IOWA ACADEMY OF SCIENCE 
191 
TABLE II. 
POUNDS PER ACRE. 
• 
Date 
N in 
Nitrites 
N in 
Nitrates 
N in Free 
Ammonia 
N in Al- 
buminoid 
Ammonia 
Total 
1912 
December 20 
0.0174 
0.0303 
0.0620 
0.0386 
0.1483 
December 25 
0.0042 
0.0154 
0.0203 
0.0105 
0.0504 
December 2 6_ 
0.0073 
0.0091 
0.0053 
0.0264 
0.0481 
December 30 
0.0014 
0.0127 
0.0197 
0.0528 
0.0886 
1813 
January 9 
0.0054 
0.0216 
0.0075 
0.0108 
0.0453 
January 13 
0.0008 
0.0253 
0.0208 
0.0272 
0.0801 
February 1 
0.0014 
0.0224 
0.0154 
0.0051 
0.0443 
February 13 
0.0082 
0.0309 
0.0328 
0.0390 
0.1109 
February 24 
0.0014 
0.0008 
0.0130 
0.0049 
0.0201 
February 25 
Trace 
0.1016 
0.2977 
0.0509 
0.4598 
March 2 
Trace 
0.0980 
0.0325 
0.0325 
0.1630 
March 11 
0.0010 
0.0363 
0.0347 
0.0254 
0.0974 
March 14—1 
0.0070 
0.0571 
0.0270 
0.0210 
0.1151 
March 14—11 
0.0070 
0.0690 
0.0290 
0.0230 
0.1280 
March 20 
0.0020 
0.0998 
0.0822 
0.0420 
0.2260 
April 13 
Trace 
0.0136 
0.0934 
0.0384 
0.1454 
April 17—1 
0.0020 
0.0408 
0.1066 
0.0749 
0.2243 
April 17—11 
0.0027 
0.0463 
0.0583 
0.0403 
0.1476 
April 21 
Trace 
0.0136 
0.0096 
0.0117 
0.0349 
April 25 — 
0.0002 
0.0283 
0.0135 
0.0163 
0.0583 
April 28 
0.0408 
0.0998 
0.0654 
0.0693 
0.2753 
May 2 _ 
Trace 
0.0330 
0.0875 
0.0862 
0.2067 
0.1162 
0^9067 
1.1342 
0.7562 
2.9133 
May 10 
0.0142 
0.0170 
0.0361 
0.0230 
0.0003 
May 11— I 
Trace 
0.0545 
0.1107 
0.0953 
0.2605 
May 12—11 
0.0029 
0.0125 
0.0392 
0.0362 
0.0908 
May 14 
0.0046 
0.0510 
0.1200 
0.0981 
0.3337 
May 20 
0.0113 
0.1200 
0.0214 
0.0182 
0.1709 
May 21 
0.0028 
0.0125 
0.0199 
0.0187 
0.0539 
0.2120 
1.1742 
1.4815 
1.0457 
3.9134 
We desire to express our hearty thanks to W. E. Molding and John 
W. Liddle for conducting the experiments described in the foregoing. 
