Sensitivity of different vegetables to imazapic residue in soil

In order to study the effects of imazapic residue on growth of vegetables，experiments were conducted by growing 13 kinds of vegetables succeeding to the field with initial imazapic dosage of 108 g/hm2. The results showed that imazapic residue obviously affected cucurbitaceous vegetables（ cucumber，Zucchini，white melon） and leaf vegetables（flowering Chinese cabbage，cabbage mustard，senvy，red spinach）. The inhibition rate of their plant height，root length and upside fresh weight varied from 31% to 95%，which was significant. As for Solanaceous vegetables（ eggplant，tomato，pepper and potato） and long bean，the inhibition effect varied for different vegetables and different parts of the vegetables；the root length and plant height for sweet corn did not have significant difference compared to control group. Moreover，4 kinds of vegetables were grown in lab with modeling imazapic residue dosage from 0 to 96μg/kg. By comparing their ID50 and ID10 value for plant height and root length，we can conclude the order of sensitivity to imazapic: cucumber > flowering Chinese cabbage > pepper > bean；ID50 and ID10 value also showed that roots were more sensitive than stem. Therefore，it is not recommended to use imazapic if succeeding corps are leaf vegetables and cucurbitaceous vegetables.