I just participated in a farmland restoration project and suddenly found that no-tillage technology is a very effective way to control heavy metal contaminated farmland.
Mechanism of straw returning to soil for prevention and control of heavy metal contaminated soil：First , straw returning has a certain barrier effect on chromium pollution caused by atmospheric deposition;Then, the straw is degraded to release organic matter, which on the one hand increases soil fertility, on the other hand, soil organic matter can be complexed with free chromium to reduce the bioavailability of chromium.
Hi Xinlin, Would you kindly put some parameters around the claim? Paul.
Soil organic matter can act as a trap for metals:
-Cr is immobilized as Cr(III) by redox reactions
-Cu and Pb are complexed by humic compounds
I am no very sure about the quantity of metal that could be retained by those mechanisms.
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