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.

How to Apply Fertilizer to Wheat
Application time, forms of fertilizer and methods of application to be considered when applying fertilizer to wheat.

Soil Fertility Implications
Describes the different fertilization requirements for direct seeding.

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.

Phosphorus fertilizers
Describes the effective use of this fertilizer. Soil availability, fertilizer characteristics and application.

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.

Soybean Soil Fertility
Information and discussion on nutrient uptake and yield response to P and K. Recommendations for P and K and some examples of yield response to these nutrients.

Fertilizer and Lime
An overview of various long-term and short-term P and K trials with corn and soybean.

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.

Nutrient management of field crops
A good introduction into the basics of fertilization and soil analysis. It describes the soil and plant processes, macro- and micronutirents and different fertilizer types and their use. Explains the basics of soil sampling and analysis.

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.

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 and possibilities of use in agriculture.

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
The site of the Iowa State University Agronomy ExtensionA offers information, publications, recommendations and resources, including nitrogen, phosphorus, potassium, micronutrients and pH.

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.