The aim of this study is to investigate the impact of root density and root length density of grass on the erodibility of root-permeated saturated topsoils. Three plots were established on a sandy loam. Their treatments were bare, low density
. Treatments were 1) bare, 2) grass (representing a fine-branched root system), 3) carrots (representing a tap root system and 4) carrots and fine-branched weeds (representing both tap and fine-branched roots). The soil types tested were a sandy loam and a silt