Abstract: The effect of boron and iron was studied on wheat subjected to moisture stress. All possible combinations of 0, 2, and 4kg ha-1 of B and 0, 10 and 20 kg ha-1 of Fe were studied in the experiment on Barani-70 variety of wheat which was subjected to early stress by delaying the first irrigation to 20 days after sowing instead of 10 to 15 days after sowing. Logistic function was fitted to shoot mass recorded at 15 days interval and useful biological constants were calculated. Logistic function fitted the data well. B @ 2kg ha-1 and Fe @ 10kg ha-1 and their combination increased AGR and the maximum biomass but their combination at the highest levels decreased the maximum biomass. RGR maximum which occur at initial stage of the crop growth was only increased by iron application @ 20kg ha-1 and by combination of B and Fe at their highest levels.