وضعيت تغذيه اي و كيفيت ميوه گوجه فرنگي، فلفل دلمه اي و خيار گلخانه هاي استان اصفهان

چكيده انگليسي :

Abstract Greenhouse make up a major part of vegetables produced in Iran While consumer interest worldwide in the quality of vegetable products has increased in recent years there is very limited information about the quality values Therefore some internal mineral nutrients vitamins heavy metals and external color firmness quality values were determined in greenhouse cucumber tomato and bell pepper produced in Isfahan province In addition the health risks of heavy metals and nitrate NO3 via consumption of the vegetables was estimated using the non cancer hazard quotient HQ and cancer risk assessment estimates Leaves and edible parts of tomato cucumbers and bell peppers and associated topsoil 0 25 cm samples were taken from 25 different greenhouses Concentrations of macro N P K Ca Mg and micronutrients Fe Cu Mn Zn vitamins ascorbic acid citric acid as well as heavy metals Pb Ni Cr Cd were determined in the plant tissues In addition some external quality values e g color and firmness of fruits were determined The mean concentration of N 0 21 and particularly P 229 mg kg 1 and K 665 mg kg 1 in the soils was much higher than their critical deficiency level The mean concentration of DTPA extractable Fe Zn Cu and Mn of the soils were 12 00 4 9 1 98 and 14 50 mg kg 1 respectively Despite the fact that the average concentrations of Pb and Cd were still within the acceptable ranges some greenhouses had higher concentrations of the heavy metals Calcium concentration in cucumber leaves was significantly greater than its critical level while K deficiency was found at most of the sampled leaves Comparing the mean concentration of nutrients in different sampling periods indicated that the leaves sampled at the third period had lower content of K P and N and higher Ca content as compared with the leaves sampled at the first and second sampling periods The Ca concentration was low in the edible part of cucumber while the K and P concentration were higher as compared with the critical level The majority of the vegetables had low to very low content of Fe Cu Mn Zn and ascorbic acid in their edible parts Calcium concentration in the edible tissues of cucumber was positively affected the fruit texture firmness There were also positive and significant relationships between K content and ascorbic acid and or citric acid in the cucumber and tomato In bell pepper the fruit ascorbic acid concentration was positively related to the nitrate concentration Mg concentration in the cucumber had a positive influence on the green color intensity of the fruit There was also a positive relationship between the K concentration and red color intensity of the tomato Nitrate concentration in tomato 125 mg kg 1FW and bell pepper 70 mg kg 1 FW were lower than their health standard levels while cucumber fruit accumulated nitrate in the concentrations 336 mg kg 1FW greater than the WHO standard level Lead concentrations in cucumber tomato and bell pepper samples were 0 20 0 27 and 0 30 mg kg 1FW respectively these are lower as compared with the standard limit 0 5 g g 1 FW The mean Cd concentration in all studied vegetables was lower than the high standard limit 0 1 g g 1 FW The result of the present study showed that most of the vegetables produced in Isfahan greenhouses are deficient in several micronutrients On the other hand there is elevated health risk of nitrate via consumption of indoor produced vegetables pdfMachine A pdf writer that produces quality PDF files with ease Produce quality PDF files in seconds and preserve the integrity of your original documents Compatible across nearly all Windows platforms if you can print from a windows application you can use pdfMachine Get yours now

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وضعيت تغذيه اي و كيفيت ميوه گوجه فرنگي، فلفل دلمه اي و خيار گلخانه هاي استان اصفهان

غلظت سرب و كادميوم , محصولات گلخانه اي