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Polyvinyl chloride columns (4 × 15 cm) containing by volume either 2 pine bark : 1 moss peat : 0 sand, 2 pine bark : 0 moss peat : 1 sand, 0 pine bark : 1 moss peat : 1 sand, or 2 pine bark : 1 moss peat : 1 sand amended with 3 kg m -3 of 32 P-superphosphate (8.7% P) were leached daily with 16 or 32 ml of deionized water (pH 5.5) in 1 hour. Irrigation rate did not affect 32 P leaching nor was there a media rate interaction or difference in the percentage total 32 P and dissolved 32 P leached. Medium 2:1:1 had the greatest percentage (76%) of 32 P leached during the 3-week experimental period, however, 55% of the 32 P amendment leached from each medium the 1st week.
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Yeager et al. (1984) studied this question.
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