. Auxins and plant growth. Auxin; Plant growth promoting substances. Application and Persistence 197 inhibitors (Audus, 1951) and consequently the protective effect ap- pears to be due to the prevention of auxin from outside the root zone entering into contact with the root. The effectiveness of activated (arbon as an ads(M|)ti\e agent to remove residues from spray ecjuipment has been demonstrated by Lucas and Hamner (1947). Leaching. The second major factor in the persistence of auxins in soils is that of leaching. Obviously the ease with which a material can be leached from a soil will be st
. Auxins and plant growth. Auxin; Plant growth promoting substances. Application and Persistence 197 inhibitors (Audus, 1951) and consequently the protective effect ap- pears to be due to the prevention of auxin from outside the root zone entering into contact with the root. The effectiveness of activated (arbon as an ads(M|)ti\e agent to remove residues from spray ecjuipment has been demonstrated by Lucas and Hamner (1947). Leaching. The second major factor in the persistence of auxins in soils is that of leaching. Obviously the ease with which a material can be leached from a soil will be strongly influenced by adsorption, as we have discussed in the previous paragraphs, and the adsorptive properties will vary with soil type. Besides adsorption, the solubility of the auxin will play a role here. Early observations indicated that liming or an excessively calcareous condition would retard leaching of auxins (Kries, 1946; Muzik et al, 1951). This would presumably be accounted for on the basis of the formation of auxin salts such as the calcium salt which are relatively insoluble. Other reports have failed in several instances to confirm that liming or calcareous conditions retarded leaching (Hanks, 1946; Akamine, 1951), but the experiment- ers have seldom distinguished between adsorption and leaching IS Inches AMOUNT OF LEACHING WATER Fig. 82. The relative rates of leaching of 2,4-D from the surfaces of three dif- ferent soils by various amounts of leaching water. The amount of 2,4-D remaining was quantitatively estimated by the inhibition of grabgrass seedlings (Ogle, 1953).. 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 Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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