44 
Journal of Agricultural Research 
Vol. IX, No. 2 
Table XI .—Loss of water from a uniform soil , J, protected from all loss at the sides and 
below , but fully exposed to evaporation at the surface. Both cylinders were filled on 
March 8 with soil containing 15.2 per cent of water and left for 18 5 days 
Depth of section. 
Water content on opening cylinder. 
Loss of water in 185 days. 
Cylinder I, 
surface 
mulched. 
Cylinder II, 
surface 
compact. 
Average. 
Cylinder I, 
surface 
mulched. 
Cylinder II, 
surface 
compact. 
Average. 
Inches. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
3*7 
3*7 
3*7 
11*5 
ii *5 
IX. 5 
4 - S 
3*8 
4.2 
10. 7 
11. 4 
11.1 
3 . 
5-8 
5*9 
5*9 
9*4 
9*3 
9*4 
4 .. 
6.9 
6.8 
6.9 
8*3 
8.4 
8.4 
5 . 
7*3 
7*7 
7*5 
7*9 
7 * 5 
7 * 7 
6. 
7. 8 
7 * 7 
7.8 
7*4 
7*5 
7*5 
7 . 
8*3 
8.5 
8*4 
6.9 
6.7 
6.8 
8... 
9.0 
9.2 
9.1 
6. 2 
6. 0 
6. 1 
9 ***. 
9.2 
9*4 
9*3 
6. 0 
5*8 
s-g 
10. 
0. 2 
9. 7 
9. 5 
6. 0 
5. s 
5* 8 
11. 
y 
9 - 7 
9.8 
9.8 
5*5 
5*4 
5*5 
12. 
9-7 
10. 0 
9.9 
5*5 
5*2 
5*3 
13 . 
10. 0 
10. 1 
10. 1 
5*2 
5 -x 
5*2 
14 . 
10.1 
10. 0 
10. 1 
5 *i 
5*2 
5*2 
15 . 
10.1 
10. 4 
io *3 
5*1 
4.8 
5 *o 
16. 
10. 0 
10. 3 
10. 2 
5*2 
4.9 
5 *i 
17. 
10. 5 
x°* S 
io* 5 
4 - 7 
4*7 
4 - 7 
18. 
10. 6 
10. 4 
io* 5 
4. 6 
4.8 
4*7 
19. 
10. 6 
10. 7 
10. 7 
4. 6 
4*5 
4.6 
20. 
10. 6 
10. 6 
10. 6 
4. 6 
4. 6 
4.6 
21. 
10. 9 
10. 6 
10. 8 
4*3 
4.6 
4 * 5 
22. 
11. 0 
10. 7 
10. 9 
4. 2 
4 * 5 
4. 4 
23. 
10. 9 
10. 6 
10. 8 
4*3 
4.6 
4 * 5 
24. 
11. 1 
10. 7 
10, 9 
4. 1 
4 * 5 
4*3 
25. 
11. 0 
10. 7 
10. 9 
4*2 
4 * 5 
4 * 4 
26. 
11. 1 
11. 1 
11. 1 
4 * x 
4. 1 
4. 1 
27. 
11. 1 
11. 0 
11. 1 
4. 1 
4.2 
4. 2 
28. 
11. 1 
11. 0 
11. 1 
4. 1 
4. 2 
4. 2 
11. 1 
11. 0 
11. 1 
4. 1 
4. 2 
4. 2 
30 . 
11. 0 
11. 0 
11. 0 
4 * 1 
4.2 
4. 2 
Average.... 
9*5 
9*5 
9*5 
5*7 
5*7 
5*7 
The data obtained from a similar experiment on the same soil but with 
an initial moisture content of only 11.8 and exposed for shorter periods, 
22 and 77 days, are reported in Table XII (3, p. 283). In this case no 
loss of water from the bottom of the soil column was shown during the 
first three weeks; but at the end of n weeks it amounted to 1 per cent, 
and the amount remaining in the lowest 18-inch portion of the column 
also averaged 10.7, the same as remained after the longer exposure of 
the more moist soil. 
