A study of nitrate contamination in soil and vegetables in dezful

ABSTRACT: In recent years, there has been much attention to the amount of nitrate. Nitrate is not toxic for animals and human. Regarding the importance of this subject, they present research was conducted to study the situation of soil and vegetable in terms of nitrate contamination in vegetable farms in Dezful. Samples were collected from vegetable farms located in northern, southern, eastern, western areas of Dezful, randomly from the first, middle and last rows of the farms. The samples were ground twice using an electric grinder and after weighing the extraction of anion nitrate using distilled water, a certain amount of the sample was tested. After being shaking, the extract was separated by centrifuge and Nitrosulfo salicylic complex was formed using solution like. Results of analyses indicated that the highest amount of nitrate was seen in the samples from north of Dezful. Results of statistical analysis revealed significant difference between nitrate amounts in areas under study. Moreover, nitrate concentration was reported more than permitted in coriander. As well, nitrate concentration tested in the morning and afternoon samples showed significant difference and the highest difference was related to north and western of Dezful. Therefore, in order to obtain low levels of nitrate concentration, considering soil Analysis, organic cultivation, consuming organic and biologic fertilizers, micronutrients and eugenics can be regarded. Because of its high consumption and great changes in nitrate concentration in coriander, further in investigation and continuous control of nitrate concentration is necessary.