One-gram samples of A. fatua L.seeds were soaked for 4, 8, 12 and 16 h in B. nigra leaf aqueous extracts of 4, 8, 12, 16, and 20 g 100 ml1 water.After an 8-h interval, seeds were taken from the solution, blotted for 2 h between two folds of filter paper, and weighed.The water uptake was calculated by subtracting the original seed weight from the final seed weight.Distilled water was used as the control.