ABSTRACT
Roots of wild oat (Avena fatua L.) and wheat (Triticum aestivum L. cv. Marshall) were exposed to varying concentrations of six adjuvant preparations (Agral 90, Atplus 41 IF, Enhance, Renex 36, Tween-20, and Triton X-100). Four of the surfactants, Agral 90, Enhance, Renex 36, and Triton X-100, altered normal rhizospheric pH patterns by inducing rhizospheric alkalization instead of acidification or by preventing rhizospheric acidification. The extent and location of these pH changes on the roots varied according to species, surfactant, and surfactant concentration. Compared to control plants only Agral 90, Enhance, and Renex 36 induced a statistically significant rise in ion leakage from root tissue. Atplus 41 IF and Tween-20 had no significant effect on solution conductivity or on alteration of normal rhizospheric pH patterns.
