Chemical and Biological Technologies in Agriculture

Table 1 Total and water-soluble (W) Fe % and P (P₂O₅) %, in the Fe- and P-sources used in the manufacture of NPK compound fertilizer

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

Products	Total Fe %	W-Fe %	Total P %^a	W-P %^a
Fe products
FeHEDTA	13.0	13.0	–	–
FeDTPA	11.9	11.9	–	–
FeEDTA	14.1	14.1	–	–
FeSO₄	20.1	20.1	–	–
Fe₂O₃	69.9	0	–	–
P products
DAP	0.182	0.022	46.5	43.8
TSP	0.175	0.025	46.4	39.1

Fe in DAP and TSP results from its presence in the raw materials used to DAP and TSP manufacture process (mainly, in phosphoric acid and rock phosphate)
^aP is expressed as P₂O₅

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