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Kristiansen, Paul
- PublicationWhat factors influence women’s participation in co-management? A case study of Sundarban mangrove forest management in Bangladesh
Understanding what factors influence women's participation in forest co-management is vital for effective policy planning and women's empowerment. The views of women and men from four villages in the Chandpai forest range on what influences women's participation in forest co-management were gathered qualitatively. Data were collected through focus group discussions (n ¼ 16) and in-depth interviews with key informants(n ¼ 29), and thematically analyzed. The participation of women in forest co-management was mostly influenced by family expectations, then religious and societal norms. Women stated that these expectations constrained their participation, whereas men suggested it was less influential. Men reported that women's participation was motivated by a sense of responsibility to protect the forest, while women reported that participation was mainly focused on economic security for the family. Activities to increase women's participation could include training (e.g. forest protection, leadership), awareness campaigns regarding women's roles, and gender-balanced involvement in household activities.
- PublicationThe Effects of Temperature and Soil Moisture on Chickpea ('Cicer arietinum L.') Genotype Sensitivity to Isoxaflutole(Wiley-Blackwell Verlag GmbH, 2009)
;Datta, A; ; ; Felton, WLIsoxaflutole at 75 g ai ha⁻¹ is registered in Australia for the control of several broadleaf weeds in chickpea ('Cicer arietinum L.'). Although isoxaflutole provides satisfactory control of problematic weeds, under certain conditions crop injury can occur. Higher air temperature and moisture content of soil are reported to affect the metabolism of soil applied herbicide. Controlled environment experiments were used to determine the tolerance of chickpea to isoxaflutole under a range of temperature and soil moisture levels. For the soil moisture study, the variables examined were two desi chickpea genotypes (Kyabra as a tolerant cultivar and Yorker as a sensitive cultivar), three soil moisture levels [50 % field capacity (FC), 75 % FC and FC] with three herbicide rates [0, 75 (recommended rate) and 300 g ai ha⁻¹]. For the temperature by soil moisture study, the variables examined were two other desi chickpea genotypes (97039-1275 as a tolerant line and 91025-3021 as a sensitive line), three temperature regimes (20/5, 30/15 and 35/25 °C), two soil moisture conditions (50 % FC and FC) with the same three herbicide rates. The results demonstrated that the chickpea genotypes exhibited differential tolerance to isoxaflutole, but that differences in response were affected by rate, temperature and soil moisture. Increasing temperature and soil moisture content made the susceptible chickpea genotype more vulnerable to isoxaflutole damage. Injury to the susceptible genotype in terms of increased leaf chlorosis and reduction in shoot height and dry matter production increased as soil moisture increased from 50 % FC to FC and temperature increased from 20/5 to 35/25 °C. Overall damage of the sensitive genotype from increasing rates of isoxaflutole also increased when soil moisture content increased from 50 % FC to FC within the fixed temperature regime of 30/15 °C. The sensitivity of chickpea to isoxaflutole depends on existing temperature and moisture content and the chances of crop damage were enhanced with increasing temperature and moisture levels. - PublicationEffective Integrated Weed Management - Case Study: Managing weed seed banks through stale seed beds and inter-row cultivation: Schreurs & Sons, Clyde, Victoria(University of New England, 2020-03)
; ; ; ; Horticulture Innovation Australia LimitedThe Schreurs family have been growing vegetables in the Cranbourne district, approximately 50 km south-east of Melbourne, since the 1950s. Originally renowned for introducing Dutch carrots into the Australian market, Schreurs & Sons has now diversified into growing a variety of vegetable crops. Today, Schreurs & Sons own five farms in the outer Melbourne suburbs of Clyde and Devon Meadows, totalling approximately 550 hectares. Across these farms, approximately 400 hectares are dedicated to vegetable production. The business employs about 180 staff, rotating across the five farm sites depending on need for ground preparation, planting and sowing, crop management, and harvest activities. - PublicationDwarf Nettle (Urtica urens): Weed management guide for Australian vegetable production(University of New England, 2018-09)
