Ammonium Pyrophosphate and Ammonium Orthophosphate as Phosphorus Sources: Effects of Soil Temperature, Placement, and Incubation
1971
Engelstad, O. P. | Allen, S. E.
Triammonium pyrophosphate [(NH₄)₃HP₂O₇] was found to be less effective than monoammonium orthophosphate [NH₄H₂PO₄] when both were freshly added as sources of P for corn (Zea mays L.) grown in cool soil (16C). No difference in effectiveness was found between these sources when freshly applied to warm soil (24C). Incubation prior to planting reduced the effectiveness of both sources, particularly when the soil was warm during the incubation period.
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