Research Article
Effectiveness of Extractants for Bioavailable Phosphorus in Tropical Soils Amended with Sewage Sludge
Table 1
Phosphorus concentrations in diagnostic leaves of maize plants grown in a Typic Eutrorthox amended annually with sewage sludge for 13 consecutive years and in diagnostic leaves of sugarcane plants grown in a Typic Hapludalf amended once with sewage sludge and sludge compost ().
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: linear regression; RQ: quadratic regression; ns: not significant at 5%. **Values with the same letter within a column are not different (Tukey, ). |