Abstract
Phosphorus (P) accumulation on the soil surface and its effect on the concentration of dissolved orthophosphate P (PO4-P) in surface runoff water were studied after three years of surface application of slurry and mineral fertilizer to grass ley on a sandy soil, poor in P. The total amount of P applied was 107–143 kg ha−1>, of which 72–119 kg ha−1> was applied on the soil surface during two or three years without incorporation or mixing. The addition of slurry and mineral fertilizer resulted in an increase in inorganic P in the 0–5 cm but not the 5–25 cm soil layer, but organic P was not affected. The measured changes in inorganic P deviated only by 4–6 kg ha−1> from the values derived from inputs and outputs of P (crop uptake + losses in surface runoff and drainage water). The increase in inorganic-P was accompanied by increases in the degree of P saturation (DPS) and in P extracted with acid am monium acetate (PAc ), sodium bicarbonate (POlsen) and anion-exchange resin (PResin). In surface runoff, 10–18 months after the last surface application of P, the mean flow-weighted concentration of PO4-P was linearly increased with the values of DPS, PAc, POlson and PResin in the 0–5 cm soil layer. PO4-P was lowest (0.033 mg l−1> ) in the control plots and highest (0.62 mg l−1>) in the plot where 143 kg ha−1> P had been applied in slurry and fertilizer. On that plot, the corresponding values of DPS, PAc, POlson and PResin were 16%, 13 mg kg−1>, 85 mg kg−1> and 71 mg kg−1 , even within a few years, and multiply the P loading to surface runoff from the site. A very shallow soil sampling (< 5 cm) is needed to assess P loading potential in a soil where P has been surface-applied.
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Turtola, E., Yli-Halla, M. Fate of phosphorus applied in slurry and mineral fertilizer: accumulation in soil and release into surface runoff water. Nutrient Cycling in Agroecosystems 55, 165–174 (1999). https://doi.org/10.1023/A:1009862227026
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DOI: https://doi.org/10.1023/A:1009862227026