Effectiveness of Extractants for Bioavailable Phosphorus in Tropical Soils Amended with Sewage Sludge

Table 6

Correlation matrix for phosphorus extracted from soils at depths of 0–10, 10–20, and 20–40 cm and phosphorus levels in diagnostic leaves of sugarcane plants grown in those soils, for the short-term experiment ().

	Mehlich-I	H2SO4	Resin	Plant
	0–10 cm
Mehlich-I	—	0.98^**	0.94^**	ns
H2SO4		—	0.97^**	ns
Resin			—	ns
Plant				—
	10–20 cm
Mehlich-I	—	0.98^**	0.75^**	ns
H2SO4		—	0.77^**	ns
Resin			—	ns
Plant				—
	20–40 cm
Mehlich-I	—	0.99^**	0.80^**	ns
H2SO4		—	0.77^**	ns
Resin			—	ns
Plant				—

ns: not significant at 5%; ^**significant at 1%.