Journal ArticleReceived for publication July 23, 2002. Soil and xylem are similar hydraulically. An unsaturated conductivity curve for soil is called a vulnerability curve for xylem?but the underlying physical basis is the same. Thus, any transport model that treats unsaturated soil conductivity would benefit by also incorporating the analogous xylem vulnerability curves. The full-text PDF of this article is freely available at http://agron.scijournals.org/cgi/reprint/95/6/136
