Dugald C. Close

ORCID: 0000-0001-7999-1692
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About
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Research Areas
  • Horticultural and Viticultural Research
  • Plant Physiology and Cultivation Studies
  • Fermentation and Sensory Analysis
  • Plant Water Relations and Carbon Dynamics
  • Seedling growth and survival studies
  • Ecology and Vegetation Dynamics Studies
  • Forest ecology and management
  • Growth and nutrition in plants
  • Postharvest Quality and Shelf Life Management
  • Phytochemicals and Antioxidant Activities
  • Wine Industry and Tourism
  • Fire effects on ecosystems
  • Tree Root and Stability Studies
  • Plant responses to elevated CO2
  • Soil Carbon and Nitrogen Dynamics
  • Agroforestry and silvopastoral systems
  • Plant and animal studies
  • Plant Reproductive Biology
  • Banana Cultivation and Research
  • Forest Ecology and Biodiversity Studies
  • Photosynthetic Processes and Mechanisms
  • Rangeland and Wildlife Management
  • Fern and Epiphyte Biology
  • Irrigation Practices and Water Management
  • Berry genetics and cultivation research

University of Tasmania
2016-2025

Tasmanian Institute of Agriculture
2010-2021

Tasmanian Land Conservancy
2018-2021

Natural Hazards Research Australia
2006-2015

Origin Energy (Australia)
2012

Botanic Gardens and Parks Authority
2005-2009

The University of Western Australia
2005-2009

Murdoch University
2006-2009

Forestry Research Centre
2009

Forestry Tasmania
2000-2008

Phenolics have been considered classic defence compounds for protecting plants from herbivores, ever since plant secondary metabolites were suggested to evolved that reason. The resource availability and carbon‐nutrient balance hypotheses proposed variation in phenolic levels between within species reflects environmental of nutrients light, represents a trade‐off allocation by growth against herbivores. In contrast these concepts, we suggest (1) the main role many phenolics may be protect...

10.1034/j.1600-0706.2002.990117.x article EN Oikos 2002-10-01

10.1663/0006-8101(2003)069[0149:teofa]2.0.co;2 article EN The Botanical Review 2003-04-01

Extraction and stabilization of wine phenolics can be challenging for makers. This study examined how yeast choice affected phenolic outcomes in Pinot noir wine. Five treatments were applied replicated microvinification, wines analyzed by UV-visible spectrophotometry. At bottling, treatment Saccharomyces cerevisiae RC212 had significantly higher concentrations total pigment, free anthocyanin, nonbleachable tannin showed high color density. Some effects retained at 6 months' bottle age, S....

10.1021/jf4018806 article EN Journal of Agricultural and Food Chemistry 2013-09-07

Summary The results of site assessment and information survey 13 plantings established between 1995 2000 from the Tasmanian Midlands Derwent Valley Lowlands are presented. Establishment success tubestock ranged 2 to 100% that direct seeding 860 20 000 seedlings/ha. Successful establishment was associated with first year watering good rains, respectively. Browsing damage evident in seeded plots eucalypts most affected acacias She‐oak ( Allocasuarina verticillata ) least affected. Treeguards...

10.1046/j.1442-8903.2003.00135.x article EN Ecological Management & Restoration 2003-03-07

Abstract Precise crop fertilization requires an in-depth understanding of plant uptake and utilisation to optimise sustainable production. This study investigated the influence nitrogen (N) nutrition pruning on cannabinoid concentrations biomass a commercial cannabis cultivar; rationale for this is how N supply affect yields concentration in setting. Clones Cannabis sativa L. (CBD-type) were grown controlled-environment glasshouse pots with coarse sand. After five weeks vegetative growth...

10.1038/s41598-023-46369-5 article EN cc-by Scientific Reports 2023-11-09

The chemical profile, physico-chemical properties and antioxidant activity leatherwood honey samples from 2015 - 2021 were characterised related to seasonal variation. Parameters included the total electrical conductivity, pH, colour, water content, phenolic ferric ion reducing power ascorbic acid equivalent capacity. Differences in profile according production year identified by PCA analysis showing three separate clusters for 2015, 2016 2019 one common cluster 2017 2018. All analysed...

10.2139/ssrn.5093619 preprint EN 2025-01-01

Nitrogen (N) nutrition and germplasm of clones can influence biomass cannabinoid concentration in medicinal cannabis. However, there are discrepancies on the optimal nitrogen application rate at flowering stage to achieve maximum yield if, or how, this interacts with from different seed lines same genotype. This research examined relationship between N rate, cannabinoids a CBD-type cannabis cultivar propagated five (hereafter referred as clones). Clonal rooted cuttings were mother plants...

10.1038/s41598-025-96761-6 article EN cc-by-nc-nd Scientific Reports 2025-04-10

Leaves of Eucalyptus nitens (Deane & Maiden) Maidenwere sampled during establishment seedlings that were deprived nutrientsor fertilised at planting. Extracts analysed for polyphenolic compoundsusing high pressure liquid chromatography (HPLC) in conjunction with UV diodearray and electrospray ionisation mass spectrometry (ESI-MS) negative iondetection as well direct MS injection. The presence quercetin, rutin,sideroxylonal A B andpenta-galloylglucose confirmed by comparison standards....

10.1071/pp00112 article EN Functional Plant Biology 2001-01-01

We investigated effects of light and nutrients on whole plant growth, ecophysiology, leaf chemistry Eucalyptus nitens seedlings, the effect these characteristics herbivory by common brushtail possums (Trichosurus vulpecula) red-bellied pademelons (Thylogale billardierii). compared results response secondary to changes in environmental conditions against two contrasting hypotheses: (1) carbon:nutrient balance hypothesis (CNBH) (2) photoinhibition hypothesis. Nutrient levels affected relative...

10.1890/02-0531 article EN Ecology 2003-11-01

The variation in well performance observed between various shale gas plays, and indeed within individual basins on pads, has gone some way to dispelling myths regarding the perceived homogeneity of “shale gas” targets. With increased quantities data more determined analysis, we show that understanding micro- mesoscale heterogeneity can be advanced through interdisciplinary studies incorporate traditional geophysical methods with geological engineering measurements. This is critical...

10.1190/tle31050556.1 article EN The Leading Edge 2012-05-01

Nutrient leaching from agricultural soils is a worldwide problem that has been implicated in deleterious impacts on the environment. Application of biochar to soil proposed as means reduce nutrient and improve fertilizer use efficiency. The potential for increase efficiency was tested by applying 47 Mg ha hardwood before replanting commercial apple () orchard, Huon Valley, Tasmania. Passive wick flux meters were installed at base A1 horizon depth 25 cm monitor leachate volume concentration...

10.2134/jeq2015.02.0068 article EN Journal of Environmental Quality 2015-07-01
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