Phosphate movement in surface run-off water

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Abstract
Intense simulated rainfall was applied to small plots topdressed in strips with aerial superphosphate at 4 cwt per acre to determine how much and, within the limits of the apparatus, how far the water-soluble fraction could be moved down slope in surface run-off water. It was found that 3 in. of rainfall (2 in. of run-off) in 1 hr could remove 28% of the fertiliser placed in a 3 in. wide band at a distance of 21/4-21/2 ft up slope from a collecting tray. Bands at 0–3 in. and 6–9 in. up slope from the tray resulted in a greater proportion of fertiliser being collected. There is clearly a need for extension of this trial, using longer slopes with less intense and/or less prolonged rainfall and also studying the effect of time interval after fertiliser application, before conclusions of practical significance can be drawn.

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