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Table 2 Total and water-soluble contents of Fe (%) and P2O5 (%) in compound fertilizers after the manufacturing process (Fe %:P2O5 % ratio of 0.1:10 in NPK formula)

From: Incorporation of humic-derived active molecules into compound NPK granulated fertilizers: main technical difficulties and potential solutions

Fertilizers Fe (%) P2O5 (%)
Total Water Total Water
I
 FeSO4:TSP 0.82 0.032 47.5 40.8
 FeSO4:DAP 0.85 0.022 46.5 43.0
 Fe2O3:TSP 0.34 0 47.1 41.3
 Fe2O3:DAP 0.38 0 45.5 44.0
II
 FeEDTA:TSP 0.70 0.50 46.5 40.2
 FeEDTA:DAP 0.84 0.48 45.5 43.2
 FeDTPA:TSP 0.77 0.49 45.0 39.4
 FeDTPA:DAP 0.69 0.45 44.4 41.2
 FeHEDTA:TSP 0.70 0.41 46.3 38.8
 FeHEDTA:DAP 0.70 0.42 44.7 42.2
 Fe–HA:TSP 0.80 0 45.0 40.0
 Fe–HA:DAP 0.91 0 44.6 39.8
  1. TSP (triple superphosphate) and DAP (diammonium phosphate) are P sources in NPK fertilizers
  2. I inorganic Fe sources; II Fe chelates and Fe–humic complexes