| Chloride Crop Nutrition: Essential nutrient for plant growth. Testing for deficiencies and effects on plant growth. Effect on plant diseases. |
| 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. |
| Efficient Fertilizer Use Manual: Comprehensive online book about proper fertilizer uses, soil pH and soil sampling. |
| European Fertilizer Manufacturers Association: Contains details about plant nutrient requirements, recommendations for fertilizer use and best agricultural practices for fertilizer application. |
| European Network for Field Vegetable Crops: Environmental problems associated with the nitrogen fertilization of field grown vegetables. |
| 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. |
| Fertiliser Deficiencies: Papers describing deficiency symptom in crops and field vegetables. |
| Fertiliser Manufacturers Research Association: Aims to promote and encourage responsible fertilizer use. Contains many fertilizer fact sheets. |
| Fertilizer and Lime Research Center, New Zealand: Agricultural use and the environmental impact of fertilizer, lime and soil amendments. |
| Fertilizer Industry Federation of Australia: Provides publications and educational material. |
| Fertilizers, Soil fertility, Plant Nutrition: Information on all aspects of soil fertility and fertilizers. |
| Field Museum: Educational site for students and teachers about soil and soil biology. |
| Foliar Fertilizer: Introduction to the sources of, and the uses of foliar fertilizer. |
| Food and Fertilizer Technology Centre: Technical information and practical experiences about agricultural food production and the use of fertilizers. |
| Getting Back to Basics: Crop information for all US regions and information on soil fertility and fertilizer application. |
| How to Apply Fertilizer to Wheat: Application time, forms of fertilizer and methods of application to be considered when applying fertilizer to wheat. |
| International Fertilizer Development Center: Production and agronomic effectiveness of fertilizers. |
| International Fertilizer Industry Association: Describes the production, distribution and consumption of fertilizers, their intermediates and raw materials |
| Introduction to Soils: Lectures about soil surveys, soil texture, soil acidity and soil fertility. Information about liming, fertilization and soil testing with particular reference to forestry. |
| Introductory Soil Science: Lectures and Laboratory Units of the Soil Sciences Courses at the University of Minnesota. Influences on soil fertility are explained and simple soil tests are described. |
| Iron Chlorosis: Explains how to detect and combat iron deficiency in plants. |
| 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. |
| Manures and Fertilizers: Indian Agricultural Resources. Information about manures, organic, inorganic and biofertilizers. |
| Micronutrient Disorders, HYG-1252-98: On the deficiencies that may occur in soilless floriculture, and how these can be remedied. |
| NPK Plant Nutrient Models: Online programs that simulate the response of crops to fertilization, crop residue incorporation and consider the effects of time, soil type, cultural practice and weather. Downloads available for researchers. |
| Phosphorus and potassium: Describes the phosphorus (P)and potassium (K) soil testing and fertilizer recommendation system in Ontario, Canada. |
| Phosphorus fertilizers: Describes the effective use of this fertilizer. Soil availability, fertilizer characteristics and application. |
| Plant Nutrition and Soil Fertility Laboratory: Institute of the University in Denmark. Features publications and research reports. |
| Potassium In Agriculture: The influence of potassium on plant nutrition and soil. |
| Potentially beneficial effects from liming: A university lecture describing the physical and chemical effects of liming on different soil types. |
| Preplant Soil Nitrate Tests: Description of tests that allow farmers to adjust nitrogen applications to meet the needs of each specific field. |
| Recommended soil testing procedures: Describes important soil tests and explains how to perform and interpret them. |
| Secondary and Micronutrients for Vegetables and Field Plants: A series of reports describing the effects of various micronutrients on the growth and health of plants. Pictures of plants with deficiency symptoms. |
| Soil Fertility: Answers questions related to the enhancement and maintenance of soil fertility. |
| Soil Fertility: Application recommendations for different fertilizers. |
| Soil Fertility: A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies. |
| 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 requierements and micronutrients. |
| Soil Fertility Establishment: Soil fertility management for forage crops. A introduction from the Penn State University's Agronomy Department. |
| Soil Fertility for Forage Crops: Gives detailed description of the soil and fertilizer requirements of forage crops during establishment and maintenance. University of Pennsylvania. |
| Soil Fertility Guide: Common fertilizers and their characteristics. |
| Soil Fertility Guide: Soil fertility practices in Manitoba and general fertilizer use considerations. Details about fertilizers, their characteristics, application rates and usage recommendations. N-fixation, Manure and soil factors are also described. |
| Soil Fertility Implications When Converting to Direct Seeding: Describes the different fertilization requirements for direct seeding. |
| Soil Fertility Management: Frequently asked questions about soil fertility, the application of animal wastes, organic and chemical fertilizers. Also features an online discussion forum. |
| Soil Fertility Research: Information about university research with extensive list of publications. |
| Soil Fertilizers: Information with regard to soil pH, fertilizers and lime application. |
| Soil Quality Institute (SQI): Research findings and practical technologies that help conserve and improve soil conditions. Applicable to farming, ranching, forestry and gardening. |
| Soil test interpretations: Gives examples of soil test values and explains their significance. |
| Soils: This site from the Manitoba Agriculture, Food and Rural Initiatives offers advice and information about the management and fertility of soil. Includes erosion, salinity and soil surveys. |
| Soils and Soil Management: Offers a database and search function of a range of articles about fertilizers, micronutrients and fertilizer application. |
| Sugar Cane Production and Soil Fertility.: Information on the relationship between the quality of sugarcane and soil fertility. |
| Technical Information: A number of bulletins describing soil analysis, soil types and fertiliser application. |
| The acidity of forest soils: A student paper describing soil conditions in forests. Particularly what causes the pH to change and what influences this will have on the ecosystem. |
| The International Fertiliser Society: Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers. |
| Understand your soil test: Sulfur: Background information on the role of sulphur in soil fertility, sulphur containing fertilizers and explanation of the results of a soil test. |
| What is Soil Fertility: Information about soil fertility and how it can be improved. |
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