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Differences between plants from different sources decreased with time but 

 a local plant stock was superior to an introduced stock under stressed condi- 

 tions through the first growing season. Greenhouse- grown plants were more 

 costly but no better than field-grown plants. 



Some of the adaptation of Spartina altemiflora to the low oxygen supply 

 and the ammonium form of nitrogen characteristic of the intertidal zone were 

 confirmed by laboratory studies. Plants were detrimentally affected by forced 

 aeration of roots and the substitution of nitrate for ammonium. Stands of 

 Spartina altemiflora continued to respond to high inputs of nitrogen and 

 phosphorus through the fourth year. 



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