. Certain effects under irrigation of copper compounds upon crops. Plants; Copper solutions, Physiological effect of. 1917] Forbes: Irrigation Effects of Copper Compounds Upon Crops 437 in the following pages, the physical constitution of root systems may account in part for varying degrees of sensitiveness to cop- per compounds. The presence of copper in tops and roots of check is due to per cent of copper in the soil which was supposed orig- inally to be free from this element. Pot Cultures with Field Soils Two field soils containing copper from irrigating waters were tested in pot cu
. Certain effects under irrigation of copper compounds upon crops. Plants; Copper solutions, Physiological effect of. 1917] Forbes: Irrigation Effects of Copper Compounds Upon Crops 437 in the following pages, the physical constitution of root systems may account in part for varying degrees of sensitiveness to cop- per compounds. The presence of copper in tops and roots of check is due to per cent of copper in the soil which was supposed orig- inally to be free from this element. Pot Cultures with Field Soils Two field soils containing copper from irrigating waters were tested in pot culture with reference to toxic effects and. Fig. 11.—Pot cultures of coin in field soils containing tailings. No. 3887, .027% Cu; no. 3888, .047% Cu; and no copper. Cultures in field soils are slightly affected. copper content of root systems. The soils employed were from a field showing varying effects of accumulations of tailings, im- mediately southeast of Safford: Cu in soil, Sample per cent 3887 Sandy loam, surface 12 in. of soil recently put under irri- gation 027 3888 Heavy clay (tailings) mixed with sandy loam, surface 12 in., long under irrigation, much tailings 047 In these two soils, differing mainly through the addition of tailings to No. 3888, cultures of corn, beans, and squash were made, and examined for copper with the following results:. 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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