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Effects of Lime and Boron on Brown-heart, Leaf Tissue Calcium/Boron Ratios, and Boron Concentrations of Rutabaga¹

ABSTRACT

A greenhouse study involving four levels of lime and six levels of B, and a field study at two locations involving three levels of lime and five levels of B were conducted on rutabaga (Brassica napobrassica, Mill. var. ‘York’). Brown-heart was more severe at high pH than at low pH under B deficiency conditions. The effect of lime on the appearance of B deficiency symptoms was a physiological effect in the plant rather than a chemical reaction in the soil. However, lime applications, generally decreased the B concentrations of leaf tissue.

Calcium/B ratios in the leaf tissue were inversely related to the hot-water-soluble B content of the soil. Under field conditions, liming increased the Ca/B ratio of leaf tissue in most cases. Calcium/B ratios of 3,300 to 8,500 and B concentrations of 2 to 7 ppm in leaf tissue were associated with very severe brown-heart condition. Leaf tissue Ca/B ratios of less than 400 and B concentrations greater than 40 ppm, when the roots began to enlarge were associated with roots free from brown-heart.

¹ Contribution no. 252, Research Branch, Research Station, Box 1210, Canada Dep. of Agr., Charlottetown, Prince Edward Island, Canada.

² Research Scientists.

Received for publication April 17, 1972. Accepted for publication July 11, 1972.