4 BULLETIN 1004, U, S. DEPAETMENT OE AGRICULTURE, 
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Fig. 1. — Soil-moisture chart of wheat plat C at the Belle Fourche Field Station in 1916. 
The water content of the upper 4 feet is shown by four curves connecting the points 
indicating the percentage of water in each foot at each date of sampling. 
of a slide rule. The average of the duplicate determinations is the 
figure used as the percentage of water in the unit at the time of 
sampling. 
For purposes of study the data so obtained are reduced to graphic 
form by charting on specially designed blanks. Figure 1 is a repro- 
