hydroponics enthusiast growing

[Nagappan]

Dear Ron I am a hydroponics enthusiast growing leafy and fruit vegetables. Lately I have been concerned about reports that hydroponically grown vegetables may have a high nitrate content. High nitrates in food have been implicated in gastric carcinoma (cancer).I use a universal nutrient formula containing approx.190ppm nitrogen (supplied by Calcium nitrate and KNO3;no ammonium compounds). I wonder if you or anyone has any information confirming or refuting the theory/any other solutions to the problem. Thank you. Dr.Nagappan Penang,Malaysia