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Lookup NU author(s): Professor David ManningORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
In many developing countries, replacement of the nutrients needed to produce subsistence and cash crops is a major challenge, because of cost and long/complex supply chains. Nutrient audits show that major nutrients are being removed from soils faster than they are being replenished, which is clearly unsustainable. The use of crushed silicate rocks as a source of plant nutrients predates the use of the chemical fertilizers that have revolutionised global agriculture. Such highly soluble fertilizers are not ideal for the deeply leached oxisols widespread in the global south, and are rapidly leached. In these soils, silica may also need to be added as nutrient. In these circumstances, crushed silicate rocks have great potential to maintain soil health and to support crop production. In Brazil crushed rock remineralizers have been developed, and Brazilian federal law allows these to be used for crop nutrition, with specifications clearly defined by appropriate regulation. This approach provides a model that enables developing countries elsewhere to exploit local geological sources, and reducing dependency on imported chemical fertilizers. It creates opportunities for employment producing crushed rock products for different crops and locally variable soils and conditions, and illustrates renewed academic and practical interest in so-called ‘Development Minerals.’
Author(s): Manning DAC, Theodoro SH
Publication type: Article
Publication status: Published
Journal: The Extractive Industries and Society
Year: 2020
Volume: 7
Issue: 2
Pages: 480-487
Print publication date: 01/04/2020
Online publication date: 29/11/2018
Acceptance date: 12/11/2018
Date deposited: 30/11/2018
ISSN (print): 2214-790X
ISSN (electronic): 2214-7918
Publisher: Elsevier
URL: https://doi.org/10.1016/j.exis.2018.11.002
DOI: 10.1016/j.exis.2018.11.002
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