Table D-4. Organic matter content of natural mud collected by 

 anchor dredge from the Patuxent River (Long Point)'. 



Collection date 

 (1973) 



Sample No. 



Organic content 

 (mean ± standard deviation) 



Standard error 

 of the mean 



17 June 



1 



2 

 3 



9.4120 ± 1.0038 

 10.3580 ± 1.0272 

 10.9400 ± 0.3270 



0.3174 

 0.4594 

 0.1463 



28 June 



1 

 2 

 3 



9.8740 ± 0.3808 

 9.4720 ± 0.4127 

 8.9120 ± 0.6079 



0.1703 

 0.1846 

 0.2719 



14 July 



1 

 2 



11.2467 ± 0.5555 

 10.0983 ± 0.8682 



0.2268 

 0.3545 



27 Aug. 



1 

 2 

 3 

 4 



11.4483 ± 0.8321 

 11.4617 ± 0.7849 

 11.9700 ± 0.6712 

 12.6483 ± 0.4317 



0.3397 

 0.3205 

 0.2740 

 0.1762 



18 Sept. 



1 



11.8567 ± 0.3038 



0.1240 



25 Sept. 



1 

 2 

 3 



11.4217 ± 0.4881 

 11.8750 ± 0.5131 

 11.2200 + 0.4626 



0.1993 

 0.2095 

 0.1889 



^Samples were dried for 24 hours at 100' Celsius, ground fine with a mortar 

 and pestle, then ashed for 3 hours at 500° Celsius. Organic matter 

 values reported are percent loss of dry weight on ignition. 



Table D-5. Comparison of means of organic matter 

 determinations by collection date. 



Sample collection 

 dates 

 (1973) 



28 June 



14 July 



27 Aug. 



18 Sept. 



25 Sept. 



17 June 

 28 June 

 14 July 

 27 Aug. 



18 Sept. 



1 





p < 0.001 

 p < 0.001 

 p < 0.001 



p < 0.001 

 p < 0.001 



p < 0.001 

 p < 0.001 



p < 0.001 













^Not significant. 



88 



