Root moisture extraction profiles varied from 20 square feet for Kochia scoparia (L.) Schrad, (kochia to 44 square feet for Xanthium pennsylvanicum Wallr. (cocklebur). Weeds within the extremes with increasing root moisture extraction profiles were Eragrostis pectinacea (Michx) Ness (tufted lovegrass), Solanum rostratum Dunal. (buffalobur), Digitaria sanguinalis (L.) Scop. (large crabgrass), Tribulus terrestris L. (puncturevine), Salsola kali L., var. tenuifolia Tausch (Russian thistle), Amaranthus palmeri S. Wats. (Palmer amaranth) and sorghum.
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Davis et al. (1965) studied this question.