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Cumulative amount of Si released over time per g of SiO2 in phytoliths (mg bioavailable Si/g SiO2 in phytoliths) by successive extractions with 0.01 M CaCl2. (A) Si released from phytoliths extracted from the organs of five rice cultivars (each phytolith sample is the mixture of same organ from five rice cultivars); (B) Si released from phytoliths extracted from stems of five rice cultivars. Each point represents the mean of three replicates.
