Soils and Soil Management
- Offers a database and search function of a range of articles about fertilizers, micronutrients and fertilizer application.
- http://web1.msue.msu.edu/msue/imp/modf1/masterf1.html

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.
- http://www.soils.umn.edu/academics/classes/soil2125/doc/labunts.htm

Fertilizers, Soil fertility, Plant Nutrition
- Information on all aspects of soil fertility and fertilizers.
- http://www.agnet.org/library/soilfert/

Phosphorus and potassium
- Describes the phosphorus (P)and potassium (K) soil testing and fertilizer recommendation system in Ontario, Canada.
- http://www.omafra.gov.on.ca/english/crops/facts/97-005.htm

Recommended soil testing procedures
- Describes important soil tests and explains how to perform and interpret them.
- http://ag.udel.edu/extension/agnr/soiltesting.htm

European Fertilizer Manufacturers Association
- Contains details about plant nutrient requirements, recommendations for fertilizer use and best agricultural practices for fertilizer application.
- http://www.efma.org/

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.
- http://www.omafra.gov.on.ca/english/crops/soils/fertility.html

Field Museum
- Educational site for students and teachers about soil and soil biology.
- http://www.fieldmuseum.org/undergroundadventure/

Soil Fertility Implications When Converting to Direct Seeding
- Describes the different fertilization requirements for direct seeding.
- http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex181?opendocument

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.
- http://ianrpubs.unl.edu/Soil/g901.htm

Phosphorus fertilizers
- Describes the effective use of this fertilizer. Soil availability, fertilizer characteristics and application.
- http://ianrpubs.unl.edu/Soil/g601.htm

How to Apply Fertilizer to Wheat
- Application time, forms of fertilizer and methods of application to be considered when applying fertilizer to wheat.
- http://ianrpubs.unl.edu/FieldCrops/g889.htm

Preplant Soil Nitrate Tests
- Description of tests that allow farmers to adjust nitrogen applications to meet the needs of each specific field.
- http://www.cias.wisc.edu/wicst/pubs/ppnt.htm

Soil Fertility Research
- Information about university research with extensive list of publications.
- http://www.wye.ic.ac.uk/sme/projects/soil/index.html

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.
- http://soils.usda.gov/technical/

Soil Fertility
- A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies.
- http://extension.agron.iastate.edu/soilfertility/

Fertilizer Industry Federation of Australia
- Provides publications and educational material.
- http://www.fifa.asn.au/default.asp?V_DOC_ID=839

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
- http://www.kieserite.com/

Soil Quality Institute (SQI)
- Research findings and practical technologies that help conserve and improve soil conditions. Applicable to farming, ranching, forestry and gardening.
- http://soils.usda.gov/sqi/

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.
- http://www.jdb.se/sbfi/publ/boston/boston7.html

Soil Fertility Establishment
- Soil fertility management for forage crops. A introduction from the Penn State University's Agronomy Department.
- http://www.cas.psu.edu/docs/casdept/agronomy/forage/docs/fertility/fertilityBdoc.html

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.
- http://www.fertile-minds.org/

Soil Fertility for Forage Crops
- Gives detailed description of the soil and fertilizer requirements of forage crops during establishment and maintenance. University of Pennsylvania.
- http://www.cas.psu.edu/docs/casdept/agronomy/forage/docs/fertility/fertility.html

Manures and Fertilizers
- Indian Agricultural Resources. Information about manures, organic, inorganic and biofertilizers.
- http://www.indiaagronet.com/indiaagronet/Manuers_fertilizers/Manure_Fert.htm

Micronutrient Disorders, HYG-1252-98
- On the deficiencies that may occur in soilless floriculture, and how these can be remedied.
- http://ohioline.osu.edu/hyg-fact/1000/1252.html

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.
- http://www.msue.msu.edu/msue/imp/modf1/modf1t.html

Iron Chlorosis
- Explains how to detect and combat iron deficiency in plants.
- http://ohioline.osu.edu/hyg-fact/1000/1009.html

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.
- http://www.gov.mb.ca/agriculture/soilwater/soilfert/fbd02s00.html

Soil Fertility Management
- Frequently asked questions about soil fertility, the application of animal wastes, organic and chemical fertilizers. Also features an online discussion forum.
- http://web.aces.uiuc.edu/faq/faq.pdl?project_id=16

Foliar Fertilizer
- Introduction to the sources of, and the uses of foliar fertilizer.
- http://foliarfert.com/

Plant Nutrition and Soil Fertility Laboratory
- Institute of the University in Denmark. Features publications and research reports.
- http://www.agsci.kvl.dk/planteer/indexuk.htm

Potassium In Agriculture
- The influence of potassium on plant nutrition and soil.
- http://www.potash-info.com/home.htm

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.
- http://syllabus.syr.edu/esf/rdbriggs/for345/syllabus.htm

Efficient Fertilizer Use Manual
- Comprehensive online book about proper fertilizer uses, soil pH and soil sampling.
- http://www.back-to-basics.net/efu/efu.html

Fertilizer and Lime Research Center, New Zealand
- Agricultural use and the environmental impact of fertilizer, lime and soil amendments.
- http://www.massey.ac.nz/~flrc/

Potentially beneficial effects from liming
- A university lecture describing the physical and chemical effects of liming on different soil types.
- http://pubpages.unh.edu/~harter/mclean.htm

Fertiliser Manufacturers Research Association
- Aims to promote and encourage responsible fertilizer use. Contains many fertilizer fact sheets.
- http://www.fertresearch.org.nz/

European Network for Field Vegetable Crops
- Environmental problems associated with the nitrogen fertilization of field grown vegetables.
- http://www.hri.ac.uk/enveg/

International Fertilizer Development Center
- Production and agronomic effectiveness of fertilizers.
- http://www.ifdc.org/

International Fertilizer Industry Association
- Describes the production, distribution and consumption of fertilizers, their intermediates and raw materials
- http://www.fertilizer.org/

Getting Back to Basics
- Crop information for all US regions and information on soil fertility and fertilizer application.
- http://www.back-to-basics.net

The International Fertiliser Society
- Scientific, technical, environmental, economic and safety aspects of the production, marketing, use and application of fertilizers.
- http://www.fertiliser-society.org/

What is Soil Fertility
- Information about soil fertility and how it can be improved.
- http://www.dnagardens.com/what_is_soil_fertility.htm

Chloride Crop Nutrition
- Essential nutrient for plant growth. Testing for deficiencies and effects on plant growth. Effect on plant diseases.
- http://www.ppi-far.org/chloride/index.html

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.
- http://www.qpais.co.uk/npk/infoindx.htm

Soil test interpretations
- Gives examples of soil test values and explains their significance.
- http://www.cahe.nmsu.edu/pubs/_a/a-122.html

Sugar Cane Production and Soil Fertility.
- Information on the relationship between the quality of sugarcane and soil fertility.
- http://www.cipav.org.co/lrrd/lrrd7/2/9.htm

Soil Fertilizers
- Information with regard to soil pH, fertilizers and lime application.
- http://www.ncw.wsu.edu/lime.htm

Fertiliser Deficiencies
- Papers describing deficiency symptom in crops and field vegetables.
- http://www.msue.msu.edu/msue/imp/modf1/modf1d.html