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Response to Ref ertilization
Analysis of variance indicated that refertilized Puccinellia
transplants produced significantly more cover than those not
refertilized (Table 11). Without ref ertilization transplant cover
increased by 2.1 times from September 1980 to May 1981 whereas with one
ref ertilization in September 1980 cover increased 2.9 times by May
1981. Those plants refertilized tiwce (May and September 1980)
increased their cover 3.8 times by May 1981 or by 1.9 times between May
and September 1980 and by 1.9 times between September 1980 and May
1981. One ref ertilization increased cover 1.4 times that of the plants
which were not refertilized over an 8-month period and two
ref ertilizations increased cover 1.8 times that of the unref ertilized
plants over a period of 1 year.
TABLE 11. Cover of Puccinellia transplants at two sampling dates for
three fertilizer treatments 3 at Kerlavos, planted May 1979.
Treatment
Not fertilized
Refertilized Sep 1980 c
Refertilized May 1980 d
and again Sep 1980 c
Cover (cm 2 ) b
Sep 1980 May 1981
222
221
428
a All treatments were fertilized in May 1979 at planting.
b Standard error of difference among equally replicated treatment
means = 115, n=1 1 .
c Refertilized with Mag Amp + Osmocote 3 (2.8 g N, 4.1 g P per
transplant) .
d Refertilized with Osmocote 8-9 + P (2.8 g N + 1.2 g P per
transplant) .
Response to Fresh Oil
In the spring of 1980 oil from the Tanio reached the estuary at
Kerlavos. Although it was observed on several of our 1979 transplants,
we could not document any adverse effects. We decided to take
advantage of the opportunity to plant in some of the fresh oil deposits
along a creek bank. The marsh surface of the planting site had been
removed in a cleanup of Amoco Cadiz oil earlier. The fresh Tanio oil
was a superficial layer on the substrate which did not appear to
penetrate into the substrate. In May 1980 transplants of Halimione and
403
460
645
833