The influence of ammonium humate obtained from peat on the wheat plant tolerance to high CuSO4 concentrations (100, 250, 500, and 1000 μM/l) was studied. Seeds were germinated on cop-per sulphate solution with and without the humate. Then the plants were grown on Hoagland’s solution in an artificial climate chamber. The humate protective action coefficient was estimated in two ways, namely: by dry weight changes and by copper ion content in comparison with the plants grown without humate.