Pyrophosphate Hydrolysis in Flooded Soil
1971
Hossner, L. R. | Phillips, D. P.
Rate of hydrolysis of pyrophosphate, applied as (NH₄)₃-HP₂O₇·H₂O, was measured in four soils under flooded and ⅓ atm moisture content. Hydrolysis was faster under flooded conditions than at ⅓ atm moisture. Pyrophosphate hydrolysis was determined to be a first-order reaction under flooded conditions but not at ⅓ atm moisture content. The first-order rate constants under flooded conditions ranged from 2.09 × 10⁻⁵ min⁻¹ to 1.43 × 10⁻⁴ min⁻¹ depending upon the soil and temperature of incubation. Half-life values for applied pyrophosphate varied from 0.6 to 3.9 days. The activation energy for pyrophosphate hydrolysis under flooded soil conditions was calculated to be 4,500 cal/mole for a Katy sl soil.
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