SALINITY OF IRRIGATION WATER — SCOFIELD 287 



A, fruit trees; B, vines and cereals; C- vegetables. The concentra- 

 tion of total salinity is considered in connection with boron and 

 sodium percentage. If all three rate class 3 or higher, the water is 

 unsuitable. In general if the water rates class 4 for any two or 

 more characteristics, it is classed as unsuitable. 



It should be understood that class limits or standards given in the 

 table are intended for use in a particular area and should not be 

 taken as applicable everywhere. It should be clear that it is not 

 practicable to use one set of standards for all irrigation waters or 

 for all sorts of crops, or for all sorts of soil and climatic conditions. 

 Another error to be avoided is that of adopting a single criterion 

 such as total salinity or the chloride content. Such simplification is 

 not warranted by the facts in the case. 



