Following
washing, plant roots were severed from shoots, oven dried at 60 ° C for 72 h
and root weights recorded. In addition, to estimate individual weed species
densities, weed roots were excavated from 8 replicated 1-m 2 quadrats using
predetermined random coordinates. Roots were washed, oven dried at 60°C
for 72 h, and weighed. Data were subjected to analysis of variance (c~ = 0.05 ).
Where significance was indicated, Waller-Duncan separation procedures were
used to separate treatment means.