Table XXV. Results of nitrogen fixation determinations on plants 

 at site 2, 22 July - 3 Aug, 1970. 



Ethylene produced 

 (fimoles/hr x 10-') 



Equivalent N tixed 

 (Hg-at N/hr x iO-'j 



* Currently being identified 



In addition to the terrestrial sites, several aquatic environments were sampled for nitrogen 

 fixation. Nitrogen fixation assays were done on the water and sediment of ponds B and C during 

 the first week of June. No positive results were obtained, indicating that nitrogen fixation was 

 not an important input into these ponds at this time. Similar experiments during July and August 

 did not show any nitrogen fixing activity. Several ponds and waters with algal mats were sampled 

 in order to make nitrogen fixation assays. The only positive results in the aquatic environment for 

 nitrogen fixation were for algal mats collected from Footprint Creek. The Footprint Creek results 

 were: 



Sample 



Ethylene produced 

 (ijjnoles/br 



10-^) 



Equivalent N fixed 

 {{ig-at N/hr x 10-^) 



Footprint Creek 

 No. 1 - 1 Aug 



Footprint Creek 

 No. 2 - 1 Aug 



0.64 

 1.28 



0.42 



0.85 



58 



