TOLERANCE LIMIT IN PLANT NUTRIENTS AND PHYSICAL PARAMETERS
FOR VARIOUS FERTILISERS

 

1. For Fertilizers with definite compounds like ammonium sulphate, Urea, Ammonium chloride, Muriate of Potash, Sulphate of Potash Superphosphate, Dicalcium Phosphate, Sulphur Powder and Sulphur Granular

 containing more than 20 per cent nutrients

 

0.2

containing less than 20 per cent nutrients

0.1

2. Calcium ammonium nitrate

0.3

3. DAP

** 0.5 units each for N & P contents

 

4. Nitrophosphates, ammonium sulphate nitrate Urea ammonium phosphate, Ammonium phosphate sulphate, bonemeal, granulated mixture, compound/complex fertilizer/ 100% Water soluble fertilizer/physical mixtures of fertilizers (NPK Mixtures), Mixtures of NPK with Micronutrients

 tolerance varies with nutrient level in fertilizer subject to maximum of 2% for all combine nutrients.

 

Nutrient level(%)

Tolerance level (unit)

15 or less

0.5

16 to 20

0.6

21 or more

0.7

 

5. Borax, Chelated Zinc- EDTA and Chelated Iron-EDTA

 0.1

6. Solubor, Copper sulphate, Zince Sulphate manganese sulphate and ferrous sulphate

0.2

7. Ammonium molybdate

 0.5

8. Magnesium Sulphate

 0.1

 

9.Mixture of micronutrient Fertilizer

Tolerance varies with combined nutrient level in Fertilizer

 

Nutrient level (%)

10 or less

11 to 20

21 or more

Tolerance level (unit) 

 0.1

0.2

0.5

10. Particle size

 

 3 units

11. Moisture

 

0.3 units

12. Customized & Fortified Fertilizers

For Primary nutrients (NPK) and secondary nutrients (S,Ca, Mg)

Upto 15

16-20

>20

(For Micronutrients)

Upto 1.0 total combined units

>1,0 total combined units

 

 

0.5

0.6

0.7

 

0.1

0.2

 

Note:

(a)    In serial No. 4,the term nutrient besides NPK also includes Sulphur

(b)   the term nutrient in serial number 1, 2, 3, 5, 6, 7 and 8 includes N, P, K, S. Ca, Mg, Fe, Mn, Zn, Cu, B and Mo.

(c)    In case of fertilizers where ‘Sulphur’ has been specified in the specification under Schedule I Part A, the tolerance limit shall be same as prescribed under serial No. 1, 6 and 8 independently for each nutrient.

 

Note:   for the purpose of entry 12

(1)   the minimum level of Sulphur in customized fertilizers as well as in fortified fertilizers should not be less than 4.0% and the minimum level of micronutrients in such fertilizers should be minimum 0.2 %.

(2)   the tolerance limit shall also be applicable on the forms of nutrients and in all the customized/fortified fertilizers, the forms of nutrients should also be specified along with the total nutrients.