Chloride, Nitrogen Form, Lime, and Planting Date Effects on Take-All Root Rot of Winter Wheat

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Abstract
Field experiments conducted in western Oregon [USA] showed that losses caused by take-all root rot of wheat (Gaeumannomyces graminis var. tritici) could be significantly reduced through crop management and fertilization practices. Improved crop performance resulted from seeding late and using fertilizers containing NH4-N, P and chloride (Cl). Increased grain yield of take-all-infected plants was greatest in response to delayed seeding in Cl fertilization, whereas root infection was most effectively suppressed by NH4-N. The potential for take-all was lower when the soil pH was 5.6-6.0. Lime and P applications on a strongly acid (pH 5.2), P-deficient soil reduced the incidence of whiteheads associated with take-all, whereas previous limed treatments on a moderately acid (pH 5.6), high P status soil favored attack by take-all and caused yields to decline.