|garden by Arthur E. Miller, USDA APHIS PPQ, Bugwood.org|
Root crops, carrots, beet roots, and radishes, had elevated levels of contaminants, but they were still very low and are considered to be very low risk. Leaf and fruit crops had an even lower risk than root crops, very little contaminants were found within the vegetable but there were occasions where contaminated dust was on the surface of the of the food. This dust could be washed away with simply cleaning the food prior to consumption. The overall observation has been that the bioavailability of the contaminants is very low. Some best management practices for growing food on suspected contaminated soils include:
- Test soil for pH and nutrients and amend as needed
- Add organic matter and clean soil to dilute any possible contaminants
- Remember that, while very little of the contaminants are in the vegetables, they are still in the soil and proper clothing should be worn to minimize contact with the soil.
Source Article: Study: With proper care, contaminated urban soils are safe for gardening