Timothy was grown under greenhouse conditions with 6 levels of soil B and A pH values. No significant yield increases were obtained with added B, although values as low as 2.8 ppm B in the tissue were obtained. Boron toxicity symptoms on leaves were obtained with B additions at the rate of A mg/kg soil. Tissue B concentrations of greater than 102 ppm were associated with B toxicity symptoms and decreased yields. Liming decreased the B concentration of the leaf tissue; such decreases were more marked at higher rates than at lower rates of B. Liming the soil to pH 6.5 decreased the yield of timothy. However, the decreased yield at higher pH levels was not corrected by application of B as observed under similar conditions on forage legumes, but was probably caused by Mn deficiency.