The sixth volume of Water-in-Plants Bibl iography includes papers in all fields of plant wa-rer relations research which appeared during the year 1980 - from theore- tical considerations about the state of water in cells and its membl"ane transport to drought resistance of plants or physiological significance of irrigation. In addition to papers devoted entirely to plant water I"elations, papers on other topics are included if they contain data on plant hydration level, water vapour efflux, ra- te of water uptake or \'later transport, etc., or if they contain valuable methodolo- gical informati-on (measurement of selected microcl imatic factors, soi I nx:>isture, etc. ). We have tried to cover fully the relevant papers whi ch have been publ ished in the rTDst important scienti fie periodicals and books. Articles appeared in local journals, mirreographed booklets, abstracts of thesis and of symposia contributions, etc., were chosen rTDstly from reprints received directly from authors. The courtesy of those authors who have already supplied us with reprints and lists of their - bl ications is highly appreciated. The manuscript is usually prepared in ~1ay and June of the year 10110l,ing the year which it covers. Unfortunataly some reprints come later and thus the respective references appear in the following vol ume, with one year delay. To maximize the value of the bibliography the references are alTanged alphabeti- cally according to the authors' names, and each volume is provided "ith three indexes.