The environmental requirements for adventitious root initiation and growth in 22-day-old blue grama (Bouteloua gracilis) seedlings were determined under controlled temperature and soil moisture conditions. The seminal root was maintained in moist soil; but surface soil (in which adventitious roots may develop) was independently maintained at various degrees of drought. Drought treatments were imposed by controlling the relative humidity of air above the soil and around seedling crowns. In the 100% humidity treatment, elongation rates of the longest root per seedling at temperatures of 15, 20, 25, and 30 degrees C were 0.40, 0.74, 1.04, and 1.22 cm per day, respectively. In the 96% humidity treatment, elongation rates at these temperatures were 0.28, 0.36, 0.38, and 0.44 cm per day, respectively. When the seminal root is growing in moist soil, blue grama seedlings can initiate adventitious roots during severe drought conditions in the surface soil. However, adventitious root growth adequate for seedling establishment will probably not occur at moisture and temperature conditions of less than 96% humidity (-50 bars) and 15 degrees C. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.