; ; ; ; Horticulture Innovation Australia LimitedDwarf nettle (Urtica urens) is an annual herbaceous plant, native to Mediterranean Europe, that grows between 10 and 75 cm in height. Figure 1 Life stages, from germination to floweringLeaves are up to 6 cm in length but often 1-3 cm, oval to elliptical in shape, deeply toothed or serrated on the edges, green to dark green, and covered with scattered stinging hairs. Clusters of small, greenish-white flowers form where the leaves join the stems.Dwarf nettle is also known in Australia as small nettle, lesser nettle, or stinging nettle. Vegetable farmers are likely to be very familiar with it where it is found on their farm, and to be well aware of how to identify it. However depending on its stage of growth, it may be possible to mis-identify it as tall nettle (Urtica dioica), native scrub nettle (Urtica incisa) or potentially deadnettle (Lamium amplexicaule), particularly where the plants are recently germinated. - PublicationInteractions of temperature and water potential in displacement of 'Fusarium pseudograminearum' from cereal residues by fungal antagonists'Fusarium pseudograminearum' (Fp) is a stubble-borne fungus that causes crown rot in wheat and barley. Displacement of 'Fp' from stubble by other fungi was explored. Fungi were isolated from field collections of stubble and identified using morphological and molecular methods. The most abundant species were 'Alternaria' sp., Sterile sp. 1 and 'Fp'. Representative isolates of all species were screened in dual culture with 'Fp' to select candidates for detailed experiments on displacement. 'Trichoderma harzianum (Th), Alternaria infectoria (Ai), Fusarium equiseti (Fe) and Fusarium nygamai (Fn)' were chosen as representing the range of interaction types found. The effects of temperature (5–35 °C) and water potential (-0.3 to -5 MPa) on growth rates, displacement of 'Fp' from infested barley straw and dual culture interaction with Fp were determined. Th was the strongest antagonist overall, but displaced 'Fp' very poorly at the lowest temperatures and water potentials. It was more antagonistic than expected from effects on growth at high temperature and less antagonistic than expected at low temperature. 'Fe' and 'Fn' showed consistent mutual antagonism with 'Fp' on contact in dual culture and gave moderate displacement of 'Fp' from straw, with 'Fe' being the most effective antagonist under cool dry conditions. 'Ai' gave very poor displacement of 'Fp' from straw, despite being the most common straw fungus, confirming that displacement was due to antagonism and not just the presence of other fungi. The type of interaction in dual culture was consistent with degree of displacement from straw and could be used to indicate which environmental conditions were most limiting for an antagonist. The ability to displace 'Fp' under cool dry conditions appears to be critical.
- PublicationEcological studies of 'Hyparrhenia hirta' (L.) Stapf in northern New South Wales(2009)
;Chejara, Vinod Kumar; ; ; ;Nadolny, ChristopherKriticos, Darren'Hyparrhenia hirta' (L.) Stapf (Coolatai grass) is a summer active, C4 perennial grass, native to southern Africa and the Mediterranean region. In recent years its range has expanded rapidly and there are now populations of H. hirta in all states and Territories of Australia except Tasmania. It invades native grassy and open woodland communities, including roadsides and travelling stock routes, national parks and pastures. There is little published information on the biology and ecology of 'H. hirta' in the summer rainfall environment of northern New South Wales. This study aimed to increase our understanding of key aspects of the ecophysiology, population dynamics and community ecology of 'H. hirta' to assist in control and management. - PublicationChanges in Vertisol properties as affected by organic amendments application rates(Wiley-Blackwell Publishing Ltd, 2011)
;Ghosh, Subhadip; ; ; ;King, Kathleen LThere is considerable global interest in using recycled organic materials because of perceived benefits to soil health and environment. However, information on the effects of organic waste products and their optimal application rates on the quality of heavy clay soils such as Vertisols is sparse. An incubation experiment was therefore conducted using five organic amendments at various rates to identify their optimal application rates, which could improve the quality of the Vertisol. Cotton gin trash, cattle manure, biosolids (dry weight basis 7.5-120 t/ha), chicken manure (dry weight basis 2.25-36 t/ha) and a liquefied vermicast (60-960 L/ha, volumetric basis) changed the soil chemical, physical and microbiological properties compared with a control where no amendments were applied, viz. higher light fraction of organic matter, nutrient content (N and P) and soil microbial activity. Higher application of chicken manure resulted in an increase in dry-sieved mean weight diameter. Increasing rates of cattle manure increased exchangeable Na concentration and ESP. Although vermicast itself did not contribute a significant amount of N into the soil, when applied at higher rates (60-960 L/ha), its application resulted in increased concentration of NO₃-N in soil by amounts ranging from 43 to 429%. Optimal application rates for cattle manure and cotton gin trash were 30 t/ha, whereas for biosolids and chicken manure, the optimum rate was 60-18 t/ha, respectively. - PublicationPasture Species as an Option for Soil Organic Carbon Sequestration to Restore Abandoned Croplands in Nepal(University of New England, 2022-08-02)
