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I think you are confused with compounds. Please find below. extract from attachment.
Units
Often a recommendation talks about units of a nutrient (eg phosphorus). A unit is the same as kilograms of that nutrient (eg 1 unit P is 1 kg P). But this is not the same as a kilogram of a fertiliser.
N:P:K:S
Fertilisers contain different amounts of nutrients, affecting the amount of the fertiliser you need. The nutrients are often written on the bag or packing slip as percentages, or as N:P:K:S (nitrogen:phosphorus:potassium:sulfur).
Example:
Single superphosphate is 0:8.8:0:11. This means that in 100 kg, there is 8.8 kg phosphorus, 11 kg sulfur. There is no nitrogen or potassium.
Starter 15 is 14:12.7:0:11. This means that in 100 kg, there is 14 kg nitrogen, 12.7 kg P, 11 kg sulfur and no potassium.
Calculating the amount of fertiliser required
This information can be used to calculate the amount of a fertiliser needed for a given amount of a nutrient:
Calculation A
Amount of fertiliser kg/ha = kg/ha nutrient ÷ % nutrient in fertiliser x 100.
Example: You need 20 units (kg) /ha of phosphorus (P) and you plan to use single superphosphate with 8.8% P.
Apply Calculation A
Amount of superphosphate required (kg/ha) = 20 kg/ha P÷ 8.8 P x 100 = 227 kg/ha
Dont worry about SSP or P2O5 etc or any other compound. If the bag says 0:8.8:20, and if the bag is 100 Kg to me what I get out of this 100 KG is only 8.8 KG of P I am not worried what compound this P is. and 20KG of K. Thats it period.
Then what is the balance 70.2 KG. Its “Bhoosa” here we call junk fillers. May be some neutral material. So in a bag of 100 KG if the bag says 0:8.8:20, we are only getting 28.8 KG of nutrients. (here it is P&K). Balance is Bhoosa.
Dont get bogged down by the compounds.
Similarly if the bag says 18:18:18, and if bag is 100kg, then I get 18KG of N, 18 KG of P and 18 KG of K. balance is bhoosa, junk fillers.
Regards
Murali
For easy understanding, I have compiled some Typical specifications of Indian Fertilisers:
STRAIGHT NITROGENOUS FERTILISERS
Ammonium Sulphate
Moisture per cent by weight, maximum 1.0
Ammoniacal nitrogen per cent by weight, minimum 20.6
Free acidity (as H2SO4.) per cent by weight, maximum 0.025
Arsenic as (As2O3) per cent by weight, maximum 0.01
Sulphur (as S) ,per cent by weight, minimum 23.0
Urea (46% N) (While free flowing)
Moisture per cent by weight, maximum 1.0
Total nitrogen, per cent by weight, (on dry basis) minimum 46.00
Biuret per cent by weight, maximum 1.5
Urea (coated) (45% N) (While free flowing)
Moisture per cent by weight, maximum 0.5
Total nitrogen per cent by weight, content with coating, minimum 45.0
Biuret per cent by weight maximum 1.5
Ammonium Chloride
Moisture per cent by weight, maximum 2.0
Ammoniacal nitrogen per cent by weight, minimum 25.0
Chloride other than ammonium chloride (as NaCI) per cent by
weight, (on dry basis) maximum 2.0
Calcium Ammonium Nitrate (25 % N)
Moisture per cent by weight, maximum 1.00
Total ammoniacal and nitrate nitrogen per cent by weight, minimum 25.0
Ammoniacal nitrogen per cent by weight, minimum 12.5
Calcium nitrate per cent by weight, maximum 0.5
Calcium Ammonium Nitrate (26% N)
Moisture per cent by weight, maximum 1.00
Total ammoniacal and nitrate nitrogen per cent by weight, minimum 26.0
Ammoniacal nitrogen per cent by weight, minimum 13.0
Calcium nitrate per cent by weight, maximum 0.5
Anhydrous Ammonia
Ammonia per cent by weight, minimum 99.0
Water per cent by weight, maximum 1.0
Oil content by weight, maximum 20 ppm
Urea Super Granulated
Moisture, per cent by weight, maximum 1.00
Total nitrogen, per rent by weight (on dry basis), minimum 46.00
Biuret per cent by weight, maximum 1.5
