DISTRIBUTION OF MOISTURE IN SOIL COLUMNS. 15 
_ Figure 5 shows graphically the data of Table 6. It will be observed 
_ that in the curves for tubes Nos. 13 and 14 the percentage of mois- 
ture in the first, or bottom inch is greater than that in the second 
and third inches. ‘To this extent they differ from most of the preced- 
ing figures. In both of these curves, after the third inch, there is an 
appreciable rise in moisture percentage followed by a considerable 
length of rather constant moisture content. From the eighth and 
_ the eleventh inches, respectively, there is a rather uniform rapid 
_ decline in the moisture content. The curve for tube No. 15 shows 
a distribution of moisture similar to that in the preceding tubes, 
excepting tubes Nos. 13 and 14. The reason for the differences in 
moisture distribution in tubes No. 13 and No. 15 is not apparent, 
unless it is the difference in the time these tubes stood in position 
before sampling. 
; Referring to Table 6, it is found that in tube No. 13 the maximum 
- percentage of moisture was found in the bottom inch, with almost as 
~ much in the sixth inch. Between the first inch and the sixth inch 
_ there was less moisture than at either of those points. The average 
_ percentage of moisture in this tube was 30.72 per cent, and this per- 
ie ise ee between a te ai and the fourteenth inches or 
more than haliway up the tube. 
_ The lower 11 inches of the tube 8 
_ have 57 per cent of all the moisture 
_ in the tube. 
> 
i=] 
of ane ture 
Seve | | | 
In tube No. 14 the maximum 3/771 RT PRE 
_ moisture content, 40.43 per cent, § WL [_sentecieresoit | TT | TI 
_ was attheseventhinch. Theaver- §&[WYPTT TILT EIT lore loan sit 
2 0 10 20 30 
Inches Above Water 
age percentage of moisture was 
_ 30.98 per cent, and this percentage Fic. 5.—Distribution of moisture in vertical 
i was found at about the fourteenth columns, Santa Clara and Utah loam soils. 
- inch, or a little more than halfway up the tube. In the lower 12 
‘ ae of this tube there was 59 per cent of all the moisture in the 
tube. 
In tube No. 15 the maximum moisture content, 38.21 per cent, was 
at the seventh inch, or about one-third the way up the tube, while in 
_ the first inch it was only 34.07 per cent. The average in this tube 
_ was 29.60 per cent of moisture. This percentage of moisture is found 
_ at the fourteenth inch, or at seven-twelfths of the height of the tube. 
_ The lower half of the tube contains 59 per cent of all the moisture in 
the tube. The bottom fourth of the tube contains an average of 
_ 35.26 per cent moisture, or only 0.76 per cent more than the average 
_ of the second fourth of the tube. 
In tube No. 16, filled with the Cache Valley soil, a rather constant 
_ percentage of moisture was found in the lower third of the tube, 
_ except for the bottom inch. The maximum percentage of moisture 
is found at the eighth inch, or at about one-fifth the height of the 
column. It is noticed that if the first, or bottom inch, be eliminated, 
_ there is a decline in the moisture content from the bottom of the tube 
_ upward for a distance of 3 inches, then a rise in moisture for the next 
_ 3inches. From the ninth to the eleventh inch, inclusive, the moisture 
content is a eately the same. From the eleventh inch to the 
_ top of the tube there is a gradual decrease in the moisture content. 
_ The Cache Valley soil, as represented by this tube, differs from the 
