PLATE 11 



Fig. 1. From right to left, cylinders 1 and 2 maintained at 22 per cent of 

 soil moisture, cylinders 3, 4, and 5 at 24 per cent of soil moisture, cylinders 6 and 

 7 at 26 per cent of soil moisture. 



Fig. 2. From right to left, cylinder 1 at 26 per cent of soil moisture, cylinders 

 2, 3, and 4 at 28 per cent of soil moisture, cylinders 5, 6, and 7 at 30 per cent of 

 soil moisture. 



[36] 



