302 
TABLE 5 
Fresh Nitrates 
(Parts per million calculated on a Dry Basis) 
Plot 
No. | Mar. April May June July Aug. Sept. Oct. Nov. Total Ave. 
| 
1 21.00 8.15 | 20.90} 15.80 10.70 12.91 16.82 7.89 14.15 | 128.32 14.26 
2 29.00 9.30) 8.80 7.25 35.80 15.31 30.20 16.10 29.00 | 170.76 18.97 
3 29.60 11.40 8.91 6.30 18.60 22.80 50.90 20.22 24.50 | 193.23 21.47 
4 16.90 12.30 8.80 3.79 28.10 9.50 17.20 10.10 18.08 | 124.77 13.86 
5 17.80 10.40 | 12.61 3.60 7.01 10.42 11.10 6.12 10.02 89.08 9.90 
6 21.80 20.10 8.79 5.48 11.00 11/32 15:15 7.08 17.31 | 118.03 Ase 
7 23.80 | 14.30 7.92 3.63 7.31 9 51 15.40 10.70 13.15 | 105.72 11.74 
8 24.20 13.20 15.7 | 3.58 18.52 12.12 13.08 11.10 13.60 | 125.11 13.90 
9 25.00 16.20 11.70 4.50 10.91 13.10 13.09 7.00 10.00 | 111.50 12.39 
10 26.00 17.10 | 7.85 3.51 22.00 12.10 13.03 8.55 14.08 | 124.28 13.80 
11 16.40 16.10 10.31 | 8.94 14.31 8.35 14.85 | 10.00 16.00 | 115.22 12.80 
12 21.90 10.00 7.78 3.56 28.70 | 11.10} 16.50 8.04 10.96 | 118.54 13.17 
13 20.80 | 12.00 9.75 | 5.38 18.21 7.40 12.81 5.05 12.12 | 103.52 11.50 
i | | _ 
Total) 294.20 | 170.55 | 139.83 75-38 |-281.37 | 155.94 | 230.493") 127745"| 203/07 |... 181.87 
Ave..| 22.63 13:12 10.76 5.80 17.79 | 12.00} 17.70 9.80 15.62 | 126.22 14.00 
low average nitrate content for June was probably due to the rapid 
crop growth and dry weather occurring at that time. But the low aver- 
age for October was probably influenced by heavy rains just preceding 
the taking of the samples. 
Manure plots Nos. 2 and 3 were highest for March and November. 
This was probably due to the residual effect of the manure. In con- 
trast with these plots the N plot, No. 11 was lowest for March and 
low in November; this plot was higher than the manure plots for 
April, May, and June, and showed the least variation for the period. 
The average parts of nitrate for check plot, No. 1, was .26 higher 
than the average for all plots. The other three check plots Nos. 5, 9 
and 13 were all low with an average for the three of 11.26 or 2.74 
parts lower than the average for all plots, and .48 lower than the 
lowest treated plot, No. 7. 
The three plots Nes. 4, 6, and 8 receiving N P K, N P, and N K, 
respectively, had an average for the period of 13.62. But the average 
of the plots Nos. 7, 10, and 12 which received no nitrogen in their 
treatments was 12.90 for the period. This was .72 less than the aver- 
age for the plots receiving nitrogen in addition to these treatments. 
It seems, from these results, that check plot, No. 1, was influenced 
by the treatment from the manure plots next to it. Manure treatment 
had a tendency to produce nitrates continuously throughout the period. 
Any one of the treatments increased nitrate content over no treat- 
ment. Nitrogen combined with phosphorus or potassium gave a higher 
nitrate content than when nitrogen was used alone or when phosphorus 
and potassium were used without nitrogen. 
NITRATES AFTER TWO WEEKS INCUBATION EXPRESSED IN PARTS PER 
MILLION PER GRAM OF Dry Sort (Table 6). 
This test was intended to show the amount of nitrates that would 
accumulate when the soil was placed under optimum conditions. It 
