The amount of P associated with various P pools for the
surface (0–15 cm) and subsurface (15–30 cm) soils in 1989 and in
1998 as affected by P rate and cover crop species. Mean values of
various soil P fractions in the P rate and cover crop treatment are
averaged over all cover crops and all P rates, respectively. Numbers
followed by the same letter in each column (lower case) or each row
(in capital) are not significantly different at P =0.05 using Duncan’s
multiple range test
Subsurface soil