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Phosphate Sorption and Release in a Sandy-Loam Soil as Influenced by Fertilizer Sources

Dep. of Natural Resource Sciences, Macdonald Campus of McGill Univ. Ste. Anne de Bellevue, QC, Canada H9X 3V9

View larger version (22K): [in this window] [in a new window]   Fig. 1. Soil relative surface charge in manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil). Data were pooled from four replicates of the field experiment. The vertical bars represent standard error.

View larger version (19K): [in this window] [in a new window]   Fig. 2. Phosphate adsorption (adsorption of added phosphate + native adsorbed phosphate) in manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil) from phosphate solutions adjusted to (a) pH 3; (b) pH 6; and (c) pH 10. Dashed and solid lines were fitted using a Langmuir 2-surface model. Data points were from one replicate soil.

View larger version (23K): [in this window] [in a new window]   Fig. 3. The relationship between pH and phosphate concentration in the equilibrium solution from phosphate adsorption study. Manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil) are the same as in Fig. 1, and results are from one replicate soil. The added phosphate solution pH was: (a) pH 3; (b) pH 6; and (c) pH 10.

View larger version (14K): [in this window] [in a new window]   Fig. 4. Phosphate concentrations in desorption solutions collected from manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil) on 10 consecutive days. Data points are the means (n = 4) and vertical bars are standard errors of the mean.

View larger version (17K): [in this window] [in a new window]   Fig. 5. Phosphate desorption in manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil). Data points are the means of four soil replicates from field experiment and vertical bars are standard errors of the mean.

View larger version (18K): [in this window] [in a new window]   Fig. 6. Cumulative dissolved organic carbon (DOC) released from manured soil (Man.-soil) and triple superphosphate-fertilized soil (TSP-soil) during 10 desorption events. Data points are the means of four soil replicates from field experiment and vertical bars are standard errors of the mean.