Studying of the Nitrate Contamination in Garden Cress Plant in Dezful, Khouzestan, Iran

In recent years, there has been much attention to the amount of nitrate. Nitrate is not toxic for animals and human. However, if nitrate reduces to nitrite, it can combine with hemoglobin and form met-hemoglobin. Regarding the importance of this subject, they present research was conducted to study the situation of Garden cress in terms of nitrate contamination in vegetable farms in Dezful city. Samples after being shaking, the extract was separated by centrifuge and nitro Sulfusalicylic complex. Then it was read by spectrophotometer in wave length 410 nm in front of standard solution. Results of analyses indicated that the highest amount of nitrate was seen in the north farm samples of Dezful. Results of statistical analysis revealed significant difference between nitrate amounts in areas under study. Moreover, nitrate concentration was reported less than permitted in Garedn cress. As well, nitrate concentration tested in the morning and afternoon samples showed significant difference and the highest difference was related to north 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.