Analysis of information sources in references of the Wikipedia article "Gran Chaco" in English language version.
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alluvial sandy soils have P (phosphorus) levels of up to 200–300 ppm
{{cite news}}: CS1 maint: deprecated archival service (link)The Gran Chaco was one of the last frontiers in South America – but agricultural development, largely driven by soy, is gathering pace.
{{cite news}}: CS1 maint: deprecated archival service (link)alluvial sandy soils have P (phosphorus) levels of up to 200–300 ppm