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Fig. 1. Percent (calculated from sum of the four fractions) of P (A), Al (B), and Ca (C), extracted in 1:100 suspension of poultry litter and extractant (1 h shake time). Statistically different means (significant at P < 0.001) between litters within the same extraction are noted with different letters. Samples 519 and 525 are controls, and samples 129, 181, 182 are alum amended.