Bio-based fertilisers can replace conventional inorganic P fertilisers under European pedoclimatic conditions
Why this work is in the frame
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Bibliographic record
Abstract
Mineable phosphorus (P) resources are finite and unevenly distributed globally. Recycling of P from different waste streams as bio-based fertilisers (BBFs) provides a viable option for closing nutrient cycles. To implement this approach effectively, it is necessary to evaluate the P fertiliser efficiency of BBFs under field conditions using a mechanistic approach that links their performance to their chemical composition. This study aimed to test to which extent BBFs can replace conventional inorganic P fertilisers under different pedoclimatic conditions. To this end, the same eight BBFs were tested in field experiments over two consecutive years at five different sites in Europe growing cereals and sunflower. Furthermore, the residual effect of the BBFs in a succeeding crop was investigated. We found that none of the tested P-BBFs resulted in significantly lower yield or total P uptake than triple superphosphate. Ammonium magnesium phosphate (struvite), dicalcium phosphate and phytate-based fertilisers performed best across all field experiments (mean mineral replacement values of 80 – 125 %). No consistent effect of soil or climatic conditions was found. Only marginal residual effects were observed, suggesting that longer trials with repeated applications are necessary to quantify residual effects. The fact that two out of five trial sites were not responsive to P fertilisation highlights the need to consider soil P status for the successful implementation of P fertiliser field trials as well as for fertilising recommendations. In conclusion, most tested BBFs have the potential to replace conventional inorganic P fertilisers across a range of European soils and climate. • 8 P bio-based fertilisers (BBFs) tested in field trials in five European countries. • Similar yield & total P uptake obtained with BBFs compared to inorganic fertiliser. • BBFs reached mean mineral replacement values between 43 % and 125 %. • The ranking of BBFs between countries and years was not consistent. • Struvite, dicalcium-P and phytate-based BBFs performed best across sites and years.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.011 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it