TY  - JOUR
AU  - Sun, Yajie
AU  - Wu, Bei
AU  - Amelung, W.
AU  - Christensen, B. T.
AU  - Pätzold, S.
AU  - Bauke, S. L.
AU  - Schweitzer, K.
AU  - Baumecker, M.
AU  - Bol, R.
TI  - Non-critical uranium accumulation in soils of German and Danish long-term fertilizer experiments
JO  - Geoderma
VL  - 370
SN  - 0016-7061
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2020-03192
SP  - 114336 -
PY  - 2020
AB  - Phosphorus (P) fertilizers vary considerably in contents of uranium (U), thus raising concerns regarding U accumulation in agricultural soils. We examined U concentrations in soil from three long-term field experiments with different P fertilizer applications: Rengen (P fertilizer from basic slag, grassland, Germany), Thyrow (P fertilizer from igneous phosphate rocks, arable land, Germany) and Askov (P fertilizer from igneous phosphate rocks, arable land, Denmark). Accumulation rates were low for Rengen (1.3 µg U kg−1 yr−1) and Thyrow (0.6 µg U kg−1 yr−1) in P-treated plots compared with plots without P fertilization. These accumulation rates were ten times lower than those previously reported (mean 17 µg U kg−1 yr−1). Intriguingly, concentrations of acid-extractable U in the Askov topsoil increased from 1923 to 2016, regardless of whether P was added (5.1 µg kg−1 yr−1) or not (4.7 µg kg−1 yr−1). This suggests that at least part of the accumulated U originated from other sources than P fertilizers. Total U concentrations were significantly larger in the period 1985–2016 than in the period 1938–1976 in Askov soil treated with NPK but not in soils without P fertilization. Hence, long-term P fertilizer application did increase the soil U concentrations at Askov, although at a low level.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000528270900011
DO  - DOI:10.1016/j.geoderma.2020.114336
UR  - https://juser.fz-juelich.de/record/884306
ER  -