. Bulletin. Agriculture; Agriculture -- Arizona. Cultural Experiments 18'5 TABLE XXI Chrysocolla Series (1908) Sample grams No. Appear- Cu ance and in soil, height per cent of plants Dry matter, grams Cu found. Culture Cu p.p.m . in r roots tops Normal 4003 Corn Check* 32 in. 25.60 .00025 10.00 4003c Corn Clieek* 6.46 .00012 19.00 4004 Corn .05 33 23.50 .00026 11.00 4004c Corn .05 6.70 .00062 93.00 Toxic effects begin at about .08% Cu in soil. Dwarfed 4005 Corn .10 30 in. 17.90 .00024 13.00 4005c Corn .10 striped 5.82 ' .00094 162.00 4006 Corn .10 28 in. 10.50 .00017 16.00 4006c Corn 1.00 yell

- Image ID: RH0YBB
Library Book Collection / Alamy Stock Photo
Image ID: RH0YBB
. Bulletin. Agriculture; Agriculture -- Arizona. Cultural Experiments 18'5 TABLE XXI Chrysocolla Series (1908) Sample grams No. Appear- Cu ance and in soil, height per cent of plants Dry matter, grams Cu found. Culture Cu p.p.m . in r roots tops Normal 4003 Corn Check* 32 in. 25.60 .00025 10.00 4003c Corn Clieek* 6.46 .00012 19.00 4004 Corn .05 33 23.50 .00026 11.00 4004c Corn .05 6.70 .00062 93.00 Toxic effects begin at about .08% Cu in soil. Dwarfed 4005 Corn .10 30 in. 17.90 .00024 13.00 4005c Corn .10 striped 5.82 ' .00094 162.00 4006 Corn .10 28 in. 10.50 .00017 16.00 4006c Corn 1.00 yellow 4.29 .00233 543.00 * Containing traces of copper, . 0025%.. Fig. 10.—Corn cultures grown in soils containing copper as silicate (chryso- colla), from none to 1. per cent Cu. ties of Copper Compounds," that precipitated copper carbonate is soluble to the extent of 1.5 parts in 1,000,000 of water, while copper sulphide is soluble to the extent of 0.09 parts of copper in 1,000,000 of water. It is most probable, also, that the finely divided condition of the precipitated carbonate is more favorable to solution, and also to reaction with the acids of plant roots. (2) Corn is seen to be distinctly more sensitive to the car- bonate of copper than either beans or squash. With corn, toxic effects appear with 0.02 per cent of copper in the soil, while with beans and squash these toxic effects do not appear until 0.035 per cent of copper in the soil is reached. As is suggested. 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 work.. University of Arizona. Agricultural Experiment Station. Tucson : Agricultural Experiment Station, University of Arizona