. Auxins and plant growth. Auxin; Plant growth promoting substances. Rooting 205 were more readily utilized than inorganic forms in the promotion of rooting. This is in agreement with previous reports that biotin (Went and Thimann, 1937, p. 239) and adenine (Thimann and Poutasse, 1941) were the most promotive of a variety of nitrogenous materials tested. Van Overbeek et al (1946) found that neither of these com- pounds was as good as arginine. It is entirely possible that the most effective organic form of soluble nitrogen varies from one species of plant to another. Of course nutrient materia
. Auxins and plant growth. Auxin; Plant growth promoting substances. Rooting 205 were more readily utilized than inorganic forms in the promotion of rooting. This is in agreement with previous reports that biotin (Went and Thimann, 1937, p. 239) and adenine (Thimann and Poutasse, 1941) were the most promotive of a variety of nitrogenous materials tested. Van Overbeek et al (1946) found that neither of these com- pounds was as good as arginine. It is entirely possible that the most effective organic form of soluble nitrogen varies from one species of plant to another. Of course nutrient materials are of importance in rooting not only in relation to their ratio with auxin, but also in terms of the amount of substrate present for the actual growth of roots. It is not surprising to find that many workers have correlated ease of rooting with the carbohydrate reserve of a plant. When carbohydrate reserves are abundant, rooting is greatly facilitated (Kraus and Kraybill, 1918; Carlson, 1929). The relative level of soluble nitrogen materials in the cutting also has a bearing on ease of rooting, and the optimum level of these compounds is low in proportion to the carbohydrate 0 I 2 LEAVES PER CUTTING Fig. 88. The effects of leaves present on cuttings of red hibiscus upon some carbohydrate and nitrogen constituents of the cuttings (van Overbeek et al, 1946).. 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
Size: 1550px × 1611px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherberkeleyuniversityofcaliforniapre
