Influence of fall nitrogenous fertilization on the carbohydrates of Kentucky bluegrass1
- D. T. Duff
Ten grams of nitrogen per square meter were applied October 1 and 15, November 1 and 15, December 1 and 15 to separate plots. Sample tissue was removed from the plots at 2-week intervals throughout the autumn, winter, and spring. Basal culm, lower leaf sheath, and apical meristem tissue were analyzed for carbohydrate content after extraction with a graded ethanol-water series.
There was a rapid increase in all soluble carbohydrate components studied during November, the period of hardening in Rhode Island, followed by a more gradual increase during winter. The levels of total long-chain and short-chain carbohydrates found appeared to be adequate for energy to support new growth at the end of the dormant season regardless of the time of N application the previous autumn. The levels of short-chain polymers were little effected by N treatments. The amount of long-chain polymers may account for reduced cold tolerance caused by fall nitrogen application found in a companion study. Additional index words: Carbohydrate polymers, Cold tolerance, Acclimation, Poa pratensis.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1974. . Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA