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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 - An 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 fertilizer 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 Application and Placement - Provides general guidance on the purchase, use and timing of nitrogenous fertilizers and on the application of phosphorus, potassium and sulphur.
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.
Getting Back to Basics - Crop information for all US regions and information on soil fertility and fertilizer application.
Guidelines for Choosing a Soil-Testing Laboratory - Provides guidance for growers in evaluating a laboratory before supplying soil samples to determine concentrations of plant-available nutrients.
The International Fertiliser Society - Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers.
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 - Provides information on specific micronutrients, how to recognize deficiences and excesses, and how to correct the situation after identifing the problem by soil and foliar analysis.
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.
The Phosphorus and Potassium Soil Testing and Fertilizer Recommendation System in Ontario - Ontario has developed a soil testing service with a strong scientific basis which relies on the correct method of extraction of available nutrients and accurate forecasting of the response of crops to the resulting fertilizer 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 - Abstract from 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 - Application recommendations for different fertilizers.
Soil Fertility - A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies.
Soil Fertility - Answers questions related to the enhancement and maintenance of soil fertility.
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 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 Guide - Common fertilizers and their characteristics.
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 Quality Test Kit - Information on a kit developed in conjunction with Ohio State University for testing soil for active organic matter as a measure of quality. [PDF]
Soil test interpretations - Gives examples of soil test values and explains their significance.
Soil Testing is an Excellent Investment for Garden Plants and Commercial Crops - Soil testing is an inexpensive way of maintaining good plant health and maximum crop productivity and this factsheet provides guidance on why, when and how to test soil.
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.
Soils, Cropping Practices and Fertilizer Use - Describes the fertilizer requirements of different soil types, with particular reference to Alberta.
What is Soil Fertility? - Information about soil fertility and how it can be improved.