Author:
An M.,Pratley J. E.,Haig T.,Jellett P.
Abstract
Summary. The germination and seedling growth of 12 plant
species and 12 cultivars from 2 plant species were tested in the presence of
aqueous extracts of vulpia dry matter residues. Concepts of whole-range
assessment and inhibition index were developed, and used, with principal
component analysis, for assessing results. Species were grouped according to
the inhibition index. Average threshold concentration, average
I50 (the extract concentration required to cause
50% inhibition in plant response) and average root and coleoptile
lengths were used as auxillary indices for each group. Marked differences in
tolerance toward the phytotoxicity of vulpia residue extracts were observed
among species and cultivars. Such differences were widespread among plant
species, with generally cocksfoot, Vulpia spp.,
subterranean clover (cv. Trikkala), phalaris, canola, medics, and oats being
relatively tolerant, while lupins, barley, and wheat (cvv. Janz, Vulcan) were
the most susceptible, and subterranean clover (cvv. Seaton Park, Karridale,
Clare, Woogenellup, Junee), field peas, and wheat (cvv. Ford, Darter,
Dollarbird, Rosella) were relatively susceptible. The findings of this study
suggest that choice of species and cultivar may be a valuable management
option for minimising the negative effects of vulpia residues. The whole-range
assessment developed in this study proved to be a statistically efficient
summary of the plant response profiles. Together with the bioassay techniques
adopted, it provides a simple and rapid screening methodology for assessing
the relative tolerance of plant species to the allelopathic effects of weed
residues.
Subject
General Agricultural and Biological Sciences
Cited by
17 articles.
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