Research Article
Effectiveness of Extractants for Bioavailable Phosphorus in Tropical Soils Amended with Sewage Sludge
Table 5
Mean of phosphorus concentrations extracted by Mehlich-I, H2SO4, and resin from samples collected at three depths from soils treated with varying rates of sewage sludge and composted sewage sludge, in the short-term experiment ().
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RL: linear regression; RQ: quadratic regression; ns: not significant at 5%. **Values with the same letter within a column in the same depth are not different (Tukey, ). |