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area (12 m 2 ) , and was an exception to the relatively uniform
topography of the experimental site, it served to emphasize the
importance of adequate drainage for plantings of Puccinellia .
When cover is averaged over treatment for the period from
September 1979 to September 1980, the cover value for plugs increased
two fold whereas that for sprigs increased by about 40%. Average
survival over this same period of time was 22% higher for plugs than
for sprigs. Sixteen months after planting, cover for plugs was
significantly higher in the Mag Amp + Osmocote 3 (estimated to last for
3 months) treatment and for sprigs it was significantly higher in the
ammonium sulfate + concentrated superphosphate treatment (2.8 g N + 1.2
g P). The controls achieved only 14 and 33% of the cover of the best
treatments for sprigs and plugs, respectively, over this 16-month
period.
Response to Fertilization
Kerlavos
Analysis of variance of cover and dry weight data of plug type
transplants of Puccinellia on a disturbed site at Kerlavos indicated a
significant response to fertilizer materials (Tables 7, 8). One year
after planting the cover of plugs in all three fertilizer treatments
containing both nitrogen and phosphorus was significantly greater than
that of plants in those treatments which provided only nitrogen or
phosphorus or neither (Table 7). These results emphasize the
requirement for fertilizer materials on those disturbed sites which
substrate samples indicated contained amounts of nitrogen and
phosphorus which were too low for good initial growth of transplants.
The dry weight of aboveground plant samples from the Mag Amp +
Osmocote 3 slow release fertilizer treatment was significantly greater
than that of plants from any other treatment at 4 and 16 months after
planting (Table 8). Although cover in the Mag Amp + Osmocote 3
treatment was not significantly different from that in the two
conventional ammonium sulfate + concentrated superphosphate treatments
1 year after planting, by 16 months after planting, cover of plants in
this Mag Amp + Osmocote 3 treatment was significantly greater than that
of those in any other treatment. Cover of plants in this treatment was
about twice that of transplants in the second best treatment. The
center row of transplants (plugs) in Figure 3 3 is the Mag Amp +
Osmocote 3 treatment. These data indicate the advantage of a slow
release over a conventional fertilizer material on this disturbed site
for a relatively long period (16 months). We excavated the
portion of several healthy transplants in the Mag Amp +
belowground
Osmocote 3
treatment and noted that the fertilizer material still present below
the transplant could be identified after 4 months (Fig. 35).
Cover in the control plants remained significantly below that of
plants in those three treatments which provided both nitrogen and
phosphorus 16 months after planting. Cover in these control plants was
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