Aug. 20, 191 7 



Relation of Soil Water Movement 



397 



tions mentioned in the table. At a ranch near Madrid all were within 

 half a mile of the rain gauge and at McCook within 4 miles; the 

 other fields were between the neighboring stations, Wauneta and Im- 

 perial, which are about 15 miles apart, some nearer the former and the 

 others nearer the latter. In each case the samples were composites from 

 10 individual samples taken not less than 10 yards apart. In most of 

 the fields the surface foot was sampled only in 6-inch sections (Table IV) ^ 

 but 12 of them were sampled in 3-inch sections (Table V). The hygro- 

 scopic coefficients of the samples range from 1.9 to 14. The ratio of 

 water content to coefficient is in general not far from unity, the lowest 

 for the foot section being 0.7. In a few cases, as with fields 51, 52, and 

 53 (Table V), a light rain (Table III) had raised the ratio in the uppermost 

 section; in fields 1 1 and 44 drifting snow, which had collected among the 

 small trees during the winter, on melting had affected the moisture content. 



Table IV. — Ratio of the moisture content to the hygroscopic coefficient in the upper and 

 lower halves of the surf ace foot in various fields in southwestern Nebraska in the spring 

 of igii 



March 24. 



25. 



April I. . . 



3- •• 



March 25. 

 April 3 . . . 



March 30. 



April 20. . 



March 27. 



29. 



April 13 . . 



Locality. 



McCook.. 



...do 



Wauneta. 



....do 



Imperial. . 



...do 



Wauneta. 



do... 



Madrid 



do... 



do.... 



Wauneta. 

 do... 



Imperial. , 



Wauneta. 



Imperial. , 

 do... 



Madrid... 



do.... 



do... 



Wauneta. 



do... 



do... 



do... 



do... 



Imperial. 

 do .... 



Wauneta. 



Madrid. . . 



Imperial. 



McCook.. 



Wauneta. 



do.... 



do... 



do.... 



do... 



Imperial. 



do... 



do.... 



do.... 



McCook . . 



do.... 



do... 



Madrid... 



McCook.. 

 do.... 



Imperial. 



Field 



No. 



Condition. 



Prairie 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



Prairie with young pines. 



...do 



Alfalfa 



....do 



...do 



Winter wheat 



....do 



....do 



....do 



....do 



....do 



Wheat stubble 



....do 



....do 



do 



do 



do 



do 



do 



do 



Rye stubble 



Kafir stubble 



Cornstalks 



do 



do 



do 



do 



do 



do 



do 



do 



Russian thistles 



Milo stubble in orchard . . 



do 



Locust grove 



Orchard 



Fallow 



do 



Hygroscopic 

 coefTicient. 



Ratio. 



i-6in. 7-12 in. i-i2in. 



