6o8 



Journal of Agricultural Research 



Vol. XV, No. ri 



Table IV. — Effect of carbon disidphid and toluol upon Azotobacter and nitrate accumu- 

 lation in soil — Continued 



WATER CONTENT OP SOIL, lO PER CENT 



Treatment. 



Control, o cc . . . . 



Do 



Carbon disulphid : 



o.io cc, 

 o.io cc. 

 0.25 cc. 

 0.25 cc. 

 0.50 cc. 

 0.50 cc. 

 1. 00 cc. 

 1. 00 cc. 

 5.00 cc . 

 5.00 cc , 

 Toluol: 



O.IO cc. 

 0.10 cc. 

 C.25 cc. 

 0.25 cc. 

 0.50 cc. 

 0.50 cc. 

 1. 00 cc. 

 1. 00 cc. 

 5.00 cc. 

 5.00 cc . 



Azotobacter film. 



Typical . 

 ...do.... 



. . .do. 

 . . .do. 

 . . .do. 

 . . .do. 



..do. 

 ...do. 

 . . .do. 

 ...do. 



None. 

 . . .do. 



Typical . 



.'.'.do.'.'.'. 

 ...do.... 

 ...do.... 



(?) 

 None . . . , 

 ...do.... 

 ...do.... 

 ...do.... 



Typical. 

 ..do.... 



. . .do. 

 . . .do. 

 . . .do. 

 . . .do. 



..do. 



..do. 

 , . .do. 



..do. 



None. 



. .do. 



Typical . 

 ..do.... 

 . .do. . . . 

 ..do.... 

 ..do.... 



(?) 

 None . . . . 

 ..do.... 

 ..do.... 

 ..do.... 



Typical . 

 ..do.... 



. . .do. 

 . . .do. 

 . . .do. 

 . . .do. 

 . . .do. 

 ...do. 

 ...do. 

 ...do. 

 None. 

 , . .do. 



Typical . 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 



(?) 

 None 



...do.... 

 ..do.... 



...do.... 



NOs^. 



Mgm. 

 15.0 



IS- 5 



15.0 

 15.0 



16. 5 



17. 2 



IS- 5 

 17. 2 

 16. o 

 16. o 

 6.4 

 15.0 



16. o 

 16. o 



15.0 

 15.0 



9.0 



NHs. 



Trace. 

 Do. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Abundant. 

 Do. 



Trace. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Abundant, 



Do. 



WATER CONTENT OP SOIL, 20 PER CENT 



Control, o cc . . . . 



Do 



Carbon disulphid: 



O.IO cc. 

 O.IO cc. 

 0.25 cc. 

 0.25 cc . 

 0.50 cc. 

 0.50 cc . 

 1. 00 cc . 

 1. 00 cc. 

 5.00 cc . 

 5.00 cc. 

 Toluol: 



O.IO cc. 

 O.IO cc. 

 0.25 cc . 

 0.25 cc . 

 0.50 cc. 

 0.50 cc . 

 1. 00 cc . 

 1. 00 cc . 

 5.00 cc . 

 5.00 cc . 



Typical . 

 . . .do 



. . .do. . 

 ...do. 

 ...do.. 

 ...do., 

 ...do.. 

 . . .do. , 

 . . .do. . 

 ...do., 

 None. 

 . ..do. , 



Typical . 

 ..do.... 

 ..do.... 

 ..do.... 

 . . .do. . . . 



(?) 

 None . . . , 

 ...do.... 

 ...do.... 

 ...do.... 



Typical . . . . 

 ..do 



...do. 

 . . .do. 

 ...do. 

 ...do., 

 . . .do. , 

 . . .do. , 

 . . .do. 

 . . .do. 

 None. 

 . . .do. , 



Typical . . . . 



...do 



...do 



...do 



...do 



(?) 



None 



...do 



...do 



...do 



Typical . 

 . . .do. . . . 



...do. 

 . . .do. 

 . . .do. 

 ...do. 

 ...do. 

 . . .do. 

 ...do., 

 ...do.. 

 None. 

 ...do.. 



Typical. 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do.... 

 None.. .. 

 ...do.... 

 ...do.... 

 ...do.... 



12. 6 

 12. 6 



12. 7 



12. 6 

 13.0 

 13.0 



13. 2 

 12. o 



11. 4 



12. o 



5-S 

 6.0 



12.6 

 16. o 

 13.0 



12. 2 

 13.0 

 13.2 



13. o 



13.2 



10. 9 

 9.6 



Trace. 

 Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Slight. 



Do. 

 Abtmdant. 



Do. 



Trace. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Abundant. 



Do. 



o 1 , 2 , and 3 have reference to time at which cultures were made, i was made after chemical had remained 

 in soil three days, 2 was made after chemical was evaporated, and 3 was cultured after nine weeks' incuba* 

 tion. Nitrates and ammonia were determined after nine weeks' incubation. 



6 Nitrates in milligrams per 100 gm. of soil. 



