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This article in AJ

  1. Vol. 61 No. 5, p. 655-659
     
    Received: July 24, 1968
    Published: Sept, 1969


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doi:10.2134/agronj1969.00021962006100050001x

Response of ‘Tifgreen’ Bermudagrass and ‘Windsor’ Kentucky Bluegrass to Various Light Spectra Modifications1

  1. G. R. McVey and
  2. E. W. Mayer2

Abstract

Abstract

Windsor Kentucky bluegrass (Poa pratensis, L. ‘Windsor’) and Tifgreen bermudagrass (Cynodon dactylon, L. ‘Tifgreen’) were grown under transparent, acrylic plastic panels during the summermonths (June 1 to oct. 1, 1966) under outdoor conditions. Various acrylic plastic units were selected with the transmittance in the blue (410.510 mµ) ranging from 18 to 74% of full sunlight and in the grey (390-760 mµ) ranging from 15 71% of full sunlight.

Turfgrass color and quality (aesthetic value) were increased and clipping length and fresh weight removal reduced when bluegrass and bermudagrass were exposed to blue light as compared to grey light, at comparable light transmittance levels. These differences were more striking at the lower light intensities (less than 60% transmittance).

Seedhead formation of bermudagrass was stimulated when the grass was grown under blue-tinted acrylic plastic and suppressed when grown under grey-tinted acrylic plastic.

The degree of injury (as reflected by turf density) was not markedly altered by light quality except at very low light intensities. Bermudagrass was severely injured when grown under grey-tinted acrylic plastic with less than 20% transmittance while turf grown under bine-tinted acryfic plastic at low light intensities was only slightly injured.

The minimum light quantity for acceptable turf quality of Tifgreen bermudagrass and Windsor Kentucky bluegrass should exceed 40 to 50% transmittance of the full sunlight if the turf is grown in blue transmitted sunlight or 60 to 70% transmittance if grown in grey transmitted sunlight.

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