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Article
2024
Limitations of soil-applied non-microbial and microbial biostimulants in enhancing soil P turnover and recycled P fertilizer utilization: A study with and without plants
Limitations of soil-applied non-microbial and microbial biostimulants in enhancing soil P turnover and recycled P fertilizer utilization: A study with and without plants
Abstract (English)
Introduction: Phosphorus recovery from waste streams is a global concern due to
open nutrient cycles. However, the reliability and efficiency of recycled P fertilizers
are often low. Biostimulants (BS), as a potential enhancer of P availability in soil,
could help to overcome current barriers using recycled P fertilizers. For this, a
deeper understanding of the influence of BSs on soil P turnover and the interaction
of BSs with plants is needed.
Methods: We conducted an incubation and a pot trial with maize in which we
testednon-microbial (humic acids and plant extracts) and microbial BSs
(microbial consortia) in combination with two recycled fertilizers for their
impact on soil P turnover, plant available P, and plant growth.
Results and discussion: BSs could not stimulate P turnover processes (phosphatase
activity, microbial biomass P) and had a minor impact on calcium acetate-lactate
extractable P (CAL-P) in the incubation trial. Even though stimulation of microbial P
turnover by the microbial consortium and humic acids in combination with the
sewage sludge ash could be identified in the plant trial with maize, this was not
reflected in the plant performance and soil P turnover processes. Concerning the
recycled P fertilizers, the CAL-P content in soil was not a reliable predictor of plant
performance with both products resulting in competitive plant growth and P uptake.
While this study questions the reliability of BSs, it also highlights the necessity
toimprove our understanding and distinguish the mechanisms of P mobilization in
soil and the stimulation of plant P acquisition to optimize future usage.
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Published in
Frontiers in plant science; Vol. 15, (2024) 1465537.
https://doi.org/10.3389/fpls.2024.1465537.
ISSN: 1664-462X
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630 Agriculture