Sept. 9.1918 Variations in Moisture Content of a Loess Soil 
477 
more important than the second, although the depth of the plowline has 
little to do with the matter. 
fiRASS FIELD. I TALLOW 1 EX POSED SUBSOIL 
3. On Junet 
After a O.S inch.shower. 
6. OnAuq S>6 After 1.30 inch of rain. 
-LEGEND- 
Moisture below hygroscopic coefficient. 
Moisture between hygroscopic coefficient and wilting coefficient. 
Me isture shove w i (ting coeffic i«nt. 
H.C •Hygroscopiccoefficient(1.00). Moisture equivalentC2.7|)-W-C«WiIt?i*ig coefficient(1.47) 
Fig. 5. —Diagram showing ratio of moisture content to hygroscopic coefficient in the surface foot of soil 
on three adjacent areas at the Nebraska Agricultural Experiment Station during the season of 191a. 
The data illustrate also the relation of the distribution of moisture to both the plant cover and the pre¬ 
ceding weather. 
Where the availability of the phosphoric acid and potash in the lower 
levels is distinctly less than in the plowed layer, the above remarks re¬ 
garding the mineral nutrients would not apply, but with the loess soils 
here discussed no such difference in availability has been found (5, p. 21 ). 
