Abstract
1. Five riparian herbaceous weeds, Leonotis nepetaefolia, Cassia tora, Ageratum conyzoides, Parthenium hysterophorus and Sida acuta, dominant on the banks of the Rihand river and Pant Sagar reservoir at Renukoot (India), were selected to assess experimentally their quantitative role in binding the soil, reducing water run-off and conserving phosphorus. Young seedlings from the banks were sown on sloping experimental garden plots. Simulated rainfall totalling 42.5 mm was applied at 30 cm h −1 on five vegetated and one bare plot. 2. Run-off water and eroded soil were collected from each experimental plot in artificial reservoirs and their quantities measured
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