» 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

» 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

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

» 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/

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

» 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.    http://www.fertile-minds.org/

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

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

» 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.    http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex621

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

» 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/

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

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

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

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

» 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.    http://ohioline.osu.edu/hyg-fact/1000/1133.html

» 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/

» 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

» 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

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

» 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/

» Manure Nutrient Management    Outlines work being undertaken at the Institute of Grassland and Environmental Research into developing management solutions which maximise use of nutrients by forage and crops and minimise pollution of atmosphere and waters.    http://www.iger.bbsrc.ac.uk/Business/ManureNutrientManagement.htm

» 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    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.    http://ohioline.osu.edu/hyg-fact/1000/1252.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

» Nutrient Value of Slurry and Dirty Water    Factsheet in Welsh and English from the Dairy Development Centre on calculating the nutrient value and maximizing the nitrogen availability of these products.    http://www.ddc-wales.co.uk/client_files/dirty_water1.pdf

» 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

» Potentially Beneficial Effects from Liming    Abstract from a university lecture describing the physical and chemical effects of liming on different soil types.    http://pubpages.unh.edu/~harter/mclean.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

» Recommended Soil Testing Procedures    Describes important soil tests and explains how to perform and interpret them.    http://ag.udel.edu/extension/agnr/soiltesting.htm

» 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

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

» 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

» 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

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

» 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

» Soil Nutrient Management    Outlines research being undertaken at the Institute of Grassland and Environmental Research into the precision management of fertilisers to lower input costs and reduce pollution of water and atmosphere.    http://www.iger.bbsrc.ac.uk/Business/SoilNutrientManagement.htm

» 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/

» 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.    http://ohioline.osu.edu/sag-fact/pdf/Soil_Quality_Test_Kit.pdf

» 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.    http://ohioline.osu.edu/hyg-fact/1000/1132.html

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

» 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

» Soils, Cropping Practices and Fertilizer Use    Describes the fertilizer requirements of different soil types, with particular reference to Alberta.    http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex3896

» Sustainable Soil Management    This publication covers basic soil properties and the necessary management steps toward building and maintaining healthy soils, with a list of further resources.    http://attra.ncat.org/attra-pub/PDF/soilmgmt.pdf

» 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/

» 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.    http://www.omafra.gov.on.ca/english/crops/facts/97-005.htm

» What is Soil Fertility?    Information about soil fertility and how it can be improved.    http://www.dnagardens.com/Articles/What%20is%20soil%20fertility.htm