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The two-year field study was aimed to investigate the effect of increasing soil boron treatments (3.3, 6.7 and 13.3 g H3BO3/m2) on eight wheat cultivars, as well as to estimate the rate in which yield decreases followed the increase in soil boron. A strong positive linear relationship was found between the treatments and soil hot water extractable boron. On average, wheat yield response to elevated soil boron was decrease of 7.7%. Cultivars of local origin over-yielded foreign cultivars at all levels of boron supply. The estimated yield loss was 1.8% per increase in soil boron of 0.1 ppm.