significantly below that of those same three fertilizer treatments 2 

 years after planting even though these initial control plants were 

 fertilized with Mag Amp + Osmocote 3 in September 1980. Although 

 comparison of the original fertilizer treatments is confounded and may 

 not be entirely appropriate in May 1981 since all transplants were 

 refertilized in September 1980, it is interesting to note that the same 

 three fertilizer treatments with both nitrogen and phosphorus continued 

 to have cover values which were significantly higher than those of 

 plants in any other treatment. Cover of transplants in the best 

 fertilizer treatment achieved an average radial spread of about 10 cm 

 annually (Fig. 36). At this rate of spread, these Puccinellia plants 

 would achieve complete substrate cover in about 3 years after planting 

 (Fig. 37). 



FIGURE 36. A 2-year old Puccinellia transplant with an average 

 diameter of ca. 60 cm and cover of ca. 2,800 cm^ or 112 

 times that of the transplant at planting. 



397 



