Environment: The disappearing nutrient

By N. Gilbert. Nature, 2009

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Sustainability Challenges of Phosphorus and Food: Solutions from Closing the Human Phosphorus Cycle (2011, background): “Estimates suggest that the global livestock population is about 65 billion animals, but only about 50% of P consumed by livestock is returned as animal wastes to fields where food is grown (figure 1b; Smil 2000, Gilbert 2009).”
Luxury uptake of phosphorus by microalgae in waste stabilisation ponds: current understanding and future direction (2014, background): “At the same time global phosphorus supply could be exhausted in as little as 50 years (Gilbert 2009).”
The role of complementarity and selection effects in P acquisition of intercropping systems (2017, background): “However, global P reserves are expected to be exhausted by increased food needs in the future (Gilbert 2009), and therefore it is important to better exploit soil P resources, for example by rhizosphere management strategies to optimize P bioavailability in agro-ecosystems (Lambers et al.”
Contribution of interspecific interactions and phosphorus application to sustainable and productive intercropping systems (2013, background): “oncentrations ranging from 15 to 20 mg kg−1 in 2007 from a value f < 10 mg kg−1 in 1980 according to Li et al. (2011a). It is therefore important to increase P use efficiency through ptimizing fertilizer P application for the current growing season nd to devise ways of better utilizing the P that ha”