PAPERS BY MEMBERS 



97 



Fig. 3. Graphs shuwing soil moisture at station 1. a: 

 of soil at the 7.1 cm. depth, b: of soil at the 25 cm. depth, c: 

 wilting coefficient for the former and d for the latter soil. 

 Weekh' rain-fall in cm. shown at base of figure. 



Tt will be noted from the graphs that the soil held large 

 amounts of water until late in May when the content fell off 

 rapidly during the rest of the month. This fall coincides with 

 the high rate of evaporation already discussed for May. The 

 general high water contents are at or near the saturation 

 point, and this condition prevails inMay, just before the grow- 

 ing season begins, and again in October after it has closed. 

 In the summer months of July and August the moisture is 

 uniformly low. giving a mean for those months of 24 per cent. 

 There are times during these months that the water content 

 of the soils at the two depths falls below the critical per- 

 centage. This is shown for example by the surface soil at 

 station 1 (fig. 3) in Tulv and August and by the deeper layer 



