The herbicidal activity of Diuron against the test plants was determined following the procedure described pre-
viously [22]. In this procedure gradient concentration below the solubility limit was prepared and added to sev-
eral plastic pots containing 10 seeds of the test plant (Jew’s mallow Corchorus olitorius). The pots were then
transferred to the growth chamber for 2 weeks and irrigated as necessary. After 2 weeks % growth inhibition of
the tested plant was calculated according to growth inhibition equation