بررسي وضعيت سلامت محصول كاهو در شمال استان خوزستان از نظر تجمع (باقيمانده) نيترات

Study on the quality of lettuce due to Nitrate in north of Khuzestan Province

اين تحقيق در سال 1393براي بررسي سلامت محصول كاهو توليدي شمال استان خوزستان و تعيين همبستگي مقادير اين آلاينده در خاك و گياه با منابع آلودگي در خاك انجام گرفت . 30 مزرعه در شمال استان خوزستان انتخاب و در هنگام روانه شدن محصول به بازار مصرف ضمن نمونه برداري از خاك و محصول، پرسشنامه مديريت كودي ثبت گرديد. مقدار نيترات خاك به روش دواردوو و غلظت نيترات گياه به روش اسپكتروفتومتري با استفاده از اسيد سولفوساليسيليك ، ميزان نيتروژن كل ، كربن آلي تعيين گرديد. نتايج نشان داد كه ميزان نيترات در 20 درصد از نمونه هاي كاهو بيشتر از حد مجاز مي باشد. يك همبستگي آماري معني دار مثبت بين ميزان نيترات گياه و ميزان نيترات خاك و همچنين بين ميزان كود اوره مصرفي با ميزان نيترات گياه و يك همبستگي آماري منفي بين تعداد تقسيط كودي و ميزان نيترات خاك و گياه مشاهده شد.

Research shows that the chemical fertilizer is one of the most important sources of nitrate contamination in soil and agricultural products.This research was conducted in 2014 in North Khuzestan province in order to determine the healthiness of produced lettuce in North of Khuzestan as well as the correlation between the amounts of contaminants in soil and the plant in relation to the soils contamination sources. 30 farms of the region for soil and product sampling before sending to the market were determined. In this process, a fertilizer management questionnaire for each farm was filled out as well. Soil and plant nitrate was measured by Devardoo and Spetrophotometry method using sulfosaliclic acid respectively. Total nitrogen soils, O.C, also were determined. Results indicated that nitrate concentration was exceeded than the allowed level in 20% of lettuces. There was a positive significant correlation between Plant and soil nitrate, whereas negative significant was observed between soil nitrate and application of fertilizer at several stages. There was also positive significant correlation between organic manure application with plant nitrate while there was a negative significant correlation between application of fertilizer at several stages and plant nitrate content.