Acid extraction of plant boron

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Abstract
Optimum extraction ratio, acid normality, and shaking conditions were established for HCl extraction of boron from plant materials. Within the range of low boron tissue levels (below 50 parts/106) encountered in diagnostic analysis for boron deficiency, the HCl extraction compared favourably with the dry ashing method for determination of total boron in plant materials. Although extraction was incomplete from samples with high boron content (above 80 parts/106), total boron determined by dry ashing was closely predicted from extracted boron. A rapid, yet consistent, HCl extraction for diagnostic plant boron analysis is proposed.

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