June x6 ,1923 Azotobocter Flora and Nitrogen Fixing Ability of Soils 92 9 
Table XI.—Type of growth, nitrogen fixed, and reaction of soils from different States, 
Series IV —Continued. 
Soil 
No. 
State. 
I^imed. 
Type of film. 
Microscopic picture 
Nitro¬ 
gen 
Azoto¬ 
bacter. 
Ph 
colori¬ 
Ph 
electro¬ 
fixed. 
metric. 
metric. 
434 
New York.. 
+ 
Nontypical.. 
Typical Azo- 
Mgm. 
6.1 
+ 
6.2 
6.84 
.do. 
tobacter. 
435 
436 
+ 
0 
None 
Azotobacter (?) 
No Azotobac¬ 
' 7*3 
4.4 
5-7 
5*0 
6.23 
4.98 
.do. 
.do. 
— 
.do. 
ter. 
437 
+ 
Typical Azo- 
Typical Azo¬ 
8*3 
+ 
6.3 
6.72 
438 
South Caro- 
tobacter. 
tobacter. 
0 
Nontypical... 
6.4 
+ 
5-1 
4.98 
lina. 
439 
0 
Typical Azo- 
tobacter. 
.do. 
8.9 
-f 
7.6 
8.14 
440 
+ 
0 
do 
6.8 
5-3 
4 - 
6.8 
4.9 
7.84 
4.00 
441 
Nontypical o ,. 
.do. 
442 
.do. 
+ 
None. 
No Azotobac¬ 
4.2 
— 
4.9 
5 ‘i 5 
ter. 
443 
.do. 
+ 
0 
.do. 
do 
A A 
5*2 
7.0 
5*34 
7.20 
444 
Pennsylva¬ 
Typical Azo- 
Typical Azo¬ 
4.4 
7.6 
+ 
nia. 
tobacter. 
tobacter. 
445 
.do. 
0 
None. . . 
No Azotobac¬ 
S-6 
559 
5*2 
ter. 
446 
.do. 
0 
. . . . do 
Azotobacter (?) 
Typical Azo¬ 
6.3 
8.0 
4.8 
7-4 
5-07 
8.41 
447 
+ 
Typical Azo- 
+ 
tobacter. 
tobacter. 
448 
.do. 
+ 
.do. 
..-.. .do. 
8.1 
+ 
8.2 
8.25 
4.24 
449 
0 
None. 
No Azotobac¬ 
4.7 
4.6 
ter. 
265 
Missouri.... 
0 
.do. 
.do. 
5-0 
4.5 
5-8 
4.7 
5-2 
6.9 
4-36 
, 4.97 
7.10 
266 
.do. 
0 
.do. 
.do 
267 
.do. 
+ 
Typical Azo- 
Typical Azo¬ 
+ 
tobacter 
tobacter. 
268 
.do. 
0 
.do. 
. -. . do 
9.1 
7-5 
+ 
+ 
7*1 
6.7 
7.67 
7.18 
269 
0 
® One sample only. 
Tabi,^ XII .—Correlation between reaction and presence of Azotobocter in soils of 
Series IV 
Ph determined electrometrically. 
Ph determined colorimetrically. 
Soil 
No. 
Ph. 
Azoto¬ 
bacter. 
Soil 
No. 
Ph. 
Azoto¬ 
bacter. 
Soil 
No. 
Ph. 
Azoto¬ 
bacter. 
Soil 
No. 
Ph. 
Azoto¬ 
bacter. 
447 -•• 
8.41 
+ 
445 -•• 
5-59 
__ 
448... 
8.2 
+ 
401... 
5.6 
+ 
448... 
8.25 
-f . 
336... 
5-58 
— 
309... 
7.8 
+ 
431 -•. 
5*6 
+ 
439 ••• 
8.14 
+ 
429... 
5-51 
— 
439 *•• 
7.6 
+ 
429... 
5*5 
— 
309... 
8.14 
+ 
346... 
5-51 
— 
303••• 
7-4 
— 
336... 
5*5 
440... 
7.84 
+ 
307 --- 
5-49 
35 I••• 
7-4 
+ 
341 •. 
5*5 
— 
366... 
7.84 
+ 
333 - 
5-47 
— 
447 -*- 
7-4 
+ 
419... 
5*5 
+ 
391... 
7-77 
421... 
5-42 
+ 
329... 
7.2 
4 - 
423... 
5*5 
+ 
351 - •• 
7-74 
+ 
338... 
5-39 
— 
368... 
7-1 
+ 
338... 
5*5 
•— 
268... 
7.67 
+ 
372... 
5-37 
— 
268... 
7-1 
+ 
381... 
5*4 
— 
368... 
7.48 
+ 
443 -•• 
5-34 
— 
312... 
7.0 
421... 
5*4 
+ 
370... 
7-45 
385-.. 
5-31 
— 
322... 
7.0 
-I. 
328... 
5*3 
303••• 
7.38 
— 
397 -- 
5-30 
— 
324... 
7.0 
+ 
443 -*- 
5-2 
— 
312... 
7-33 
— 1/ 
337 -•• 
5-27 
— 
330 -•• 
7.0 
+ 
445 -•• 
5*2 
— 
403•• • 
7-30 
+ 
386... 
524 
-- 
334 -. 
7.0 
+ 
226... 
5*2 
— 
432... 
7*30 
+ 
339 *•• 
5-24 
— 
370... 
7.0 
+ 
333 -•• 
5*2 
— 
352. .. 
7.20 
+ 
362... 
5-24 
-- 
403... 
7.0 
+ 
337 -*. 
5*2 
— 
444. .. 
7.20 
"f 
409... 
5-19 
— 
444... 
7.0 
+ 
357 -•• 
5*2 
— 
» L=»Iyimed soil. 
