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Chemical and Biological Technologies in Agriculture

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
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