Iron Chlorosis - Explains how to detect and combat iron deficiency in plants. Fertiliser Manufacturers Research Association - Aims to promote and encourage responsible fertilizer use. Contains many fertilizer fact sheets. Soil Fertility - Answers questions related to the enhancement and maintenance of soil fertility. The International Fertiliser Society - Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers. International Fertilizer Industry Association - Describes the production, distribution and consumption of fertilizers, their intermediates and raw materials International Fertilizer Development Center - Production and agronomic effectiveness of fertilizers. Potentially Beneficial Effects from Liming - Abstract from a university lecture describing the physical and chemical effects of liming on different soil types. Fertilizer and Lime Research Center, New Zealand - Agricultural use and the environmental impact of fertilizer, lime and soil amendments. Manures and Fertilizers - Indian Agricultural Resources. Information about manures, organic, inorganic and biofertilizers. Effects of Organic and Inorganic Fertilizers on Soil Fertility and Crop Quality - Describes the results of a long-term field experiment in Sweden. By Artur Granstedt and Lars Kjellenberg. Soil Quality Institute (SQI) - Research findings and practical technologies that help conserve and improve soil conditions. Applicable to farming, ranching, forestry and gardening. 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. Soil Fertility and Crop Nutrition - The Ontario Ministry of Agriculture, Food and Rural Affairs offers a large collection of newsletters and factsheets with topics ranging from soil sampling to fertilizer requirements and micronutrients. Recommended Soil Testing Procedures - Describes important soil tests and explains how to perform and interpret them. Soils, Cropping Practices and Fertilizer Use - Describes the fertilizer requirements of different soil types, with particular reference to Alberta. Fertilizer Application and Placement - Provides general guidance on the purchase, use and timing of nitrogenous fertilizers and on the application of phosphorus, potassium and sulphur. What is Soil Fertility? - Information about soil fertility and how it can be improved. Soil Health and Fertility - Provides a number of downloadable publications on various aspects of soil management, provided by the NSW Department of Primary Industries. Smart! Fertilizer Management Software - Fertilizer calculator and fertilizer management tool, providing guidance on fertilizer recipes, cost analysis and fertilizer mixes. Soil, Water and Agricultural Testing Laboratory - Self supporting lab at New Mexico State University providing chemical testing for plants and soils. Soil Fertility - Application recommendations for different fertilizers. Nutrients for Life Foundation - Organization aiming to provide science-based information to help educate people about the benefits of fertilizer. Includes information for consumers, students, teachers and grassroot activists. Soil Fertility - A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies. Soil test interpretations - Gives examples of soil test values and explains their significance.