THE WILTING COEFFICIENT FOR PLANTS IN ALKALI SOILS. 25 



producing a unit weight of dry matter. The conditions of the experi- 

 ment here described did not allow of accurate determinations of 

 water requirement, but this conclusion seems unavoidable in view 

 of the following facts: (a) Some of the plants in each soil mixture 

 were able to reduce the moisture content to the wilting coefficient. 

 Hence, practically the same total quantity of water was finally lost by 

 transpiration from each soil, (b) The plants in the more strongly 

 saline soils were much smaller when the wilting coefficient was reached 

 than were those in the soils having a lesser salt content. 



Experiments are now in progress to measure the effects of different 

 quantities of alkali upon the water requirement of plants. 



[Cir. 109] 



