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    Rights: University of Waikato
    Published 30 July 2013 Referencing Hub media
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    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.

    ACKNOWLEDGEMENTS
    Professor Louis Schipper, University of Waikato
    David Higgitt http://creativecommons.org/licenses/by-sa/2.0/deed.en
    Deeporaj http://creativecommons.org/licenses/by-sa/3.0/deed.en
    Jan Ulrich http://creativecommons.org/licenses/by-sa/3.0/deed.en
    Mark Silcock,  McDonald’s Lime
    ​Certain photos in this video are the copyrighted property of 123RF Limited, their contributors or licensed partners and are being used with permission under licence. These images and/or photos may not be copied or downloaded without permission from 123RF Limited.