Apparent Concussion 540 K Apparent Concussion 540 K is a non selective herbicide for the control of many annual and perennial weeds. Apparent Concussion 540 K Herbicide is a non-volatile, non selective, water soluble liquid herbicide for the control of annual and perennial grasses and broadleaf weeds in a wide range of agricultural and non-agricultural use situations. It may be used for weed control on agricultural land prior to sowing any edible or non-edible crop but not prior to transplanting tomato seedlings. When applying this product prior to transplanting crops into plastic mulch, care must be taken to remove residues of this product from the plastic prior to transplanting. Residues can be removed by 2 cm of natural rainfall or by applying water via a sprinkler irrigation system. Apparent Concussion 540 K Herbicide is absorbed by plant foliage and green stems. It is inactivated in the soil and does not provide residual weed control. Apparent Concussion 540 K Herbicide moves through the plant from the point of contact to and into the root system. Initial visible effects on annual weeds take 3 – 7 days but may not be noticeable for 2 to 3 weeks under cool cloudy conditions or on some perennial weeds.