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Reactions of Phosphorus Fertilizers with and without a Fertilizer Enhancer in Three Acidic Soils with High Phosphorus‐Fixing Capacity
Author(s) -
Pierzynski Joy,
Hettiarachchi Ganga M.
Publication year - 2018
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2018.01.0064
Subject(s) - fertilizer , soil water , phosphorus , chemistry , diammonium phosphate , andisol , lability , ultisol , monocalcium phosphate , phosphate , soil ph , agronomy , oxisol , environmental chemistry , environmental science , soil science , biochemistry , organic chemistry , biology , fishery , fish <actinopterygii> , fish meal
Core Ideas Greater movement of P was observed for the P liquid treatments than for the granular treatments. The addition of a fertilizer enhancement product (FEP) did not consistently increase P mobility in the soils. The effects of the P source and the FEP added on the lability and speciation of P in the soils were variable. Phosphorus lability was enhanced when Fe‐adsorbed P species was prevalent in the fertilized section. Limited P availability for plants in acidic soils is one of the key factors limiting crop production in many areas of the world. In this study, we investigated the mobility and availability of P in three different soil types (an Oxisol, an Andisol, and an Ultisol) and the fertilizer reaction products formed from three fertilizers: monoammonium phosphate (MAP), diammonium phosphate (DAP), and ammonium polyphosphate (APP). Additionally, we compared the effects of the fertilizers alone and enhanced with a fertilizer enhancement product (FEP) in the three soils. Soils were incubated for 5 wk in Petri dishes under seven treatments: each fertilizer with and without FEP, plus the unfertilized control. After incubation, soil samples were collected at varying distances from the point of P application. Measurements included soil pH, total P, resin‐extractable P, scanning electron microscope‐energy dispersive X‐ray analysis of the P granules, and P reaction products measured via X‐ray absorption near‐edge structure spectroscopy (XANES). Phosphorus mobility with granular fertilizers was limited in the three soils but was enhanced in two for the liquid P treatments. The addition of FEP did not increase P mobility. Phosphorus source had variable effects on P lability for the three soils. The FEP produced greater P lability when combined with APP for one soil. Speciation influenced P lability in the soils in that increased Fe‐ and Fe‐adsorbed P increased P extractability. There was not a consistent benefit of adding the FEP on the acidic high P‐fixing soils.