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http://www.fao.org/ag/ca/AfricaTrainingManualCD/PDF%20Files/06CROP1.PDF

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http://csanad.hubpages.com/hub/GMO-advantages-and-disadvantages   

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http://www.agriinfo.in/?page=topic&superid=1&topicid=668

4. Nuffield Council of Bioethics(2008). Possible benefits of GM Crops in developing countries. Retrieved August 19 2013 

http://www.nuffieldbioethics.org/gm-crops-developing-countries/gm-crops-developing-countries-possible-benefits-gm-crops-developing-co

5. TutorVista(2009). Salient Features of Mixed Cropping. Retrieved August 19 2013 http://www.tutorvista.com/content/science/science-i/improvement-food-resources/mixed-cropping.php

6.  University of Michigan(2010). GM Crops: Costs and Benefits. Retrieved August 19 2013

http://sitemaker.umich.edu/sec006group5/introduction

7. jrscience.wcp.muohio.edu (1998, November 12). Final: The Effect of Different Types of Water on the Growth of Bean Plants(Olivia 2). Retrieved July 18 2013 
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http://www.nuffieldfoundation.org/practical-biology/investigating-effect-minerals-plant-growth