agronomy Argentina 6 bioassay 6 Chubut 4 Fungi 4 Glauconitic sandstones 4 Potassium alternative sources 4 Potassium fertilizer 4 Salamanca Formation 4 feldspar 4 fertilizer application 4 fungus 4 glauconite 4 grass 4 irrigation 4 leaching 4 native species 4 potassium 4 sandstone 4 soil microorganism 4 soil remediation 4 colonization 3 "Alpeorujo" 2 Agricultural runoff 2 Alpeorujo 2 Aneusomaty 2 Arbuscular 2 Arbuscular mycorrhiza 2 Bioremediation 2 Biosphere reserve 2