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en.wikipedia.org/wiki/Fertilizer

A fertilizer (American English) or fertiliser is any material of natural or synthetic origin (other ..... of their farms. The modern science of plant nutrition started in the 19th century and the work of German chemist Justus von Liebig, among others.

www.sciencedaily.com/terms/fertilizer.htm

Scientists say thermally conditioned sewage sludge serves as an excellent fertilizer to improve soil properties. The major advantage over commercial ... read  ...

www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/chemical/fertilisersrev1.shtml

A secondary school revision resource for OCR Gateway GCSE Additional Science about chemical economics, fertilisers and crop yield.

www.sciencemag.org/news/2013/07/researchers-discover-first-use-fertilizer

Jul 15, 2013 ... Fertilizer provides plants with all sorts of nutrients that they need to ... in the Proceedings of the National Academy of Sciences, the nitrogen-15 ...

home.howstuffworks.com/question181.htm

Carbon, hydrogen and oxygen - Available from air and water and therefore in plentiful supply; Nitrogen, phosphorus, potassium (a.k.a. potash) - The three ...

www.scientificamerican.com/article/how-fertilizers-harm-earth

Dear EarthTalk: What effects do fertilizers, pesticides and herbicides used on residential lawns or on farms have on nearby water bodies like rivers, streams— or ...

www.scientificamerican.com/article/fertilizer-runoff-overwhelms-streams

Mar 14, 2008 ... And scientists warn that a federal mandate to produce more biofuel may ... losing their ability to filter excess nitrates from fertilizers and sewage.

www.sciencelearn.org.nz/videos/513-fertilisers

Jul 30, 2013 ... Dr Ross Monaghan from AgResearch at Invermay in Otago talks about fertilisers – what they are and why they are used on farms. Point of ...

www.sciencebuddies.org/science-fair-projects/project_ideas/EnvSci_p025.shtml

Many people routinely use fertilizer for crops, gardens, and lawns. ... <http://www. sciencebuddies.org/science-fair-projects/project_ideas/EnvSci_p025.shtml> ...

www.sciencelearn.org.nz/resources/964-fertiliser

Jul 30, 2013 ... Fertilisers are chemicals that are added to soil to supply nutrients to make it more fertile. The chemicals in fertilisers contain essential elements ...