Nitrogen concentrations in slash pine components averaged
 1.01%, 0.:2 0.32%, and 0.18% in foliage, branches, bolebark,
 and bolewood, respectively, and 0.66-, 0.27%, and I'i in
 fine, lateral, and tap roots.

 Phosphorus.-Foliar P levels were significantly increased by
fertilization in both species. However, values are near minimal
for optimum growth of slash pine (9). Water table control did
not significantly influence foliar P levels. This was in contrast
to the foliar N concentrations where water tables were con-
trolled. These increases apparently resulted from greater min-
eralization of N and P from soil organic matter. However, since
Leon soils generally have little capacity for P retention (3),
much of the mineral P is leached from the root zone (Figure 2).
 There were large differences between species, with loblolly
generally containing higher P levels than slash pine. There were
several significant interactions with bolebark and bolewood P
levels (Table 15). These reflect the large increase in biomass
of slash associated with water table control as contrasted with
only a minimal fertilizer response. It may also indicate that
bolebark and bolewood are sensitive indicators to changes in P
levels on various sites.



 Table 5.-The effect of water table control and fertilization on above-
ground biomass distribution of 5-year-old slash and loblolly pines.

 Water Table Bole- Bole-
Species Fertilized Depth Foliage Branches bark wood

 cm -- per cent of total
Slash No Fluctuating 17 11 23 49
Slash Yes Fluctuating 18 11 20 51
Slash No 46 18 11 19 52
Slash Yes 46 19 10 18 53
Slash No 92 18 11 19 52
Slash Yes 92 19 10 19 51
Loblolly No Fluctuating 22 18 16 44
Loblolly Yes Fluctuating 22 17 15 46
Loblolly No 46 22 17 13 48
Loblolly Yes 46 21 16 12 51
Loblolly No 92 22 17 14 47
Loblolly Yes 92 22 17 13 48