Fig. 1 Total number of weeds in the pots with the different incorporated mulch treatments (2%) during the 6-wk greenhouse experiment (Herbicide at RD) (SD = max. SD = 10) (P < 0.05). (1st wk, velvetbean and herbicide are significantly different; 2nd wk, there are three groups: (a) = velvetbean and jackbean, (ab) = jumbiebean and Control; (b) = Herbicide and wild tamarind; 3rd and 4th wk, there are two groups, (a) = velvetbean, jackbean, and jumbiebean, (b) = Control, Herbicide and wild tamarind; 5th wk velvetbean, jackbean, wild tamarind, and Herbicide are significantly different from Control; 6th wk, Herbicide, wild tamarind, and jackbean are significantly different from Control)