| | Determining Corn Leaf Stages (Purdue Univ.) (Site not responding. Last check: 2007-10-10) |
 | | This method determines leaf stage in corn by counting the number of leaves on a plant with visible leaf collars, beginning with the lowermost, short, rounded-tip true leaf and ending with the uppermost leaf with a visible leaf collar. |
 | | The leaf collar is the light-colored collar-like band located at the base of an exposed leaf blade, near the spot where the leaf blade comes in contact with the stem of the plant. |
 | | Leaf counting then differs, though, by ending not with the uppermost leaf with a visible collar, but at that leaf that is at least 40 to 50 percent exposed from the whorl. |
| www.agry.purdue.edu /ext/corn/news/articles.03/LeafStaging-0520.html (967 words) |