After the pond soils containing organic sludge were treated in the first phase, shrimp pond water and the same amount of organic sludge added in the first phase were transferred into the experimental tanks in order to simulate a second crop of shrimp. In the beginning of the experiment in the third phase (day 0), pH of pond bottom soils in all groups increased (Table 2), compared to those of the same treatment during the end of the first phase (Table 1). Although there was no significant difference (P > 0.05) in pH between treated and control groups at the beginning of the experiment, a significant decline (P < 0.05) was observed in all groups except treatment 2 over the experimental period ( Table 2). At the end of the experiment (day 15), pH of soils in treatment 2 and 3 remained near neutrality with average values of 7.39 ± 0.16 and 7.07 ± 0.05, respectively, while those of other treatments were slightly acidic (6.46 ± 0.07 to 6.71 ± 0.09).
After the pond soils containing organic sludge were treated in the first phase, shrimp pond water and the same amount of organic sludge added in the first phase were transferred into the experimental tanks in order to simulate a second crop of shrimp. In the beginning of the experiment in the third phase (day 0), pH of pond bottom soils in all groups increased (Table 2), compared to those of the same treatment during the end of the first phase (Table 1). Although there was no significant difference (P > 0.05) in pH between treated and control groups at the beginning of the experiment, a significant decline (P < 0.05) was observed in all groups except treatment 2 over the experimental period ( Table 2). At the end of the experiment (day 15), pH of soils in treatment 2 and 3 remained near neutrality with average values of 7.39 ± 0.16 and 7.07 ± 0.05, respectively, while those of other treatments were slightly acidic (6.46 ± 0.07 to 6.71 ± 0.09).
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After the pond soils containing organic sludge were treated in the first phase, shrimp pond water and the same amount of organic sludge added in the first phase were transferred into the experimental tanks in order to simulate a second crop of shrimp. In the beginning of the experiment in the third phase (day 0), pH of pond bottom soils in all groups increased (Table 2), compared to those of the same treatment during the end of the first phase (Table 1). Although there was no significant difference (P > 0.05) in pH between treated and control groups at the beginning of the experiment, a significant decline (P < 0.05) was observed in all groups except treatment 2 over the experimental period ( Table 2). At the end of the experiment (day 15), pH of soils in treatment 2 and 3 remained near neutrality with average values of 7.39 ± 0.16 and 7.07 ± 0.05, respectively, while those of other treatments were slightly acidic (6.46 ± 0.07 to 6.71 ± 0.09).
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