- Fertilizer Advisory Development and Information Network for Asia and the Pacific - Information on fertilizer use, production and consumption.
- Fertiliser Deficiencies - Papers describing deficiency symptom in crops and field vegetables.
- Soil Fertilizers - Information with regard to soil pH, fertilizers and lime application.
- Soil Fertility Guide - Common fertilizers and their characteristics.
- Sugar Cane Production and Soil Fertility. - Information on the relationship between the quality of sugarcane and soil fertility.
- Soil Fertility - Answers questions related to the enhancement and maintenance of soil fertility.
- Fertilizers, Soil fertility, Plant Nutrition - Information on all aspects of soil fertility and fertilizers.
- Soil test interpretations - Gives examples of soil test values and explains their significance.
- 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.
- Chloride Crop Nutrition - Essential nutrient for plant growth. Testing for deficiencies and effects on plant growth. Effect on plant diseases.
- What is Soil Fertility - Information about soil fertility and how it can be improved.
- The International Fertiliser Society - Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers.
- Getting Back to Basics - Crop information for all US regions and information on soil fertility and fertilizer application.
- European Fertilizer Manufacturers Association - Contains details about plant nutrient requirements, recommendations for fertilizer use and best agricultural practices for fertilizer application.
- 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.
- European Network for Field Vegetable Crops - Environmental problems associated with the nitrogen fertilization of field grown vegetables.
- Fertiliser Manufacturers Research Association - Aims to promote and encourage responsible fertilizer use. Contains many fertilizer fact sheets.
- Soil Characterization - Simple step by step guide to soil sampling and analysis with explanatory images.
- Potentially beneficial effects from liming - 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.
- Field Museum - Educational site for students and teachers about soil and soil biology.
- Efficient Fertilizer Use Manual - Comprehensive online book about proper fertilizer uses, soil pH and soil sampling.
- 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.
- Potassium In Agriculture - The influence of potassium on plant nutrition and soil.
- Plant Nutrition and Soil Fertility Laboratory - Institute of the University in Denmark. Features publications and research reports.
- 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.
- 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 and crop nutrition - The Ontario Ministry of Agriculture and Food offers a large collection of newsletters and factsheets with topics ranging from soil sampling to fertilizer requierements and micronutrients.
- 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.
- Iron Chlorosis - Explains how to detect and combat iron deficiency in plants.
- 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.
- Micronutrient Disorders, HYG-1252-98 - On the deficiencies that may occur in soilless floriculture, and how these can be remedied.
- Manures and Fertilizers - Indian Agricultural Resources. Information about manures, organic, inorganic and biofertilizers.
- Soils and Soil Management - Offers a database and search function of a range of articles about fertilizers, micronutrients and fertilizer application.
- Recommended soil testing procedures - Describes important soil tests and explains how to perform and interpret them.
- Phosphorus and potassium - Describes the phosphorus (P)and potassium (K) soil testing and fertilizer recommendation system in Ontario, Canada.
- 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.
- 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 - Application recommendations for different fertilizers.
- 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.
- Soil Fertility Establishment - Soil fertility management for forage crops. A introduction from the Penn State University's Agronomy Department.
- 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 Conservation and Fertility Management - A detailed description from the International Centre for Integrate Mountain Development. Its main focus is on mountain soils and sloped agriculture in th Hindu-Kish region.
- Soil Quality Institute (SQI) - Research findings and practical technologies that help conserve and improve soil conditions. Applicable to farming, ranching, forestry and gardening.
- Rebuilding Lost Soil Fertility - Measures to improve soils suited to farmers in the third world.
- 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 an
- Fertilizer Industry Federation of Australia - Provides publications and educational material.
- Technical Information - A number of bulletins describing soil analysis, soil types and fertiliser application.
- Soil Fertility - A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies.
- 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.
- Soil Fertility Research - Information about university research with extensive list of publications.
- Preplant Soil Nitrate Tests - Description of tests that allow farmers to adjust nitrogen applications to meet the needs of each specific field.
- How to Apply Fertilizer to Wheat - Application time, forms of fertilizer and methods of application to be considered when applying fertilizer to wheat.
- Phosphorus fertilizers - Describes the effective use of this fertilizer. Soil availability, fertilizer characteristics and application.
- 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.
- Soil Fertility Implications When Converting to Direct Seeding - Describes the different fertilization requirements for direct seeding.
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