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The Boron Content of Tissues and Roots of Rutabagas and of Soil as Associated with Brown-Heart Condition¹

ABSTRACT

Rutabaga (Brassica napobrassica, Mill. var. York) plants were grown on two locations in the field, and on three different soils with four B levels under greenhouse conditions. The B content of rutabaga top tissues showing moderate to very severe brown-heart condition ranged from 6 to 20 ppm. Only slight brown-heart symptoms were observed in tissues containing 23 ppm. The optimum B content of mature rutabaga top tissue was in the range of 38 to 140 ppm. The B content of rutabaga roots was slightly lower under field conditions than under greenhouse conditions, and less than 10 ppm was associated with severe brown-heart condition.

The weight of rutabaga roots on Acadia silty clay loam (Asicl) soil (of marine origin) was significantly higher than that of roots grown on Culloden sandy loam (Csl) and O'Leary sandy clay loam (Oscl) soils. Root weights were negatively correlated with the hot-water soluble B (hwsB) content of soil. Brown-heart symptoms occurred when hwsB in soil ranged between 0.4 and 1.3 ppm. About 1.3 to 1.8 ppm hwsB in soil appeared to be optimum. A content of over 250 ppm B in the top tissue and over 3.1 ppm hwsB in soil was considered to be toxic to the plants. The hwsB content of soils showed a significant positive correlation with the B content of rutabaga tissue.

¹ Contribution no. 189, Research Branch, Research Station, Box 1210, Canada Department of Agriculture, Charlottetown, P.E.I., Canada.

² Research Soil Scientists, Canada Department of Agriculture, Charlottetown.

Received for publication November 5, 1968. Accepted for publication January 22, 1969.