To make sure that you get good crop yields or grass yields, you need to make sure that you’ve got enough nitrogen for them to be able to build their proteins and the enzymes that they need. So without a good supply of nitrogen, it is hard to get large yields or grow the amount of food that you need. It is estimated that about 40% of the world’s population is fed by food that is grown using nitrogen that has been brought in either as fertiliser or through the deliberate cultivation of plant crops that are able to fix nitrogen out of the atmosphere.
Professor Louis Schipper, University of Waikato
David Higgitt http://creativecommons.org/licenses/by-sa/2.0/deed.en
Jan Ulrich http://creativecommons.org/licenses/by-sa/3.0/deed.en
Mark Silcock, McDonald’s Lime
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