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Nutrient interactions and salinity effects on plant uptake of phosphorus from waste-based fertilisers

Gomez-Munos, Beatrice; Müller-Stöver, Dorette; Hansen, Veronika; Jensen, Lars Stoumann and Magid, Jakob (2022) Nutrient interactions and salinity effects on plant uptake of phosphorus from waste-based fertilisers. Geoderma, 422 (115939), pp. 1-10.

[thumbnail of Nutrient interactions and salinity effects Geoderma 2022.pdf] PDF - Published Version - English
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Document available online at: https://www.sciencedirect.com/science/article/pii/S0016706122002464


Many organically managed farms in Europe have low levels of soil phosphorus (P). Arable farms that rely strongly on biological nitrogen fixation (BNF) have been shown to have rather low outputs and a tendency to deplete soil P and potassium (K) compared with arable farms that have a lower reliance on BNF and higher external inputs. Therefore, research focusing on providing a balanced input of nitrogen (N), P, K and sulphur (S) from alternative sources is of interest to organically managed farms in Europe.
The aim of this study was to quantify P availability from different organic wastes applied alone or in combination to improve the mixtures’ N:P:K:S ratio. P availability was measured by P uptake and recovery in ryegrass grown in pots. The isotope dilution approach was used33 in which a non-labelled fertiliser is added to a soil that has been pre-incubated and equilibrated with labelled P.
The P recovery of the different organic wastes varied significantly (10–20 %). Manure and anaerobically digested manure mixed with ash from straw had the lowest P recovery. All the organic waste treatments had higher plant growth and P uptake compared with the negative control, but none of them reached the values observed after application of mineral P. Mixing digested manure with ash increased soil pH at the end of the experiment, which may explain the lower P availability. The highest P recovery was found in digested products, either manure alone or mixed with municipal waste or the industrial waste product Fertigro®. However, the mixture of digested manure and Fertigro® led to lower dry matter production, whereas Fertigro® used alone resulted in high leaf P concentrations but depressed shoot and root growth, presumably due to salinity effects and a decrease in soil pH. Anaerobic digestion increased the availability of P, which may be explained by the lower immobilisation potential of the remaining organic matter in the digestate.
This study highlights the potential challenges when attempting to improve the N:P:K:S ratios of waste-based fertilisers through mixing due to material interactions. However, such effects are likely to be overexpressed in pot trials that have a limited soil volume. Field trials are therefore needed to quantify such effects in practice.

EPrint Type:Journal paper
Keywords:waste reduction, fertilizer formulations, phosphate fertilizers, RELACS
Agrovoc keywords:
waste minimization -> waste reduction
fertilizer formulations
phosphorus fertilizers -> phosphate fertilizers
Subjects: Soil > Nutrient turnover
Values, standards and certification > Evaluation of inputs
Research affiliation: European Union > Horizon 2020 > RELACS
Denmark > Organic RDD 3 > NutHY
Horizon Europe or H2020 Grant Agreement Number:773431
Related Links:https://relacs-project.eu/
Deposited By: Magid, Assoc. Prof. Jakob
ID Code:44113
Deposited On:13 Jun 2022 09:32
Last Modified:13 Jun 2022 09:32
Document Language:English
Refereed:Peer-reviewed and accepted

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