1917] Forbes: Irrigation Effects of Copper Compounds Upon Crops 441 



TABLE XXVI 



Copper in Soils, and in Eoots of Plants Grown in Field Soils Contain- 

 ing Mining Detritus, near Solomonville and Safford (1914) 



Dry Cu Cu p. p.m. in 



matter, found, , -^ .> 



Jan. 3, 1909 grams grams tops roots 



4008a Barley tops selected for toxic 

 effects from tailings soil (Win. 

 Gillesi^ie), Solomonville, under 

 Montezuma Canal 13.90 .00061 43.80 



4008b Barley roots, ditto 2.70 .00160 592.50 



4009rt Oat tops selected for toxic effects 

 from field one mile west of Solo- 

 monville, under Montezuma Canal 28.30 .00121 42.70 



4009& Oat roots, ditto 2.55 .00025 98.00 



Per cent 

 Dr'' Cu Cu p. p.m. Cu in soils 



matter, found, , -^ ^ shaken 



March, 1914 grams grams yellow green from roots 



5544a Barley roots, yellow plants.. 3.78 .00037 98 .017 



5545a Barley roots, green plants .... 2.33 .00290 124 .006 



5546a Barley roots, yellow plants .. 3.41 lost 



5547a Barley roots, green plants .... 3.80 .00047 123 



5548a Wheat roots, yellow plants .... 1.40 .00044 314 .054 



5549a Wheat roots, green plants 1.25 .00048 382 .014 



5550a Barley roots, less green 



plants 2.17 .00077 354 



5551a Barley roots, stronger plants 3.34 .00110 329 



5552a Oat roots, yellow plants 1.67 .00066 .394 .050 



5553a Oat roots, green plants 1.77 .00030 169 .039 



5554a Barley roots, yellow plants.. 1.38 .00057 411 .073 



5555a Barley roots, green plants .... 1.42 .00041 289 .032 



Average 314 236 .048 .023 



4010 Corn roots (1908) in tailings 



soil, Solomonville 16.12 .00097 60 



November, 1914 



5841a Corn roots, tailings 9 in. deep 10.18 .00021 21 



5842a Corn roots, tailings 8 in. deep 11.08 .00038 34 



5843a Corn roots, old tailings 10.01 .00038 38 .055 



5844a Corn roots, tailings 6-12 in. 



deep 21.48 .00039 18 



5845a Corn roots, old tailings 16.24 .00068 42 



5846a Corn roots, old tailings 5.02 .000.34 68 .105 



5847a Corn roots, old tailings 14.42 .00104 72 .040 



Average 42 



