Nutrient 6 : Mineral elements including nitrogen, phosphorous, potassium, calcium, sulfur, magnesium, and iron which encourage plant and animal growth in soil or natural bodies of water. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}