Crop use and profile distribution of phosphorus in soils that developed on mafic rocks in southern Portugal

Monteiro, M.C.H.; Monteiro, Fernando; Madeira, Manuel; Torrent, J.

http://hdl.handle.net/10400.11/6188

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Abstract(s)

The phytoavailability of soil phosphorus (P) depends on the different forms in which it occurs and how these forms change after the application of P fertiliser to the soil. Forms of P in the A, B and C horizons of eleven pedons that developed on mafic rocks were characterised by a fractionation method before and after fertilisation with single superphosphate, and a micropot experiment was conducted to assess the shortterm use of P fertiliser by rye (Secale cereale L.). The main sources of P to the crop were (i) phosphate adsorbed on mineral surfaces and pedogenic Fe, Al or Ca phosphates in the A horizon and (ii) Ca-phosphates in B and C horizons. In the C horizons, poor in Fe/Al phases and clay, the precipitated Ca-P showed low solubility, resulting in a reduction in shot biomass. The apparent P recovery by rye was similar in the A (36%) and B (29%) but decreased in the C (15%) horizons. The partial factor productivity (g g−1) decreased from the A (58) to B (11) and C (5) horizons. P phytoavailability decreased with increasing profile depth because the transformation of P fertiliser to poorly soluble Ca-P forms increased with depth.

Keywords

Olsen P Phosphorus phytoavailability Phosphorus forms Soil phosphorus sinks Soil phosphorus sources

URI

http://hdl.handle.net/10400.11/6188

Citation

Monteiro, M.C.H. [et al.] (2018). Crop use and profile distribution of phosphorus in soils that developed on mafic rocks in southern Portugal. Archives of Agronomy and Soil Science. ISSN 1476-3567 online. P. 1-13.