302 
Journal of Agricultural Research 
Vol. IX, No. 9 
Table; III. —Physical analysis of the soil of the Greenville (Utah) farm 
Depth of soil. 
Item. 
1st foot. 
2d foot. 
3d foot. 
4th foot. 
5th foot. 
6th foot. 
7th foot. 
8th foot. 
Coarse sand. 
Medium sand. 
Fine sand... 
Coarse silt. 
Medium silt. 
Fine silt.. 
Clay. 
Moisture. 
Soluble and lost. 
Specific gravity. 
Apparent sp.gr. 
Water-soluble salts... 
0. 21 
9 - 63 
30.04 
32.25 
12.30 
6 . 2 K 
7. 62 
1. 60 
. 10 
2. 67 
I. 23 
. 06 
0.17 
8. 29 
32 . 54 
32. 81 
10. 46 
4. 81 
7. 12 
1. 47 
2. 33 
2. 72 
1. 27 
, 11 
0.68 
6.63 
29.49 
32. 62 
10. 89 
7.27 
10. 13 
x - T 3 
1. 16 
2. 80 
I- 30 
. 14 
1. 02 
9- 63 
33 - 
28. 51 
i °-95 
6.94 
7 - 52 
1.49 
■83 
2. 69 
I, 29 
. l6 
0. 09 
9 - 53 
36. 92 
28. 65 
10. 46 
4.85 
7. 82 
•95 
• 73 
2. 76 
*• 33 
. 08 
0. 34 
9. 48 
33 - 79 
30.49 
10. 85 
5- 86 
6. 78 
1. 01 
1. 40 
2. 79 
1. 34 
.09 
0. 47 
8. 91 
35 - 34 
31- 65 1 
9.92 
S' 56 
6. 52 
1. 01 
1. 42 
2. 71 
*• 39 
•15 
0. 09 
7. 08 
34.25 
32 - 6s 
9.89 
5-84 
7 - 57 
.84 
1.99 
2. 76 
1-35 
.09 
PDAN OP EXPERIMENT 
The experimental field was divided into 20 plots one-twenty-sixth of 
an acre in area. Each plot was leveled and banked up around edges, 
so that the water applied would distribute itself equally over the entire 
area of the plot. 
Leading to each series of plots were wooden lateral flumes, so arranged 
that the measured water could be accurately applied. The plan of the 
field and the distribution of the laterals are shown in figure 1. 
The field was divided into five equal sets of plots. The first set was 
left fallow, the second was planted to alfalfa, the third was planted to 
com, the fourth was planted to potatoes, and the fifth was planted to 
oats. One of these sets received a maximum, one a medium, one a 
minimum application of water, and one set was unirrigated. The plots 
were sampled during the spring (about the middle of April), midsummer 
(about the last of July), and in the fall (the last of October or the first 
of November). The samples were analyzed for moisture, nitric nitrogen, 
number of bacteria developing on synthetic media, and the ammonifying 
and nitrifying powers. The irrigation and sampling were so arranged 
that results from the cropped irrigated plots could be compared with the 
unirrigated plot of the same series and also with the fallow plots receiv¬ 
ing a corresponding amount of irrigation water. 
The arrangement of the plots, crop growing upon each, and amount of 
water applied during the last nine years are indicated below: 
(а) Alfalfa: 
Plot 31G, 37.5 inches of water applied in five equal irrigations. 
Plot 32 G, 25 inches of water applied in five equal irrigations. 
Plot 33G, 15 inches of water applied in five equal irrigations. 
Plot 34G, unirrigated. 
(б ) Potatoes: 
Plot 35G, 37.5 inches of water applied in five equal irrigations. 
Plot 36G, 25 inches of water applied in five equal irrigations. 
Plot 37G, 15 inches of water applied in five equal irrigations. 
Plot 38G, unirrigated. 
