Table 3 Effects of meat & bone meal ash (MBMA) and dried distillers grain ash (DDGA) application on sequentially extracted P fractions in soil (mean ± SE).
Treatment | Resin Pi | NaHCO3 Pi | NaHCO3 Po | NaOH Pi | NaOH Po | HCl Pi | Residual P | |
|---|---|---|---|---|---|---|---|---|
P source | Rate (kg ha−1) | μg P g−1 soil | ||||||
Control | 0 | 7 ± 4de | 12 ± 5c | 20 ± 4bc | 52 ± 1abc | 124 ± 11a | 115 ± 10de | 105 ± 8b |
MP | 25 | 15 ± 5 cd | 32 ± 3ab | 15 ± 1c | 56 ± 2abc | 116 ± 5a | 70 ± 18e | 103 ± 6bc |
50 | 22 ± 3bc | 24 ± 2abc | 17 ± 2c | 52 ± 3abc | 94 ± 7bc | 119 ± 19de | 105 ± 4bc | |
100 | 54 ± 4a | 32 ± 4ab | 16 ± 1c | 59 ± 2ab | 100 ± 3b | 132 ± 17 cd | 96 ± 8bcd | |
MBMA | 25 | 9 ± 2de | 9 ± 3c | 27 ± 3ab | 39 ± 2bcd | 69 ± 4d | 198 ± 23b | 107 ± 1b |
50 | 7 ± 2de | 13 ± 3c | 25 ± 1abc | 39 ± 2bcd | 76 ± 5 cd | 179 ± 19bc | 109 ± 4b | |
100 | 8 ± 1de | 20 ± 4bc | 23 ± 1abc | 38 ± 2 cd | 73 ± 3 cd | 313 ± 18a | 129 ± 7a | |
DDGA | 25 | 6 ± 1e | 13 ± 1c | 23 ± 1abc | 32 ± 1d | 65 ± 4d | 158 ± 17bcd | 90 ± 2 cd |
50 | 10 ± 1de | 18 ± 2bc | 29 ± 3ab | 48 ± 10abcd | 75 ± 3 cd | 161 ± 7bcd | 85 ± 1d | |
100 | 25 ± 1b | 35 ± 5a | 31 ± 3a | 62 ± 9a | 76 ± 4 cd | 199 ± 28b | 93 ± 8bcd | |
P > F | ||||||||
Source of variation | *** | |||||||
P source | *** | *** | *** | *** | *** | *** | ** | |
Rate | *** | *** | ns | * | ns | *** | ns | |
P source × Rate | * | * | * | ** | * | ns | ||
