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Do Decomposing Organic Matter Residues Reduce Phosphorus Sorption in Highly Weathered Soils?

^a School of Rural Science and Agriculture, The Univ. of New England, Armidale, NSW, Australia, 2351
^b School of Land and Food Sciences, The Univ. of Queensland, St Lucia, QLD, Australia, 4067
^c Queensland Dep. of Natural Resources, Mines and Energy, 80 Meiers Rd, Indooroopilly, QLD, Australia, 4068

View larger version (12K): [in a new window]   Fig. 1. Effects of incubated soybean (SB) or Rhodes grass (RG) leachate and P applied on the P sorption after 1.5 h of an Oxisol (OX1) soil (____ Control; SB: _ __ _ 0.2 mL, ...... 2 mL; RG: ---- 0.2 mL, ... ... 2 mL). Significant differences in curves- Control: Psb = 101(±14) log Psln – 69(±29); 2 mL SB Psb = 141(±17)*log Psln – 98(±31) where Psb indicates P sorbed and Psln indicates P in solution.

View larger version (24K): [in a new window]   Fig. 2. Effects of 0.2 mL addition of soybean (SB) leachate and P on the P sorption of two Oxisols (OX1 and OX2), an Ultisol (ULT) and a Vertisol (VERT) after 1.5 h (____ Control; _ __ _ SB) and 6 d (____ Control; _ _ _ _ SB). Significant differences in curves– OX1 curves- Control Psb = 65(±5) log Psln + 53(±3); SB Psb = 92(±4)** log Psln + 71(±1)**; OX2 curves- Control Psb = 233(±16) log Psln + 73(±3); SB Psb = 173(±28)* log Psln + 162(±14)** where Psb indicates P sorbed and Psln indicates P in solution.

View larger version (21K): [in a new window]   Fig. 3. Comparison of 0.2 mL additions of complete soybean (SB) leachate (____ Control; _ __ _ CL-SB) and the acidified leachate (AL) component (...... AL-SB) on the P sorption of two Oxisols (OX1 and OX2), an Ultisol (ULT) and a Vertisol (VERT) soil after 1.5 h reaction. Significant differences in curves– OX1 curves- Control Psb = 58(±4) log Psln – 2(±5); CL SB Psb = 58(±6) log Psln – 12(±5); AL SB Psb = 60(±4) log Psln + 3(±6)*; ULT curves- Control Psb = 73(±4) log Psln – 25(±5); CL SB Psb = 79(±5) log Psln – 26(±6); AL SB Psb = 75(±3) log Psln – 38(±5)**; VERT curves- Control Psb = 225(±8) log Psln – 19(±8); CL SB Psb = 232(±12) log Psln – 9(±11); AL SB (VERT) Psb = 242(±19) log Psln – 60(±23)** where Psb indicates P sorbed and Psln indicates P in solution.