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Although there was considerable variation in response to
fertilizer materials and rates, both nitrogen and phosphorus were
required for good transplant growth on the disturbed sites tested.
Slow release fertilizer materials produced better growth over a wide
range of substrate types than did the conventional, more soluble
fertilizer materials. Higher survival and better growth were obtained
with Halimione and Puccinellia transplants than with those of the other
three species tested. Aboveground growth of the best experimental
plantings of Puccinellia spread radially at the rate of about 10 cm
annually. At this rate of spread, these experimental plantings would
achieve complete substrate cover in about 3 years after planting.
Refertilization at various periods after planting produced a
significant increase in cover.
Halimione sprigs were dug at the rate of about 180 per person hour
and plugs of Puccinellia at the rate of about 7 5 per person hour.
Transplants of both species were planted and fertilized at the rate of
about 40 per person hour. Sites in the natural marsh from which
Puccinellia transplants were dug, were replanted and became almost
completely revegetated within 1 year. Nursery areas were established
for both Halimione and Puccinellia and estimates indicated that in May
1981 they contained about 6,000 transplants of Puccinellia and 1,000 of
Halimione . Preliminary data indicate that other marsh plants invade
our plantings more rapidly than they invade unplanted disturbed sites.
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