Lawn Talk -- http://www.urbanext.uiuc.edu/lawntalk/lawntalk10.html
A range of lawn fertilizing articles beginning with "Choosing Fertilizers for Home Lawns".
Island Lawn and Garden -- http://www.ilg-mv.com/pages/organicvs.html
Concise discussion about organic and inorganic fertilizing along with a number of lawn fertilization topics.
Fertilizer Registration and Penalties -- http://www.agr.state.nc.us/plantind/fert/ferpenl.htm
The North Carolina Department of Agriculture and Consumer Services offers advice on the fertilizer penalty system.
Nitrogen Fertilizer: Ammonium Nitrate -- http://www.inform.umd.edu/edres/topic/agrenv/ndd/agronomy/nitrogen_fertilizer_ammonium_nitrate.html
Detailed chemical factsheet about the properties of ammonium nitrate.
Nitrogen Fertilizer: Ammonium Sulfate -- http://www.inform.umd.edu/edres/topic/agrenv/ndd/agronomy/nitrogen_fertilizer_ammonium_sulfate.html
Factsheet offering information about ammonium sulfate.
Nitrogen Fertilizer: Urea -- http://www.inform.umd.edu/edres/topic/agrenv/ndd/agronomy/nitrogen_fertilizer_urea.html
Chemical information about the properties of urea.
Nitrogen Fertilizer: Diammonium Phosphate -- http://www.inform.umd.edu/edres/topic/agrenv/ndd/agronomy/nitrogen_fertilizer_diammonium_phosphate.html
Factsheet about the chemical properties of diammonium phosphate.
Soils and Soil Management -- http://www.msue.msu.edu/msue/imp/modf1/masterf1.html
Offers a database and search function of a range of articles about fertilizers.
Fertilizer Use and Abuse -- http://royal.okanagan.bc.ca/mpidwirn/agriculture/fertilizer.html
Discusses the uses of fertilizers.
MDS Harris Turf -- http://www.turf.com
A commercial soil-testing laboratory that provides soil and water testing as well as plant and tissue analysis for golf courses and athletic fields, as well as agronomic growers and dealers.
Fertilizer Use -- http://ipmwww.ncsu.edu/agchem/chptr10.html
Articles discussing the uses of fertilizer on certain types of plant (in pdf format).
Fertilizing Woody Ornamentals -- http://aggie-horticulture.tamu.edu/extension/fertilizing/fertilizing.html
Explains the best way to fertilize these types of plants.
Extremely Green Gardening Company -- http://www.extremelygreen.com
Online source for organic gardening products including fertilizers, biological pest control, soil test kits.
University of Maine Bulletin -- http://www.umext.maine.edu/onlinepubs/htmpubs/lawngarden/2287.htm
Information on fertilizers to supplement nutrients in the soil.
Fertilizers for Container Crops -- http://www.umass.edu/umext/programs/agro/floriculture/floral_facts/fert.html
Explains the basics for fertilizing certain types of potplants.
Convenience Fertilizers For Home Landscapes -- http://www.ext.vt.edu/departments/envirohort/factsheets2/fertilizer/sep90pr3.html
Information on fertilizing shrubs and trees on home lanscapes.
Fertilizer Application -- http://gardenline.usask.ca/misc/fertili2.html
Debates whether to fertilize with organic or inorganic products.
Washington State Department of Agriculture -- http://agr.wa.gov/
Information on products and their content of heavy metals, along with fertilizer laws and label requirements.
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