The chelating ability of KTPP to iron,calcium and magnesium is studied;The chelating effects of polymeric phosphorus provided by KTPP on medium and trace elements such as water insoluble calcium,magnesium,and iron in 15-15-15 compound fertilizers are investigated.The results indicate that the chelating ability of KTPP for iron,calcium and magnesium is Fe>Mg>Ca by mass,and Mg>Fe ≈ Ca by ions quantity;The optimal process conditions for compound fertilizer are recommended with polymerized phosphorus to total phosphorus mass ratio of 9%,polymerized phosphorus nutrients accounting for 1.35%and KTPP addition amount of 3%.
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