The present experiment was conducted to investigate the effect of ammonium molybdate on some biochemical indices of broad bean plant in Ahvaz climatic conditions (Khuzestan, southwest of Iran). Experiments were carried out the field with the following treatments: control (without the use of molybdenum), soil application of ammonium molybdate (1.5 and 3 kg/ha), leaf spraying of ammonium molybdate (10 and 20 mg/ L), soil application of ammonium molybdate (1.5 Kg /ha) + leaf spraying of ammonium molybdate (20 mg/ L) and soil application of ammonium molybdate (3 Kg /ha) + leaf spraying of ammonium molybdate (10 mg/ L). The results showed that increased significantly in all molybdenum treatments compared to and after soil application of ammonium molybdate (3 Kg /ha) + leaf spraying of ammonium molybdate (10 mg/ L), the highest amount of  seed molybdenum was observed. The use of molybdenum significantly reduced the amount of nitrate in seeds and shell of broad bean pod. The lowest nitrite in seed was observed in leaf spraying of ammonium molybdate (20 mg/ L). Application of 3 kg/ha of ammonium molybdate significantly increased the soluble carbohydrates (, and glucose) and the protein content of Also, the highest amount of phenolic in seed was observed in plants treated with 1.5 and 3 kg/ha of ammonium molybdate. The results showed that both methods of soil application and molybdenum spray application altered the biochemical composition of seeds and pods.

Keywords: Ammonium molybdate, Leaf spraying, Legum, Micronutrients, Soil application, Yield

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