Urea (Granular)
Moisture, per cent by weight, maximum 1.00
Total nitrogen, per rent by weight (on dry basis), minimum 46.00
Biuret per cent by weight, maximum 1.5
Urea Ammonium Nitrate (32%) (liquid)
Total Nitrogen, percent by weight, minimum 32.0
Urea Nitrogen, percent weight maximum 16.6
Ammonical Nitrogen, percent by weight, minimum 7.7
Nitrate Nitrogen, percent by weight, minimum 7.7
Specify gravity (at 150 C) 1.32
From ammonia (as NH3) percent by weight, minimum 0.10
STRAIGHT PHOSPHATIC FERTIUSERS
Single Superphosphate (16% P 205 Powdered)
Moisture per cent by weight, maximum 12.0
Free phosphoric acid (as P 205) per cent by weight, maximum 4.0
Water soluble phosphates (as P 205) per cent by weight, min 16.0
Sulphur (as S),percent by weight ,min. 11.0
Single Superphosphate (14% P 205 Powdered)
Moisture per cent by weight, maximum 12.0
Free phosphoric acid (as P 205) per cent by weight, maximum 4.0
Water soluble phosphates (as P 205) per cent by weight, min 14.0
Sulphur (as S),percent by weight ,min. 11.0
Triple Superphosphate
Moisture per cent by weight, maximum 12.0
Free phosphoric acid (as P 205) per cent by weight, maximum 3.0
Total phosphates (as p 205) per cent by weight, minimum 46.0
Water soluble phosphates (as P 205) per cent by weight, minimum 42.0
Single Superphosphate (16% P2O5 Granulated)
Moisture per cent by weight, maximum 5.0
Free phosphoric acid (as P 205.) per cent by weight, maximum 4.0
Water soluble phosphates (as P 205.) per cent by weight, minimum 16.0
Superphosphosphoric Acid (70%) P2O5 (liquid)
Total phosphate (asP2o5)percent by weight, minimum 70.0
Polyphosphate (asP2o5)percent by weight, minimum 18.9
Methanol Insoluble matter, percent weight, minimum 1.0
Magnesium) as Mg0), percent by weight, minimum 0.5
Specific gravity (at 24*c) 1.96
STRAIGHT POTASSIC FERTIlSERS
Potassium Chloride (Muriate of Potash)
Moisture per cent by weight, maximum 0.5
Water soluble potash content (as K20) per cent by weight, minimum 6O.0
Sodium as NaCI per cent by weight (on dry basis) maximum 3.5
Biuret, per cent by weight maximum 1.5
Potassium Sulphate
Moisture per cent by weight, maximum 1.5
Potash content (as K2O) per cent by weight, minimum 50.00
Total chlorides (as CI) per cent by weight, (on dry basis) maximum 2.5
Sodium as NaCI per cent by weight, (on dry basis) maximum 2.0
Sulphur (as S),percent by weight ,min. 17.5
Potassium Schoenite
Moisture per cent by weight, maximum 1.5
Potash content (as K2O) per cent by weight (on dry basis), minimum 23.00
Magnesium oxide (as MgO) per cent by weight, maximum 10.0
Sodium (as NaCI) (on dry basis) per cent by weight, maximum 1.5
Potassium Chloride (Muriate of Potash) (Granular)
Moisture per cent by weight, maximum 0.5
Water soluble potash (as K2O) per cent by weight, minimum 60.00
Sodium (as NaCI), per cent by weight, maximum 3.5
Magnesium (as MgCI2), per cent by weight, maximum 1.0
NP Complex fertilisers
Diammonium Phosphate (18-46-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 18.0
Ammoniacal nitrogen form per cent by weight, minimum 15.5
Total nitrogen in the form of urea per cent by weight, maximum 2.5
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 46.0
Water soluble phosphates (as P 206) per cent by weight, Min 41.0
Ammonium Phosphate Sulphate (16-20-0)
Moisture per cent by weight, maximum 1.0
Total ammoniacal nitrogen per cent by weight, minimum 16.0
Neutral ammonium citrate soluble phosphates (as P 205) %
by weight, minimum 20.0
Water soluble phosphates (as P 205) per cent by weight,minimum 19.5
Sulphur (as S),percent by weight ,min. 11.0
Ammonium Phosphate Sulphate (20-20-0)
Moisture per cent by weight, maximum 1.0
Total nitrogen per cent by weight, minimum 20.0
Ammoniacal nitrogen per cent by weight, minimum 18.0
