0141685 



Table 3*. Interpretive guide for concentrated HC1 soil ex- 

 tractable arsenic 



Soil Depth 

 feet 



As Level 

 ppm 



Interpretation 



0-3 



0-1 

 1-3 



0-1 

 1-3 



0-3 



0-1 

 1-3 



Below 25 ppm 



25-50 ppm 

 Below 2 5 ppm 



25-50 ppm 



50-100 ppm 

 Below 25 ppm 



50-100 ppm 



Above 100 ppm 

 Above 50 ppm 



As is probably not a problem, 



May reduce growth of sensitive 

 trees, such as apricot and 

 peach. Should not seriously 

 affect growth of apple, pear, 

 and cherry. 



Symptoms of As toxicity may 

 appear on apricot and peach 

 during hot summer. Newly 

 planted apple, pear, and cherry 

 may be reduced in growth, but 

 should still grow well. 



Survival of apricot and peach 

 doubtful unless planted with 

 As-free soil. Symptoms of As 

 toxicity should be severe on 

 established apricot and peach. 

 May limit growth of newly 

 planted apple, pear, and 

 cherry. 



Significant reduction in growth 

 of any newly planted trees 

 should be anticipated. Avoid 

 planting stone fruits. 



Hazardous to plant any new trees 

 under these conditions. 



A (Washington State Cooperative Extension Service, 1975). 



85 



