Besides the growth retardant effect, which, in most cases is the main purpose, the plant growth retardants can be successfully used for the treatment of vegetable crops supplying the food industry with raw materials in order to increase the yields and to improve the quality of the products. The results of the tests regarding the phytoregulating action, made on some vegetable cultivars (tomatoes, red peppers, cucumbers, onion), proved that the product Romtrel, obtained according to a procedure of our own, has similar effects, in expression and intensity, with those of Ethrel (produced by Amchem).