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28 October 2016 Fertilizer-induced phosphorus dynamics in alkaline-calcareous soils as influenced by soil chemical properties
D.M.S. Duminda, Darshani Kumaragamage, Srimathie P. Indraratne, Don Flaten
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Abstract

For proper fertility management, the influence of soil properties on phosphorus (P) dynamics with fertilizer application should be better understood. We examined the influence of soil chemical properties on P dynamics with the application of monoammonium phosphate (MAP) to alkaline-calcareous soils from Manitoba. Nonfertilized and MAP-fertilized soils (at 30 and 60 kg P ha-1) were incubated for 8 wk. At 2 wk intervals, we analyzed pore water samples for dissolved reactive P (DRP) concentration, and soil samples for Olsen P (OP) and Mehlich-3 P (M3P) concentrations. Change in pore water DRP concentration with fertilizer application varied from a slight decrease (-0.02 mg L-1) to a significant, large increase (3.1 mg L-1) and showed a significant, negative relationship with P sorption capacity. The increase in OP and M3P with fertilizer application was influenced by the rate of P applied, initial soil test P and P sorption capacity. The estimated mean OP and M3P to maintain pore water DRP concentration at 0.2 mg L-1 were 25 and 48 mg kg-1, respectively. Fertilizer application at the same rate resulted in a widely varying degree of P saturation (DPS) increment depending on soil properties, indicating the importance of monitoring DPS changes for sustainable fertilizer use.

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D.M.S. Duminda, Darshani Kumaragamage, Srimathie P. Indraratne, and Don Flaten "Fertilizer-induced phosphorus dynamics in alkaline-calcareous soils as influenced by soil chemical properties," Canadian Journal of Soil Science 97(2), 159-170, (28 October 2016). https://doi.org/10.1139/cjss-2016-0055
Received: 27 May 2016; Accepted: 1 October 2016; Published: 28 October 2016
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