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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

High grain yields (6 to 10 t/ha) of spring habit small grain cultivars are typically obtained in the Tulelake Basin of northern California (41°58′N, 121°28′W, 1230 m elevation) in the April to September growing season. In an attempt to identify environmental factors important in attaining high grain yields, a 3‐year study with four dates of planting (17 April to 7 May) and four seeding densities (100 to 400 seeds/m2) were used to modify the crop growth cycles of seven cultivars or populations of barley (Hordeum vulgare L.), wheat (Triticum aestivura L.) and triticale (X Triticosecale Wittmack). Solar radiation and heat units (maximum air temperature −5°C) were computed for each of three growth periods: early vegetative (EVP), early reproductive ERP), and late reproductive (LRP). Grain yields declined later planting dates; wheat and triticale were more strongly affected than barley. There was little effect of seeding densities on grain yields. Path coefficient analysis revealed the following relationships: Solar radiation, while strongly and positively cor. related with the length of early vegetative period (EVP) in all three crops, was negatively related to grain yield per day, while heat units positively affected the rate of grain yield formation during EVP. Both solar radiation and heat units were positively related to the length of the late reproductive period (LRP) all three crops. For barley there was a strong negative effect of solar radiation and heat units during the LRP on grain yield per day, in contrast to the strong positive effect of these parameters on wheat and triticale. These results suggest that barley required less solar and heat unit energy than wheat and triticale to produce maximum grain yield. Higher temperature and lower solar radiation during the early vegetative period appeared to be beneficial for all three crops.