble potash content (as K2O) by weight: minimum 60%

  • Sodium (as NaCl) by weight: maximum 3.5%

  • Particle size: Not less than 65 % of the material shall pass through 1.7 mm IS sieve and be retained on 0.25 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

 

      POTASSIUM CHLORIDE/MURIATE OF POTASH (MOP) (Granular)

 

      NOTE: Price may be slightly higher than crystalline powder material. Quotations may be asked for both types and decisions to be taken based on availability and price.

 

  • Moisture content by weight: maximum 0.5%

  • Water-soluble potash content (as K2O) by weight: minimum 60%

  • Sodium (as NaCl) by weight: maximum 3.5%

  • Magnesium (as MgCl2) by weight: maximum 1%

  • Particle size: Not less than 90% of the material shall pass through 3.35 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% should be below 1 mm in size.

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

 

      POTASSIUM SULPHATE/SULPHATE OF POTASH (SOP)

 

  • Moisture content by weight: maximum 1.5%

  • Potash content (as K2O) by weight: minimum 50%

  • Total chlorides (as Cl) by weight: maximum 2.5%

  • Sodium (as NaCl) by weight: maximum 2%

  • Sulphur (as S) by weight: minimum 17.5%

  • Particle size: Not less than 65 % of the material shall pass through 1.7 mm IS sieve            and be retained on 0.25 mm IS sieve

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      DIAMMONIUM PHOSPHATE (DAP)

 

  • Moisture content by weight: maximum 1.5%

  • Total nitrogen content by weight (on dry basis): minimum 18%

  • Neutral ammonium citrate soluble phosphate (as P2O5) content by weight: minimum 46%

  • Water-soluble phosphate (as P2O5) content by weight: minimum 41%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm size

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost.

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      NPK COMPLEX 15-15-15

 

  • Moisture content by weight: maximum 1.5%

  • Total nitrogen content by weight (on dry basis): minimum 15%

  • Neutral ammonium citrate soluble phosphate (as P2O5) content by weight: minimum 15%

  • Water-soluble phosphate (as P2O5) content by weight: minimum 12%

  • Water-soluble potash (as K2O) content by weight: minimum 15%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm size

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

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      NPK COMPLEX 17-17-17

 

  • Moisture content by weight: maximum 1.5%

  • Total nitrogen content by weight (on dry basis): minimum 17%

  • Neutral ammonium citrate soluble phosphate (as P2O5) content by weight: minimum 17%

  • Water-soluble phosphate (as P2O5) content by weight: minimum 13.6%

  • Water-soluble potash (as K2O) content by weight: minimum 17%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm size

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

 

      NPK COMPLEX 19-19-19

 

      NOTE:  All other NPK complex grades will follow the same rule, particularly water-soluble phosphate content should be 85% (minimum) of the        neutral ammonium citrate soluble phosphate content.

 

  • Moisture content by weight: maximum 1.5%

  • Total nitrogen content by weight (on dry basis): minimum 19%

  • Neutral ammonium citrate soluble phosphate (as P2O5) content by weight: minimum 19%

  • Water-soluble phosphate (as P2O5) content by weight: minimum 16.2%

  • Water-soluble potash (as K2O) content by weight: minimum 19%

  • Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 1 mm IS sieve. Not more than 5% shall be below 1 mm size

  • Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost

  • Each bag to guarantee minimum product weight (net) as specified on the bag

 

2. Micronutrient Fertilizers

 

      ZINC SULPHATE

 

  • Zinc (as Zn) content by weight: minimum 21%                                                        

  • Sulphur (as S) content by weight: minimum 10%                                                    

  • Lead (as Pb) content by weight: maximum 0.003%                                                 

  • Copper (as Cu) content by weight: maximum 0.1%                                                   

  • Magnesium (as Mg) content by weight: maximum 0.5%                                          

  • Cadmium (as Cd) content by weight: maximum 0.0025%                                         

  • Arsenic (as As) content by weight: maximum 0.01%

  • Matter insoluble in water by weight: maximum 1%

  • pH: not less than 4

  • Form: free-flowing powder

                                                                                                                                   

      CHELATED Zn, AS Zn-EDTA

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  • Zinc content (expressed as Zn) by weight in the form of Zn-EDTA complex: minimum 12%           

  • Lead (as Pb) content by weight: maximum 0.003%                                                      

  • pH: 6.0 – 6.5

  • Form: free-flowing crystalline/powder

                                                                                                                                        

