. Bulletin. Agriculture; Agriculture -- Arizona. Cultural Experiments 183 Copper Carbonate Series (1908), Corn Sample No. Culture Cu in soil, per cent Appear- ance and height of plants Normal Dry matter, grams Cu found, grams Cu roots 3992 Corn Check* 43 in. .00058 3993 Corn .01 41 .00049 3994 Corn .015 35 .00171 3995 Corn .02 41 .00397 Toxic effects begin at about .023% Cu in soil Stunted 3996 Corn .025 33 in. .00245 3997 Corn .05 15 .31 .00023 3998 Corn .10 22 .00651 4000 Corn .20 20 .00444 * C
. Bulletin. Agriculture; Agriculture -- Arizona. Cultural Experiments 183 Copper Carbonate Series (1908), Corn Sample No. Culture Cu in soil, per cent Appear- ance and height of plants Normal Dry matter, grams Cu found, grams Cu roots 3992 Corn Check* 43 in. .00058 3993 Corn .01 41 .00049 3994 Corn .015 35 .00171 3995 Corn .02 41 .00397 Toxic effects begin at about .023% Cu in soil Stunted 3996 Corn .025 33 in. .00245 3997 Corn .05 15 .31 .00023 3998 Corn .10 22 .00651 4000 Corn .20 20 .00444 * Containing traces of copper, .0025%. Copper Carbonate Series (1908), Squash Sample No. Culture Appear- Cu ance and Dry in soil, height matter, per cent of plants grams Cu found, grams Cu A m. in tops roots Normal 3937 Squash Check* 16 in. .00016 3938 Squash .01 16 .00023 3939 Squasli .025 15 .00031 • 4026 Squash Chk., .01, and .025 .24 .00004 Toxic effects begin at about .035% Cu in Blanched and stunted soil. 3940 Squash .05 11 in. .00017 3941 Squash .10 11 .00014 Fig. 9.—Corn cultures grown in soils containing copper as sulphide (chalco- cite), from none to 1. per cent Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Arizona. Agricultural Experiment Station. Tucson : Agricultural Experiment Station, University of Arizona
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