Nitrogen in the form of urea per cent by weight, maximum 2.0
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 20.0
Water soluble phosphates (as P 205) per cent by weight, minimum 17.0
Sulphur (as S),percent by weight ,min. 13.0
Ammonium Phosphate Sulphate Nitrate (20-20-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 20.0
Ammoniacal nitrogen per cent by weight, minimum 17.0
Nitrate nitrogen per cent by weight, maximum 3.0
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Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 20.0
Water soluble phosphates (as P 205) per cent by weight, minimum 17.0
Sulphur (as S),percent by weight ,min. 13.0
Ammonium Phosphate Sulphate (18-9-0)
Moisture per cent by weight, maximum 1.0
Ammoniacal nitrogen per cent by weight, minimum 18.0
Neutral ammonium citrate soluble phosphates (as P 205) per cent
by weight, minimum 9.0
Water soluble phosphates (as P 205) per cent by weight, minimum 8.5
Nitro Phosphate (20-20-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 20.0
Nitrogen in ammoniacal form per cent by weight, minimum 10.0
Nitrogen in nitrate form per cent by weight, maximum 10.0
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 20.0
Water soluble phosphates (as P 205) per cent by weight, minimum 12.0
Calcium nitrate, per cent by weight, maximum 1.0
Urea Ammonium Phosphate (28-28-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 28.0
Ammoniacal nitrogen per cent by weight, minimum 9.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 28.0
Water soluble phosphates (as P 205) per rent by weight, minimum 25.2
Urea Ammonium Phosphate (24-24-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 24.0
Ammoniacal nitrogen per cent by weight, minimum 7.5
Nitrogen in the form of urea per cent by weight,maximum 16.5
Neutral ammonnium citrate soluble phosphates (as P 205)
per cent by weight, minimum 24.0
Water soluble phosphates (as P 205) per cent by weight, minimum 20.4
Urea Ammonium Phosphates (20-20-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 20.0
Ammoniacal nitrogen per cent by weight, minimum 6.4
Neutral ammonical citrate soluble phosphates (as P 205)
per cent by weight, minimum 20.0
Water soluble phosphates (as P 205) per cent by weight, minimum 17.0
Mono Ammonium Phosphate (11-52-0)
Moisture per cent by weight, maximum 1.0
Total nitrogen all in ammoniacal form per cent by weight,minimum 11.0
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 52.0
Water soluble phosphates (as P 205) per cent by weight, minimum 44.2
Nltrophosphate (23-23-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 23.0
Nitrogen in ammoniacal form per cent by weight, minimum 11.5
Nitrogen in nitrate form per cent by weight, maximum 11.5
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 23.0
Water soluble phosphates (as P 205) per cent by weight, minimum 18.5
Calcium nitrate, per cent by weight, maximum 1.0
Ammonium Nitrate Phosphate (23-23-0)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 23.0
Nitrogen in ammoniacal form per cent by weight,minimum 13.0
Nitrogen in nitrate form per cent by weight, maximum 10.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 23.0
Water soluble phosphates (as P 205) per cent by weight,minimum 20.5
Ammonium Poly-phosphate (10-34-0)(Liquid)
Total Nitrogen (all as Ammoniacal Nitrogen), percent by weight, Minimum 10.0
Total Phosphate (as P2O5) percent by weight minimum 34.0
Poly-phosphate) as P2O5) percent by weight minimum 22.1
Magenesium (as Mg0), percent by weight, minimum 0.5
Specific gravity (at 27oC) 11.4
N.P.K. COMPLEX FERTILISER
Nitrophosphate with Potash (15-15-15)
Moisture per cent by weight, maximum 1.5
Total nitrogen, minimum 15.0
Ammoniacal nitrogen per cent by weight, minimum 7.5
