A herbicidal composition capable of preventing weed growth of potatoes or soybean plants consists of a triazene or an aromatic nitro compound together with an inorganic salt, especially sodium bisulfate or potassium bisulfate which reduced the quantity of the organic herbicide below that usually required to obtain a corresponding herbicidal effect and hence prevents phytotoxic damage. The composition contains 0.1:1 to 15:1 parts by weight of the inorganic compound to the organic compound and is applied in an amount of 0.1 to 30 kg of the composition per hectare.
