Fertilizer.com - Definitions of different types of fertilizers, along with a range of information about lawn and garden care.

Island Lawn and Garden - Concise discussion about organic and inorganic fertilizing along with a number of lawn fertilization topics.

Fertilizer Registration and Penalties - The North Carolina Department of Agriculture and Consumer Services offers advice on the fertilizer penalty system.

Pesticides and Fertilizers in Turfgrass Environment - Article detailing the application of fertilizers to turf.

Nitrogen Fertilizer: Ammonium Nitrate - Detailed chemical factsheet about the properties of ammonium nitrate.

Nitrogen Fertilizer: Ammonium Sulfate - Factsheet offering information about ammonium sulfate.

Nitrogen Fertilizer: Urea - Chemical information about the properties of urea.

Responsible Fertilizer Practices for Lawns - Outlines general fertilizer practices, nitrogen and phosphorus requirements, and application timing for lawns.

Nitrogen Fertilizer: Diammonium Phosphate - Factsheet about the chemical properties of diammonium phosphate.

Plant Nutrients - Article describing how each of the thirteen soil nutrients affect growing plants.

Soils and Soil Management - Offers a database and search function of a range of articles about fertilizers.

Washington State Department of Agriculture - Information on products and their content of heavy metals, along with fertilizer laws and label requirements.

Fertilizer Use in the Yard and Garden - A guide to determining what the chemical numbers used by fertilizers mean.

Fertilizer Zone - An introduction including guides on how to, when to, and how much fertilizer to use.

Fertilizer Use and Abuse - Discusses the uses of fertilizers.

Fertilization of Lawns - Details the benefits of and how to fertilize lawns.

MDS Harris Turf - 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 Recommendations for Homeowner Lawns - Discusses the different components of fertilizing lawns.

Fertilizer Application - Debates whether to fertilize with organic or inorganic products.

Fertilizer Use - Articles discussing the uses of fertilizer on certain types of plant (in pdf format).

Fertilizers for Container Crops - Explains the basics for fertilizing certain types of potplants.

Fertilizing Landscape Plants - Explains the necessities of fertilizing plants.

Fertilizing Lawns - Tips for fertilizing home gardens and in particular lawns.

Fertilizing Woody Ornamentals - Explains the best way to fertilize these types of plants.

Extremely Green Gardening Company - Online source for organic gardening products including fertilizers, biological pest control, soil test kits.

Sunray Organic Fertilizer - Soil fertility and environment friendly concepts

Fertilizer - Articles discussing different aspects of fertilizing.

About Minerals - What minerals do for plants and soil.

University of Maine Bulletin - Information on fertilizers to supplement nutrients in the soil.

Fertilizer Facts - Discusses the factors to consider when choosing a fertilizer.