; ; ; Atreya, KishorCropland abandonment is a human-induced land use change that is emerging globally in the last century. The rate of cropland abandonment is increasing in Nepal in the last decade, impacting soil functions and productivity. Restoration options have been actively sought by land managers and policymakers, and the potential of pasture establishment has been seen as a potential option to maintain soil quality while also providing a productive base for landholders. Following abandonment, changes in geomorphology and secondary vegetation succession can have a significant impact on soil organic carbon (SOC). Few studies have been conducted in Nepal to understand the impact and restoration of post-abandonment land. In this work, abandoned croplands, forest, pasture, and existing cropped land were examined in Gorkha and Kavre districts of Nepal with the aim of understanding the impacts of cropland abandonment by measuring the change in SOC across soil depths. A field experiment was undertaken in Gorkha district of Nepal where four pasture species were grown in a prior cropland abandoned for 2 years, in order to understand the potential of pasture species for carbon (C) sequestration. To explore the mechanism of SOC formation by pasture roots, a greenhouse experiment at University of New England, Australia was also conducted in which four pasture species were grown in two contrasting soil types (Ferrosol and Chromosol). Abandoned cropland in Nepal subject to secondary vegetation succession had accumulated significant amounts of SOC, particularly the labile fraction (particulate organic carbon), compared with existing cropland, especially after 10 years of abandonment and that SOC values were on the trajectory towards those of forest and pasture. Around 23% of SOC has been recovered with secondary succession in more than 10 years abandoned cropland compared to the currently cropped land. Pasture establishment on abandoned cropland increased the SOC in which the labile carbon increased in the top-soil (0-20 cm) and stable carbon in sub-soil (20-40 cm). Pasture roots contribute to form new carbon through dissolved organic carbon formation and root exudation that is mostly fixed on the stable SOC fractions (mineral-associated organic carbon) in both Chromosol and Ferrosol. It is concluded that vegetation cover in abandoned cropland increased labile carbon in the surface soil which had been preferentially lost in the early years of abandonment. With the pasture establishment on abandoned cropland, SOC can be stabilised in sub-soil with the higher fixation of new carbon in the mineral soil matrix. So, we recommend that land managers and policymakers integrate a pasture component in abandoned cropland restoration program that has ability to restore abandoned cropland through increased SOC.
- PublicationMarshmallow (Malva parviflora): Weed management guide for Australian vegetable production(University of New England, 2019-08)
; ; ; ; Horticulture Innovation Australia LimitedMarshmallow (also sometimes called ‘small-flowered mallow’ or ‘little mallow’) is an annual sprawling herb, native to the Mediterranean region, with a single long taproot. It can grow up to 1.2 m in height and 2.1 m in width.The plant is woody at the base. Leaves are dull dark green and surrounded with scalloped lobes and radiating veins. They are variable in size, at 2 to 12 cm wide and 1 to7 cm long. Flowers emerge in clusters, with five notched petals white to pale pink, around 5 mm in length. Fruit is a round capsule approximately 1 cm in diameter, containing between 8 and 12 non-hairy seeds. When ripe, these change colour from green to dark brown. There are several other Malva and related species present in Australia, many of which are also weeds of disturbed sites such as cultivation, gardens, drains and roadsides but less prevalent than marshmallow. These include: Tree mallow, Malva arborea; Musk mallow, Malva moschate; Dwarf mallow, Malva neglecta; Mallow-of-Nice, Malva nicaeensis; Cretan mallow, Malva pseudolavatera; Tall mallow, Malva sylvestris; Spiked malvastrum, Malvastrum americanum; Red-flowered mallow, Modiola caroliniana. - PublicationTime of pruning affects fruit abscission, stem carbohydrates and yield of macadamia(CSIRO Publishing, 2012)
;McFadyen, Lisa Maree ;Robertson, David; ; Macadamia ('Macadamia integrifolia' Maiden and Betche, 'M. tetraphylla' Johnson and hybrids) orchards in Australia are typically hedged around anthesis (September). Such hedging reduces yields, largely through competition for carbohydrates between early fruit set and the post-pruning vegetative flush, but also through a reduction in photosynthetic capacity caused by the loss of canopy. We examined whether hedging at other times might mitigate yield losses. Hedging time was found to affect yields across four cultivars: 'A4', 'A38', '344' and '816'. Yield losses were lower for trees hedged in November-December than for trees hedged in September. Yields for trees hedged in June were higher than for trees hedged in September in one experiment, but were similar in a second experiment. Yield losses for September and October hedging were similar. Hedging time changed the pattern of fluctuations in stem water-soluble carbohydrates (WSC). WSC declined shortly after hedging in September, October or November, and the declines preceded increases in fruit abscission relative to unpruned control trees. The increase in fruit abscission was less pronounced for the trees hedged in November, consistent with the idea that fruit become less sensitive to carbon limitation as they mature.