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This article in AJ

  1. Vol. 83 No. 5, p. 800-803
     
    Received: July 25, 1990
    Published: Sept, 1991


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doi:10.2134/agronj1991.00021962008300050005x

Estimating Turf Biomass, Tiller Density, and Species Composition by Coring

  1. W. M. Lush  and
  2. P. R. Franz
  1. B otany School, Univ. of Melbourne, Parkville 3052, Australia
    D ep. of Agriculture and Rural Affairs (DARA), Biometrics Unit, 176 Wellington Parade, East Melbourne 3002

Abstract

Abstract

The methodology for estimating tiller density, turf biomass, arid species composition by core sampling was examined in order to 6 stablisb an objective, quantitative protocol for measuring tud lesponses to management and for comparing genotypes. Cores we recollected from a finie-tex hued creeping bentgrass (Agrostis stolorrifera L.) turf and an intermediate-textured turf composed of Kentuc ky bluegrass (Poa pratensis L.), ryegrass (Lolium perenne L.) and annual bluegrass (P. annum L.). Estimates based on different sampling tools, one rectangular aind three round, and different methods of storing cores between collection in the field and processing in the laboratory were examined. It is concluded that the numbers of COI es needed to estimate, at a specified level of accuracy, the biomass and tiller density of a turf (or of the most frequently occurring species in a turf) are low enough (e.g. eight to 43 cores of 4.8-cm diam.) lor coring to be a practical way of quantifying the standing vegetation of turfs. Coring is not a good method for estimating infrequently occumng species because of the large numbers of cores required, in this case around 3000. Estimates of tiller density or biomass were iased in cores with a long perimeter relative to their cross-sectionial area by soil entrapment (especially if free water accumulated during storage), and in cores that became desiccated during storage.

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