Brassica Boron Deficiency

Crucifers, in particular cauliflower, rutabaga, and turnip are susceptible to boron deficiency. Boron deficiency occurs most frequently on coarse or sandy soils, soils with a pH greater than 7.0, and soils subject to excessive leaching. Boron also becomes less available during long periods of drought. Irrigation to maintain an even soil moisture may prevent this disorder. Soils deficient in boron can be treated with a boronated fertilizer. In high pH soils, foliar applications are preferred. Application of boron after symptom expression is usually too late to prevent the problem. Some cultivar variation in susceptibility to boron deficiency exists, but no cultivar is completely resistant.