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Water soluble phosphate fertilizers for crops grown in calcareous soils - an outdated paradigm for recycled phosphorus fertilizers

Meyer, G.; Frossard, E.; Mäder, P.; Nanzer, S.; Randall, D.G.; Udert, K.M. and Oberson, A. (2018) Water soluble phosphate fertilizers for crops grown in calcareous soils - an outdated paradigm for recycled phosphorus fertilizers. Plant and Soil, 424 (1-2), pp. 367-388.

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Document available online at: https://link.springer.com/article/10.1007/s11104-017-3545-x


Summary

Background and aims
The current paradigm for phosphorus (P) fertilizers applied to calcareous soil is that almost entirely water soluble P fertilizers are efficient and sparingly soluble P fertilizers are not efficient P sources for crops. We hypothesize that this paradigm does not apply to recycled P fertilizers and that other P pools can explain the plant use of recycled P fertilizers on calcareous soil.
Methods
We applied 33P isotopic dilution method to evaluate recycled P fertilizers based on plant P uptake from fertilizer relative to plant uptake from a water soluble P reference fertilizer. The predictability of fertilizer effectiveness based on sequentially extracted P forms and X-ray diffraction pattern of recycled fertilizers derived from sewage sludge, human urine and organic waste was evaluated.
Results
The plant experiments showed that tested recycled P fertilizers including compost were more effective than rock phosphate. The water insoluble P contained in urine based products was almost as effective as a fully water soluble P fertilizer. The tested recycled P fertilizers are characterized by complex P compounds differing in solubility which were so far not considered in the water and citric acid extraction methods. The fraction of resin- and NaHCO3 extractable fertilizer P explained effectiveness of P fertilizer applied to the calcareous and to an acidic soil.
Conclusion
We concluded that water solubility is not required when P forms in recycled products are comparable to reactions products of rock phosphate based fertilizers in soil. Alternatives to fully water soluble P fertilizers are available to supply P to crops grown on calcareous soil efficiently.


EPrint Type:Journal paper
Keywords:Phosphorus, Calcareous soil, Isotopic dilution, Recycled fertilizer, Sequential fractionation, Fertilizer effectiveness, IMPROVE-P, CoreOrganic2, FiBL1007601
Subjects: Crop husbandry > Composting and manuring
Soil > Nutrient turnover
Research affiliation: European Union > CORE Organic II > IMPROVE-P
Switzerland > ETHZ - Agrarwissenschaften
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil
Switzerland > Other organizations
H2020 or FP7 Grant Agreement Number:249667
ISSN:0032-079X
DOI:10.1007/s11104-017-3545-x
Related Links:http://coreorganic2.org/coreorganic2.asp, https://www.fibl.org/en/projectdatabase/projectitem/project/625.html
Deposited By: Möller, PD Dr. Kurt
ID Code:32919
Deposited On:15 Jun 2018 08:19
Last Modified:19 May 2021 11:28
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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