Somebody wrote, photographed, or drew everything in this document, and intellectual property rights are reserved in their entirety. The named author wrote all of the text, giving attribution to ideas, tables, and figures wherever appropriate. The crop deficiency photos are part of a collection that has accumulated for over 35 years at the Univ. of Wisconsin-Extension Service and are used with permission, with special thanks to Drs. Larry Bundy, Keith Kelling, and Emmett Schulte. All rights to further use of the photos remains with the Univ. of Wisconsin-Extension Service. Clipart sources are acknowledged internally.

Any errors in attribution are regretted, and correction is invited.

This page was last modified by Phillip Barak, Univ. of Wisconsin, on 17 Oct 95. All rights reserved. Credits: lady_j, Corel Corp.