Understanding nitrogen fertilizers
By: G. Andrews.
Contributors: Oregon State University. Extension Service.
Series: EC -- 1492.; Extension circular (Oregon State University. Extension Service) -- 1492.
Publisher: Oregon State University Extension Service
Published: 1998
Place of publication: [Corvallis, Or.]
Language: eng
Subjects: Nitrogen fertilizers.
Other titles: Gardening and water quality protection.
Notes: Title from caption.

"January 1998."

Includes bibliographical references (p. [4]).

Also available on the world wide web.