. Bulletin. Agriculture; Agriculture -- Arizona. 204 Bulletin 80 and in feeding capacity. Individual roots are coarse, covered with thick epidermis, and are abruptly angular, apparently as a result of chemotropic contortions. Root tips are shortened and thickened and in some instances are strongly proliferated. The anatomical structures associated with these changes in form are very striking. In corn the cells of the primary cortex, in normal roots, are elongated parallel with the axis of the root, and in longitudinal tangential section measured about 74 by 30 microns. Injured cells of corn gr
. Bulletin. Agriculture; Agriculture -- Arizona. 204 Bulletin 80 and in feeding capacity. Individual roots are coarse, covered with thick epidermis, and are abruptly angular, apparently as a result of chemotropic contortions. Root tips are shortened and thickened and in some instances are strongly proliferated. The anatomical structures associated with these changes in form are very striking. In corn the cells of the primary cortex, in normal roots, are elongated parallel with the axis of the root, and in longitudinal tangential section measured about 74 by 30 microns. Injured cells of corn grown in soil containing per cent copper gave longitudinal tangential sections approximately 34 by 30 microns, as shown on accompanying drawings. (See, also, plates II, III, and U HUn --- )-* u-i >- ~ ^ ^ u a b Fig. 14.—a. Tangential longitudinal section of corn root grown in soil containing .1 per cent of copper as copper sulpliate, showing cells of cortex of injured rootlet, b. Tangential longitudinal section of normal corn root cells of cortex. (X ± 300 diam.) (Sections by G. F. Freeman.) These structural moditications, taken in connection with other symptoms and conditions and in the absence of other causes, such as an excess of alkali salts,** confirm a diagnosis for copper injury in a soil of doubtful toxicity. For instance, March 4. 1916, two sets of samples of barley were collected in the district studied, and the material examined for evidence of copper in- jury, as follows: Lot 1.—Young barley plants from the upper end of a field midway between Safford and Solomonville, under Montezuma Canal. The soil next the ditch shows old tailings, and there are irregular areas of yellow barley immediately under the canal. 9 See Livingston, Botanical Gazette, vol. 30, no. o, p. 229, 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 n
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