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Fertile Minds
A program by PotashCorp to address misconceptions about fertilizers and the role of the fertilizer industry. Detailed description of fertilzer use and production. Many downloads and a quiz.
http://www.fertile-minds.org/
International Fertilizer Industry Association
Describes the production, distribution and consumption of fertilizers, their intermediates and raw materials
http://www.fertilizer.org/
Kieserite
Magnesium/sulphur deficiency symptoms are widespread due to inappropriate nutrient management. This website offers not only details about the origin, properties and production of Kieserite, but also a wide range of information concerning its importance and possibilities of use in agriculture.
http://www.kieserite.com/
The International Fertiliser Society
Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers.
http://www.fertiliser-society.org/