Bringing the total number of essential trace elements to 15. (greenplanet.com)
«They're called essential trace elements, because without them we die,» says John Long at Flinders University in Adelaide, Australia. (newscientist.com)
Most coral soils are deficient in potassium (K) and generally lack many other essential trace elements and micronutrients to support sustainable cultivation of food plants. (llnl.gov)