DEPTH AT WHIGH SAMPLES WERE TAKEN. 
6 70l2” \27018" IB'7024" 
FARTS FEP MILLION OF M'TROGEN AS NITKATES. 
6 
. 
. 
: 
S 
\ 
: 
: 
S 
S 
8 
N 
N 
| 
q 
: 
S 
Fig. 3.—Diagram showing the nitrification of ammonium sulphate in samples of soil from different depths 
from plat 120, Truckee-Carson Experiment Farm. Original nitrate present in samples: Depth, 0 to 6 
inches, 15.36 parts per million; 6 to 12 inches, 8.64; 12 to 18 inches, 6.72; 18 to 24 inches, 3.84; 24 to 36 inches, 
2.88. 
in the previous paragraph. The samples from plat 120 show nitrifica- 
tion varying rather irregularly with depth. Samples from plat 130 
DEPTH AT WHICH SAMPLES WERE TAKEN. 
O06" = 6 7012” l27018” 187024" 247036” 
eae 
ae ere 
Wphates- (lar (3 
Q) 
iw 
Sy 
eS 
SA 
YS 
S% 
es 
XQ 
NS 
Ke 
XS 
| PARTS FER MILLION OF 
CHLOAIDS ANO SULFHATES. 
Fig. 4.—Diagram showing the nitrification of ammonium sulphate in samples of soil from different depths 
from plat 130, Truckee-Carson Experiment Farm. Original nitrate present in samples: Depth, 0 to 6 
inches, 13.3 parts per million; 6 to 12 inches, 6.72; 12 to 18 inches, 9.6; 18 to 24 inches, 7.23; 24 to 36 inches, 
14.4, 
211 
