engleski

The fate of molybdenum contamination in the food chain

A long-term field experiment with different microelement contaminants was set up in 1991 on a calcareous chernozem soil with around 5% CaCO3 and 3% humus in Nagyhörcsök, Hungary. Mo was applied in the form of (NH4)6Mo7O24 at 0, 90, 270 and 810 kg/ha rates. The crop sequence was maize, carrot, potato, pea, beetroot, spinach, wheat, sunflower, garden sorrel and winter barley. Mo induced no yield losses or phytotoxic effect on crops. Mo pollution did not result in soil sterility. The Mo displayed a significant downward movement in soil profile, after 10 years reaching the 130-160 cm soil layer. Generally, the Mo exhibited a hyperaccumulation in crop parts, its uptake increased many thousandfold on heavily polluted plots, compared to the control. This element accumulated in plant and animal organs up to one or two orders of magnitude higher concentrations. The high Mo containing feed can impair spermatogenesis in breeding animals and also pose a risk to consumer regarding dietary products of animal origin.

molybdenum ; food chain ; contamination

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