HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Agnew, M. L. Articles by Carrow, R. N. Search for Related Content PubMed Articles by Agnew, M. L. Articles by Carrow, R. N. Agricola Articles by Agnew, M. L. Articles by Carrow, R. N.

Soil Compaction and Moisture Stress Preconditioning in Kentucky Bluegrass. II. Stomatal Resistance, Leaf Water Potential, and Canopy Temperature¹

In this greenhouse study we investigated the effects of soil compaction and moisture stress preconditioning on stomatal diffusive resistance (R_s), leaf water potential (₁), and canopy minus air temperatures (T) of Kentucky bluegrass (Poa pratensis L. ‘Ram I’). The compaction treatments were: (i) NC = no compaction, (ii) LT = long-term compaction over a 99-day period, and (iii) ST = short-term compaction for 9 days. The compactive treatment was equivalent to 720 J energy. Irrigation regimes were initiated at the same time as LT compaction and were: (i) well-watered = irrigation at –0.045 MPa and (ii) water-stressed = irrigation at –0.400 MPa. Ninety-nine days after initiation of preconditioning treatments, a dry-down cycle was started by watering each treatment to saturation. At this time, we monitored on a daily basis R_s, ₁, and T. Under low soil O₂, R_s remained low for 2 days and then increased over a 5-day period for all treatments, even though ₁ did not change until the fifth day after irrigation (DAI). By DAI 9, R_s declined but then increased between DAI 10 to 13 as soil water potential (_s) and ₁ decreased. As soil water deficits increased, plants preconditioned to LT compaction or water-stressed exhibited lower ₁ (0.2 to 0.4 MPa), higher R_s, and higher (1 to 2°C) compared with uncompacted or well-watered plants. Regardless of the cause for higher R_s (i.e., low soil O₂, LT compaction or water-stress preconditioning), the result would be lower photosynthesis and greater high-temperature stress.

Key Words: Turfgrass • Poa pratensis L. • Soil water potential • Stomata • Irrigation • Flooding

² Graduate research assistant (presently assistant professor, Dep. of Horticulture, Iowa State Univ., Ames, IA 50011) and associate professor, Dep. of Horticulture, Kansas State Univ., Manhattan, KS 66506 (presently associate professor, Dep. of Agronomy, Univ. of Georgia, Experiment, GA 30212.

Received for publication October 9, 1984.

This article has been cited by other articles:

				R. C. Shearman Fifty Years of Splendor in the Grass Crop Sci., September 8, 2006; 46(5): 2218 - 2229. [Abstract] [Full Text] [PDF]