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Changes in uranium and thorium contents in topsoil after long‐term phosphorus fertilizer application
Author(s) -
Wetterlind J.,
Richer De Forges A. C.,
Nicoullaud B.,
Arrouays D.
Publication year - 2012
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.2011.00376.x
Subject(s) - topsoil , fertilizer , zoology , phosphorus , thorium , field experiment , agronomy , chemistry , uranium , soil water , environmental science , soil science , biology , metallurgy , materials science , organic chemistry
Archived soil samples from the beginning and end of three long‐term field trials conducted in central France were analysed for total uranium (U) and thorium (Th) contents to evaluate the effect of 15–30 yr of phosphorus (P) fertilizer treatments on the accumulation of these elements in the topsoil. For comparison, the soil samples were also analysed for total P. Three treatments were compared: no P application (P 0 ), 26 kg P/ha/yr (P 26 ) and 52 kg P/ha/yr (P 52 ). Significant effects of P fertilizer were observed on U content and, to a lesser extent, on Th content as a result of the P 52 treatment at two of the field trials. This effect was demonstrated both in the analyses at the end of the field trials [P 52 –P 0 : +0.25 and +0.44 mg U/kg soil, +0.58 (not significant) and +1.03 mg Th/kg soil] and when considering the changes in U and Th contents between the beginning and the end of the field trials (end–start: +0.18 and +034 mg U/kg soil, +0.35 and +0.45 mg Th/kg soil). The P fertilizer effect was also supported by the correlations of U and Th with total levels of P in the soil. However, in one of the three trials, no significant accumulation of U or Th because of fertilizer could be seen, suggesting either that less U and Th were applied using a different P fertilizer and/or that soil heterogeneity masked significant effects.