Boron deficiency and response in white and red clovers and lucerne

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Abstract
White clover (T. repens L.), red clover (T. pratense L.) and lucerne (M. sativa L.) were grown in the glasshouse on a soil low in available B. Six rates of B and 3 rates of lime in factorial combination were applied. B deficiency symptoms developed in all 3 species and these are described. Dry matter responses to B were greater for red clover and lucerne than for white clover. Critical B concentration ranges in plant material of 13-16, 15-18 and 17-18 ppm were established for white clover, red clover, and lucerne, respectively. Lime had little effect on DM [dry matter] yield but reduced B concentration in the plants in early cuts.