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Ammonium Adsorption and Desorption in Sandy Soils

^a Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK Canada S7N 5A8
^b USDA-ARS-PWA, 24106 N. Bunn Rd., Prosser, WA 99350 USA

View larger version (10K): [in a new window]   Fig. 1 The ideal quantity–intensity plot for NH4, where NH4 = the amount of NH4 adsorbed or released from the soil; ARNH4 = activity ratio, i.e. (NH4)/(Ca+Mg)1/2 in solution; ARoNH4 = equilibrium activity ratio; PBC = linear potential buffering capacity for NH4; -NHo4 = labile NH4, and NH4-sas = specific adsorption sites

View larger version (18K): [in a new window]   Fig. 2 Quantity–intensity plots for (A) surface and subsurface soils of the Wabasso and Candler sands and (B) the 90- to 100-cm depth horizon of the Wabasso sand. NH4 is the amount of NH4 adsorbed or released from the soil and ARNH4 is the activity ratio, i.e., (NH4)/(Ca+Mg)1/2 in solution

View larger version (13K): [in a new window]   Fig. 3 The relationship between organic C and (A) potential buffering capacity and (B) labile NH4 for the soils. The circles represent the data used in the regression for the surface and subsurface soils of the Candler and Wabasso sand. The triangles represent the Wabasso 90- to 100-cm depth horizon and were not used in the regression analysis

View larger version (14K): [in a new window]   Fig. 4 The relationship between exchangeable and labile NH4 for the Candler and Wabasso soils