. Certain effects under irrigation of copper compounds upon crops. Plants; Copper solutions, Physiological effect of. 43(5 University of California Publications in Agricultural Sciences [Vol. 1 TABLE XXI Chrysocolla Series (1908) Sample Culture Appear- Cu anee and in soil, height per cent of plants Dry matter, grams Cu found, grams Cu in A No. tops roots Normal 4003 Corn Check* 32 in. .00025 4003c Corn Cheek .00012 4004 Corn .05 33 .00026 4004c Corn .05 .00062 Toxic effects begin at about .08% Cu in soil. Dwarfed 11 ;, Corn .10 30 in
. Certain effects under irrigation of copper compounds upon crops. Plants; Copper solutions, Physiological effect of. 43(5 University of California Publications in Agricultural Sciences [Vol. 1 TABLE XXI Chrysocolla Series (1908) Sample Culture Appear- Cu anee and in soil, height per cent of plants Dry matter, grams Cu found, grams Cu in A No. tops roots Normal 4003 Corn Check* 32 in. .00025 4003c Corn Cheek .00012 4004 Corn .05 33 .00026 4004c Corn .05 .00062 Toxic effects begin at about .08% Cu in soil. Dwarfed 11 ;, Corn .10 30 in. .00024 4005c Corn .10 striped .00094 400(3 Corn .10 28 in. .00017 4006c Corn yellow .00233 Containing traces of copper, .0025%.. Pig. K). ('din cultures grown in soils containing copper as silicate (chryso- colla), from none to 1. per cent Cu. tics of Copper Compounds," that precipitated copper carbonate is soluble to the extent of parts in 1,000,000 of water, while copper sulphide is soluble to the extent of 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 per cent of copper in the soil, while with beans and squash these toxic effects do not appear until :5;") 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 Forbes, Robert Humphrey, 1867-1968. Berkeley, University of California Press
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