Availability of phosphorus and nitrogen from modified mono-ammonium phosphate (MAP) fertiliser compounds

Title
Availability of phosphorus and nitrogen from modified mono-ammonium phosphate (MAP) fertiliser compounds
Publication Date
2024-08-08
Author(s)
Mclachlan, Jonathan W
( author )
OrcID: https://orcid.org/0000-0003-0592-4424
Email: jmclach7@une.edu.au
UNE Id une-id:jmclach7
English, Peter W
Flavel, Richard J
( author )
OrcID: https://orcid.org/0000-0001-7867-2104
Email: rflavel3@une.edu.au
UNE Id une-id:rflavel3
Guppy, Chris N
( author )
OrcID: https://orcid.org/0000-0001-7274-607X
Email: cguppy@une.edu.au
UNE Id une-id:cguppy
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
CSIRO Publishing
Place of publication
Australia
DOI
10.1071/SR24010
UNE publication id
une:1959.11/62030
Abstract

Moderating nutrient release to match plant requirements more closely can improve nutrient use efficiency. The formation of lower-solubility ammonium salts may be a simple and cost-effective way to slow the release of nitrogen (N) from fertiliser sources. Several modified mono-ammonium phosphate (MAP) fertiliser compounds were prepared by adding magnesium silicate to regular MAP fertiliser and reconstituting the granules. This process results in the formation of schertelite that may potentially slow the release of both N and phosphate to soil solution. These modified MAP fertiliser compounds include more citrate-soluble N and phosphorus (P) than standard MAP fertiliser. The fertiliser compounds were added to a P-responsive soil and barley plants were grown for 5 weeks to investigate shoot yield responses to nutrient availability of the modified MAP fertiliser compounds. Reverse dilution tracing techniques were also used to compare the fertiliser solubility and P availability of the modified MAP fertiliser compounds with regular MAP fertiliser. Barley (Hordeum vulgare ) plants recovered P equally and efficiently over 5 weeks of growth in the P-responsive soil, suggesting that the fertiliser compounds were sufficiently soluble to meet plant requirements and that phosphate release was not slowed by the formation of schertelite. However, shoot yields were generally lower when the barley plants were grown with the modified MAP fertiliser compounds compared to standard MAP fertiliser. This reduced growth was likely due to decreased N availability through a slower release of N, thus further research is warranted to determine the potential for these products to improve N use efficiency.

Link
Citation
Soil Research, 62(5), p. 1-6
ISSN
1838-6768
1838-675X
Start page
1
End page
6
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International

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