Table 2 Uranium accumulation rates and U inputs at Sámstaðir and Geitasandur long-term experiment sites
From: Critical accumulation of fertilizer-derived uranium in Icelandic grassland Andosol
Soil depth | Sámstaðir | Geitasandur | ||
|---|---|---|---|---|
39P (e) | 39P (a1) | 80P (a2) | 80P (d2) | |
0–5 cm | ||||
Annual accumulation rate (µg kg−1 year−1) | 113 | 149 | 319 | 301 |
U input (g ha−1year−1) | 19 | 19 | 30.3 | 33.2 |
U in applied P fertilizers (mg U kg−1 P) | 489 | 482 | 545 | 492 |
5–10 cm | ||||
Annual accumulation rate (µg kg−1 year−1) | 16 | 27 | 37 | 45 |
U input (g ha−1year−1) | 4 | 12 | 15 | 20 |
0–10 cm | ||||
Annual accumulation rate (µg kg−1 year−1) | 58 | 52 | 87 | 94 |
U input (g ha−1year−1) | 23 | 31 | 45 | 53 |
U in applied P fertilizers (mg U kg−1 P) | 580 | 794 | 811 | 782 |