evaluation of foramsulforun, rimsulforun and nicosulforun soil residual effect on some pulses under greenhouse conditions

in order to evaluate of pea, bean, lentil, wheat, rape and barley sensitivity to foramsulforun, rimsulforun and nicosulforun herbicides soil residue, a pot experiment was conducted at ferdowsi university of mashhad. experimental type was completely randomized design in factorial arrangement with three replications. treatments included herbicides (rimsulforun, foramsulforun and nicosulforun), herbicide simulated concentration residue in soil (0, 0.1, 0.2, 0.4, 0.9 and 1.3 µg kg-1 soil for rimsulforun; 0, 10, 20, 40, 80 and 120 µg kg-1 soil for foramsulforun and 0, 9, 18, 36, 72 and 108 µg kg-1 soil for nicosulforun, that are 0, 2.5, 5, 10, 20 and 30 % recommended dose for each herbicides, respectively) and crops (pea, bean, lentil, wheat, rape and barley). for analysis of results plants survival percentage, shoot and root biomass measured 30 days after emergence. results showed that crop survival percentage, shoot and root biomass affected with foramsulforun, rimsulforun and nicosulforun soil residual, significantly. increasing foramsulforun and nicosulforun soil residue decreased mentioned parameters in all crops, significantly. increasing rimsulforun soil residue decreased mentioned parameters, significantly just in rape. based on ed50 parameter, bean (99.05 and 34.65 µg kg-1 soil in foramsulforun and nicosulforun, respectively) and barley (0.07 and 0.003 µg kg-1 soil in foramsulforun and nicosulforun, respectively) appeared to be the most tolerant and susceptible crops to foramsulforun and nicosulforun soil residual. based on ed50 parameter, barley (216.02 µg kg-1 soil) and rape (2.29 µg kg-1 soil) appeared to be the most tolerant and susceptible crops to rimsulforun soil residual, respectively.