Abstract
The effects of superphosphate (50 kg P ha−1), applied as a liquid or a solid, on the transport of dissolved and particulate P in surface runoff from established pasture were evaluated using field plots and natural rainfall. An approximately 3-fold increase in the transport of both dissolved inorganic P and particulate P in surface runoff was measured in 14 weeks following fertilizer application in the solid form (2.9 and 2.9 % of the applied fertilizer P, respectively) compared to the liquid application (1.0 and 1.1 % of the applied fertilizer P, respectively). In addition, the application of solid fertilizer P had a more sustained effect on the concentration of both disolved and particulate P in surface runoff. The results are discussed in terms of the relative abilities of the applied fertilizers to move away from the zone of interaction between surface soil and runoff, their effect on the P enrichment of streams, and their agronomic effectiveness.
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