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Effects of Field Application of 2,4-D and Iron Supplements on Yield and Protein Content of Wheat and Barley and Yield of Beans¹

The isopropyl ester, isooctyl ester, and dimethylamine salt of 2,4-D were applied foliarly to wheat, barley, and beans in the field. The cereal tests were conducted at Tulelake and Davis in northern and central California, respectively. Application of the isopropyl ester consistently increased yields of barley and wheat at both locations when applied at the five- to seven-leaf stage. Applications of the dimethylamine salt and the isooctyl ester did not significantly affect yield. Highest cereal yidds were obtained when the isopropyl ester was used in combination with either FeSO₄ or FeEDDHA. Significant increases in yield of field beans resulted from application of the isopropyl ester. Application of the isooctyl ester combined with FeDTPA greatly increased the protein content of wheat

² Associate Agronomist, Agricultukrist, Farm Advisor, Professor of Agronomy, and Professor of Agronomy, Respectively.

Received for publication June 2, 1966.