Learn how to decipher those mysterious numbers appearing on bags of fertilizer. From North Carolina State University Extension.

Offers advice for fertilizing trees, lawns, vegetable crops, and ornamental plants. Requires Adobe Acrobat Reader.

Provides a formula for calculating the amount of nitrogen to apply to lawns. Suggests the best times to apply fertilizers.

Find out how to determine if trees and shrubs need to be fertilized. Includes a discussion of application methods.

Encyclopedia entry provides info on the nutrients of the fertilizer and links to nitrogen, phosphorus, and potassium.

Explore differences between liquid and dry fertilizers. Learn how frequently to apply fertilizer, and the proper place to apply soil amendments.