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. 



417 



