290 Proceedings of Indiana Academy of Science 
TABLE 5. 
Series 1 West—Rotation Corn, Wheat, Beans. 
Plot 1 Corn Plot 2 Wheat Plot 3 Beans 
Nitrates—Parts per ; Nitrates—Parts per ; Nitrates—Parts per 
Month Moisture million Moisture million Moisture million 
G7, ed ip ee 7 _ 
“a Fresh | Incubated Ss Fresh | Incubated . Fresh | Incubated 
Samples} Samples Samples} Samples Samples} Samples 
Marcle ce cee Pata 12.87 37.55 20.4 18.07 42.16 PDA TS 4.12 37.11 
April. . pari f 6.63 22.12 PA TEAI 12.14 36.43 22.2 4.11 36.96 
Mayne te cere 18.37 5.87 35.18 18.88 | 9.84 27.55 17.27 1.93 19.30 
JUNE eck yee ee 17.41 38.70 88.97 12.38 3.65 18.24 16.13 19.00 53.33 
Duly aac 18.23 78.27 93.75 17.39 7.74 19.34 15.32 18.85 33.96 
AT eUuBboecereer 19.76 | 99.60 | 179.28 16.26 Ditto 8.74 18.96 5.92 13.80 
September....... 14.58 14.79 7.48 14.30 1.86 5.60 14.11 1.86 22.35 
Octobersec-bs se 22.56 4.13 12.38 23.44 2.09 8.36 21.59 4.08 8.16 
Total per period.. 260.86 | 476.71 61.12 166.42 59.87 224.97 
Ave. per month. .| 32.60 59.58 7.64 20.80 7.48 28.12 
June and July for the corn plot, in March, April and May for the 
wheat plot, and in March, April, June and July for the soybean plot. 
The highest results for the corn and soybean plots conform very 
closely to the period of cultivation, while the highest results for the 
wheat plot were obtained just before and immediately after the grow- 
ing season, for the fresh samples, and from March to August for the 
incubated samples. 
TABLE 6. 
Series IIT West—Continuous Corn. 
Plot 1 Corn 
Nitrates—Parts per million 
Month Moisture % |— 
| Fresh Incubated 
Samples Samples 
} 
March 25.4 | 21.41 34.26 
Aira ethane stent eee tere in oan Rich naa ae 27.8 | 4.43 22.02 
My ee ee een erie ae eiriceaaeie cae: 18.32 29.35 78.27 
TRIGA Aes Pee aistaste c.02 Beate 15.88 22.80 60.83 
Tully ccste eae ok a phan cS Caen fet aaa 18.01 | 42.93 50.68 
JANIS oe cis cor teritie ec ol elo isis rashes aah, Scie eee 16.63 14.97 40.22 
Reptemberiene 3 cc Gets een tJ peas ee 14.17 9.31 18.63 
Ogtober wit 2 5: eee. e- eps ae ee re ere 22.21 6.17 8.23 
Total for PetOd ek’. sees. ck k she Pete a twas epee bee at ee 151.37 313.14 
(AVed Der TOME tee + eat ot. aseictecl owt cc erate oes ed Sala ie eta 18.92 39.14 
DISCUSSION OF TABLE 6. 
Series III West—Continuous Corn. 
The average nitrate content of the fresh samples for the period 
was 18.92 parts of nitrate per million parts of moisture-free soil. The 
content was high from March to July, inclusive, with the exception of 
the month of April, the sample for which was taken just after the plot 
was plowed, and was lower from August to October. The highest point 
was reached in July. 
