An aqueous micronutrient fertilizer foliage spray solution for plants cultivated on peat soils which comprises 0.1 to 5% Mn.sup.2.sup.+ 0.03 to 1.2% Cu.sup.2.sup.+ and 0 to 1.6% Fe.sup.2.sup.+ ions with reference the total weight of the solution and having a weight ratio of Cu.sup.2.sup.
