DISTRIBUTION AND HABITAT. 



11 



Analyses of soil samples taken from the wild-rice beds near Bemidji, Minn. 



Sample number. 



Per cent 

 passing 

 2-mm. 



sieve. 



Per cent 

 organic 

 matter. 



Per cent 

 C0 2 . 



nitrogen. T J.,i% n 



1 



85.3 

 95.7 

 98.9 



0.-63 



9.05 



10. 89 



0.08 

 18.00 

 26.17 



0. 04 4. 700 



2 



. 20 1, 208 



.^ 



.65 1,114 







Analyses of soil samples from wild-rice beds on Potomac flats. 



Per cent 

 Sample number. j p 2 a ^ g 

 sieve. 



Per cent 

 organic 

 matter. 



Per cent 

 C0 2 . 



Percent R f sa a u ce 

 nitrogen. ra ™ iLa 



4 87.7 



5 98.3 



6.00 

 3.61 



0.20 

 .24 



0. 14 805 

 .18 1,141 



Analyses of soil samples from ivild-rice beds at Chesapeake Beach, Md. 



Sample number. 



Percent 1 Percent 

 passing orL C n c 

 2-mm. Sw^l 

 sieve. matter - 



Per cent 

 C0 2 . 



P*cent ' R ^ a a ;r 

 nitrogen. ' ra f ed a ^ LcI 



6 



1 

 95. 7 1 - 56 



0.16 

 .23 

 .66 



0. 07 333 



7 



98.9 

 90.9 



1.30 

 1.86 



.06 45 



8 



. 06 42 









fflThis heading refers to the electrical resistance of the saturated soil. In a general war, the elec- 

 trical resistance of a saturated soil varies inversely with the content of soluble salts. See Bulletin 

 No. 8, Division of Soils, U. S. Department of Agriculture, "An Electric Method of Determining the 

 Soluble Salt Content of Soils," by Milton Whitney and Thomas H. Means; also see " Chemical Exam- 

 ination of Alkali Soils," by Atherton Seidell, page 65 et seq., in Bulletin No. 18, Division of Soils, 

 U. S. Department of Agriculture, "Solution Studies of Salts Occurring in Alkali Soils," by Frank K. 

 Cameron, Lyman J. Briggs, and Atherton Seidell. 



Water soluble constituents in soil samples from Chesapeake Beach, Md. 



Sample number. 



co 3 . 



HC0 3 . 



CI. 



S0 4 . 



Ca. 



Mg. 



Na. 



K. 



Total. 



6 



Per ct. 



0.034 



Trace. 



Trace. 



Per ct. 



0.048 



.108 



.120 



Per ct. 



0. 042 



.380 



.408 



Per ct. 



0.016 



.018 



.062 



Per ct. 



0. 018 



.084 



.032 



Per ct. 



0.006 



.018 



.022 



Per ct. 



0.044 



.174 



.250 



Per ct. 



0.016 



.030 



.032 



Per ct. 

 0.224 



7 



.812 



8 



926 







Sample No. 1 was taken from near Bemidji, Minn. The lake bot- 

 tom at this point bore practically no vegetation except the wild rice 

 plants. The soil was hard and sandy and covered with a thin layer of 

 pine bark and debris. While the plants were not numerous, they were 

 vigorous and apparently doing very well. 



Sample No. 2 was also taken near Bemidji, Minn., from the midst 

 of a wild rice field where the water was 21 inches deep and the soil 

 was hard and sticky below a thin layer of soft mud. This layer of 

 soft mud, which the sample represents, was about -1 inches thick at 