      MANGANESE SULPHATE

 

  • Manganese (as Mn) content by weight: minimum 30.5%                                                

  • Sulphur (as S) content by weight: minimum 17%                                                          

  • Lead (as Pb) content by weight: maximum 0.003%                                                       

  • Copper (as Cu) content by weight: maximum 0.1%                                                       

  • Magnesium (as Mg) content by weight: maximum 2%

  • Matter insoluble in water by weight: maximum 1%

  • pH: not less than 3.75                                                                                                   

  • Form: free-flowing powder                                                                                            

 

      BORAX (SODIUM TETRABORATE)

 

  • Boron (as B) content by weight: minimum 10.5%                                                     

  • Lead (as Pb) content by weight: maximum 0.003%                                                  

  • Matter insoluble in water by weight: maximum 1%

  • pH: 9.0-9.5

  • Form: free-flowing powder                                                                                       

 

      COPPER SULPHATE

 

  • Copper (as Cu) content by weight: minimum 24%                                                               

  • Sulphur (as S) content by weight: minimum 12%

  • Soluble iron and aluminum compounds (expressed as Fe) content by weight: maximum 0.5%      

  • Lead (as Pb) content by weight: maximum 0.003%

  • Matter insoluble in water by weight: maximum 1%

  • pH: not less than 3                                                                                                              

  • Form: free-flowing powder/granular                                                                                      

 

      FERROUS SULPHATE

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  ·Ferrous iron (as Fe) content by weight: minimum 19%

  • Sulphur (as S) content by weight: minimum 10.5%                                                

  • Free acid (as H2SO4) content by weight: maximum 1%

  • Ferric iron (as Fe) content by weight: maximum 0.5%                                             

  • Lead (as Pb) content by weight: maximum 0.003%

  • Matter insoluble in water by weight: maximum 1%

  • PH: not less than 3.5

  • Form: free-flowing powder                                                                                     

 

      CHELATED IRON, AS Fe-EDTA

 

  • Iron content (expressed as Fe) by weight in the form of Fe-EDTA complex: minimum 12%

  • Lead (as Pb) content by weight: maximum 0.003%                                                     

  • pH: 5.5 – 6.5

  • Form: free-flowing crystalline/powder

                                                                                                                                  

      AMMONIUM  MOLYBDATE

 

  • Molybdenum (as Mo) content by weight: minimum 52% 

  • Lead (as Pb) content by weight: maximum 0.003%

  • Matter insoluble in water by weight: maximum 1%

  • pH: 5.0-5.5

  • Form: free-flowing crystalline/powder

 

3. Rock Phosphate (RP)/Phosphate Rock (PR) for Direct Application

 

  • Total phosphates (as P2O5) content by weight: between 15-35% depending on the source

  • Cadmium (as Cd) content by weight: maximum 27 mg/kg of RP

  • Particle size: Not less than 90% of the material shall pass through 0.15 mm IS sieve and the balance shall pass through 0.25 mm IS sieve

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4. Organic Manures

 

      The quality of organic manures varies widely, depending on the materials used. However, basic criteria to consider the suitability of the material as a nutrient source are:

 

  • Organic matter content by weight: minimum 30%

  • Organic carbon content by weight: minimum 12%

  • Total nutrients (N+ P2O5+ K2O) content by weight: minimum 5%

 

      Subject to doubt and availability of analytical facilities, contents of following heavy metals should be checked:

 

  • Arsenic (As) content by weight: maximum 10 mg/kg

  • Cadmium (Cd) content by weight: maximum 5 mg/kg

  • Chromium (Cr) content by weight: maximum 50 mg/kg

  • Copper (Cu) content by weight: maximum 300 mg/kg

  • Lead (Pb) content by weight: maximum 100 mg/kg

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Ammophos
One of the most effective complex fertilizers is ammonium phosphate. It is used in all types of soil as a mineral additive in root and cereal crops. Ammophos fertilizers are also effective in pre-sowing applications. It works faster than other superphosphates because it is easily absorbed by plants. It can be applied in a planned manner, taking into account future effects, as well as urgently when phosphorus deficiencies are evident. Ammophos granular fertilizers have a varied mineral composition, with nitrogen and phosphorus being the most important. These two trace elements are essential components for the healthy growth of any plant species. “Ammophos is a well-known and popular drug among gardeners and agronomists in almost every country. Today, these fertilizers occupy a leading position in the economic industry in the production of mineral fertilizers as well as phosphate fertilizers.
SPECIFICATION

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