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| Home > Publications database > Simulation of soil phosphorus dynamics and crop yield for organic and mineral fertilization treatments at two long-term field sites |
| Journal Article | FZJ-2024-06327 |
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2024
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.scitotenv.2024.177517 doi:10.34734/FZJ-2024-06327
Abstract: The efficacy of phosphorus (P) based fertilizers is frequently compromised by soil dynamics that render much ofthe applied P unavailable for crops. This study aimed to: (i) validate a new P model's prediction of plant-availableP; (ii) analyze the effects of organic versus mineral fertilization on P availability and crop yield; and (iii) examinetemporal changes in P pools under various fertilization regimes. Data were collected from two long-term fieldtrials, Dikopshof and Bad Lauchst¨adt, in Germany, using organic (FYM), mineral (MIN), a combination of organicand mineral (MIX) fertilizers, and unfertilized treatments. The AgroC model, incorporating a new P module,accurately predicted P dynamics in cropped plots. At both sites, MIX presented the highest yield, P removal, totalP and available soil P. After 120 years of repeated P fertilization, simulations at Dikopshof revealed a positive Pbalance in MIN (11.1 % with observed 13 %) and in MIX (15 % with observed 15 %), but negative in FYM (- 4.9% with observed - 5 %). However, at Bad Lauchst¨adt, the P balance was negative in all treatments except in MIN(+1.04 %), indicating P depletion. Among crops, cereals showed the most variated yields, with P-use efficiencyranging from 50 % to 99 %, while sugar beet presented the highest P-use efficiency (up to 122 %). The lowest Papplication rates exhibited, FYM treatment, the highest P-use efficiency for all crops. Model pools were successfullylinked to field-measured soil P fractions using CAL and DGT methods, providing initial predictions ofvarious soil P fractions across different fertilization strategies.
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