BULLETIN 1004, U. S. DEPARTMENT OF AGRICULTURE. 



100° to 110° C. for a sufficient length of time to expel all water, as 

 determined by their coming to a constant weight. 



The dry weight of soil is then determined and the percentage of 

 water to the nearest tenth calculated on a water-free basis by means 



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Fig. 1. — Sail-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- 



