Boron sprays applied in the fall to ‘Italian’ prune trees ( Prunus domestica L.) not deficient in boron resulted in a significant increase in fruit set and yield the following year. Analysis of midshoot leaf tissue the August following treatment showed no differences in boron content. These data indicate a possible transitory need for boron during the floral development and fruit set processes in ‘Italian’ prune which cannot be diagnosed by traditional leaf analysis.
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Chaplin et al. (1977) studied this question.