Nitrate nitrogen per cent by weight, maximum 7.5
Neutral ammonium citrate soluble phosphates
(as P 205) per cent by weight, minimum 15.0
water soluble phosphates (asP 205) per cent by weight, minimum 4.0
Water soluble potash (as K2O) per cent by weight minimum 15.0
Calcium nitrate, per cent by weight; maximum 1.0
N.P.K. (10-26-26)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 10.0
Ammoniacal nitrogen per cent by weight, minimum 7.0
Nitrogen in the form of urea per cent by weight, maximum 3.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 26.0
Water soluble potash (as K2O) per cent by weight, minimum 26.0
Water soluble phosphate (as P 205) per cent by weight,minimum 22.1
N.P.K. (12-32-16)
Moisture per cent by weight, maximum 1.0
Total nitrogen per cent by weight, minimum 12.0
Ammoniacal nitrogen per cent by weight, minimum 9.0
Nitrogen in the form of urea per cent by weight, maximum 3.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 32.0
Water soluble potash (as K2O) per cent by weight, minimum 27.2
Water soluble phosphate (as P 205) per cent by weight, minimum 16.0
N.P.K (22-22-11)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 22.0
Ammoniacal nitrogen per cent by weight, minimum 7.0
Urea nitrogen per cent by weight, maximum 15.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 22.0
Water soluble potash (as K2O) per cent by weight, minimum 11.0
Water soluble phosphate (as P 205) per cent by weight, minimum 18.7
N.P.K. (14-35-14)
Moisture per cent by weight, maximum 1.0
Nitrogen in ammoniacal form per cent by weight, minimum 14.0
Neutral ammonium citrate soluble phosphates (as P 205)
per cent by weight, minimum 35.0
Water soluble potash (as K2O) per cent by weight, minimum 14.0
Water soluble phosphate (as P 205) per cent by weight, minimum 29.7
N.P.K. (17-17-17)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 17.0
Ammoniacal nitrogen per cent by weight, minimum 5.0
Urea nitrogen per cent by weight, maximum 12.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 17.0
Water soluble potash (as K2O) per cent by weight, minimum 17.0
Water soluble phosphate (as P 205) per cent by weight, minimum 14.5
N.P.K. (14-28-14)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 14.0
Ammoniacal nitrogen per cent by weight, minimum 8.0
Urea nitrogen per cent by weight, maximum 6.0
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 28.0
Water soluble potash (as K2O) per cent by weight, minimum 14.0
Water soluble phosphate (as P 205) per cent by weight,minimum 23.8
N.P.K. (19-19-19)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 19.0
Ammoniacal nitrogen per cent by weight, minimum 5.6
Urea nitrogen per cent by weight, maximum 13.4
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 19.0
Water soluble potash (as K2O) per cent by weight, minimum 16.2
Water soluble phosphate (as P 205) per cent by weight, minimum 19.0
N.P.K. (17-17-17)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 17.0
Ammonium nitrogen per cent by weight, minimum 8.5
Nitrate nitrogen per cent by weight, maximum 8.5
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 17.0
Water soluble potash (as K2O) per cent by weight, minimum 17.0
Water soluble phosphate (as P 205) per cent by weight, minimum 19.0
N.P.K.(20-10—10)
Moisture per cent by weight, maximum 1.5
Total nitrogen per cent by weight, minimum 20.0
Urea nitrogen percent by weight, minimum 17.1
Ammonical nitrogen percent by weight, minimum 3.9
Neutral ammonium citrate soluble phosphate (as P 205)
per cent by weight, minimum 10.0
Water soluble potash (as K2O) per cent by weight, minimum 10.0
Water soluble phosphate (as P 205) per cent by weight, minimum 8.5
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