Site | Treatment | Depth (cm) | Ca-associated P | Al-associated P | Fe-associated P | Organic-associated P | R-factor | |||
---|---|---|---|---|---|---|---|---|---|---|
ACP | Hydroxyapatite | CaHPO4 × 2H2O | AlPO4 | P sorbed on gibbsite | P sorbed on goethite | Phytic acid | ||||
Dahlem | Control | 0–30 | 19 ± 1 | 4 ± 4 | 68 ± 2 | 7 ± 1 | 0.003103 | |||
30–50 | 2 ± 2 | 36 ± 0 | 58 ± 1 | 4 ± 2 | 0.010016 | |||||
70–90 | 40 | 23 | 36 | 0.006228 | ||||||
Mineral + organic P | 0–30 | 11 ± 9 | 7 ± 10 | 24 ± 6 | 26 ± 10 | 25 ± 19 | 8 ± 6 | 0.003642 | ||
30–50 | 6 ± 6 | 5 ± 5 | 27 ± 1 | 52 ± 1 | 10 ± 0 | 0.003893 | ||||
70–90 | 34 ± 3 | 4 ± 6 | 13 ± 1 | 44 ± 0 | 3 ± 4 | 0.003781 | ||||
Freising Dürnast | Control | 0–30 | 20 | 15 | 44 | 21 | 0.002441 | |||
30–60 | 7 | 0 | 12 | 57 | 24 | 0.004938 | ||||
60–90 | 11 | 21 | 49 | 19 | 0.003804 | |||||
Mineral + organic P | 0–30 | 21 | 9 | 52 | 19 | 0.002279 | ||||
30–60 | 8 | 15 | 55 | 27 | 0.003750 | |||||
60–90 | 11 | 73 | 15 | 0.003848 | ||||||
Bad Lauchstädt | Control | 0–30 | 27 | 47 | 26 | 0.003704 | ||||
30–60 | 52 | 21 | 27 | 0.004682 | ||||||
60–90 | 56 | 27 | 17 | 0.005963 | ||||||
Mineral + organic P | 0–30 | 49 | 31 | 19 | 0.002447 | |||||
30–60 | 43 | 13 | 20 | 25 | 0.003174 | |||||
60–90 | 47 | 26 | 27 | 0.005464 |