Organic Manure 1. Moisture, per cent by weight, Maximum 25 2. Particle size minimum 90% material Should Pass through 4.0 mm IS Sieve 3. Bulk density (g/cm 3) Less Than 1.0 4. Total Organic carbon, Minimum 14.5 5. Total of nitrogen (as N), Minimum 0.5 6. Total Phosphate (as P2O5) Minimum 0.5 7. Total Potash (as K2O) Minimum 0.5 8. NPK Nutrients â??Total N,P2O5 And K2O Nutrients Not Less than 3% 9. C: N ratio 20:1 10. PH Maximum 6.7-7.5 11. Conductivity (as dSm-1) 4.0 12. Heavy metal content, (as mg / Kg) maximum Arsenic (as As2 O3) 10.00 Cadmium (as Cd) 5.00 Chromium (as Cr) 50.00 Copper (as Cu) 300.0 Mercury (as Hg) 0.15 Nickel (as Ni) 50.00 Zinc (as Zn) 1000.00