By Matt Olson
Rice farmers depend on phosphorous fertilizers to maximize their yields of this major staple food, which helps nourish more than half of the world's population. However, there is a finite supply of the nutrient available to be mined.
Dr. Joerg Schaller and colleagues discovered that silicon, which is also known to play a key role in growing rice, can replace phosphorus in soil and mobilize it to be available for absorption by the plants that need it. Phosphorus binds to iron in soil, rendering it unavailable to plants.
"If all the building places are occupied with silicon, there is no space for phosphate to bind (in the soil). It means you need only half of the fertilizer," said Schaller, who is with the Leibniz Centre for Agricultural Landscape Research (ZALF).